JP2008091173A - Photoelectric sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric sensor capable of grasping excellently a head part corresponding to a main body part which is changed or adjusted in setting at the time of setting change or adjustment of the detection condition. <P>SOLUTION: An optical fiber sensor unit 1 is constructed as a head separated type photoelectric sensor which is provided with a detection head part 50 and a main body part 31, and irradiates light from a projection part 17 to a detection region through a detection head part 50 and guides the light from the detection region to a receiving part 18 through the detection head part 50. The main body part 31 has a detecting means to carry out detection operation based on a detection condition established beforehand and a condition setting means which can change setting of the detection condition from outside. Furthermore, a visible light emitting means is provided which emits visible light from the head part 50 in a state capable of discriminating from the lighting state of the projection part 17 at the time of detection, when changing setting or adjusting the detection condition by the condition setting means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a photoelectric sensor.

2. Description of the Related Art Conventionally, in the field of photoelectric sensors, so-called head separation type sensors in which a head portion and a main body portion are separated have been provided.
JP 2002-71553 A

  By the way, there are many cases where detection is performed by using a large number of the above-described head-separated sensors, and in this case, the number of head portions increases, so it is difficult to grasp the correspondence between the main body portion and the head portion. Thus, if it becomes difficult to grasp the correspondence between the main body and the head, a problem arises when various setting operations are performed on the main body. For example, since it is difficult to specify which head unit the main body unit to be changed or adjusted corresponds to, it is easy to change the setting of an incorrect main body unit. The operation of tracing from the head to the head portion is required separately, and the setting operation becomes complicated.

  The present invention has been completed based on the above-described circumstances, and when changing or adjusting the detection conditions, the head corresponding to the main body where the setting is changed or adjusted can be grasped well. The purpose is to provide a configuration.

As means for achieving the above object, the invention of claim 1
A detection head unit; and a main body unit, which emits light from the light projecting means for detection to the detection region through the detection head unit, and detects light from the detection region through the detection head unit. A head-separated photoelectric sensor that leads to a light receiving means,
The main body is
Detection means for performing a detection operation based on a preset detection condition;
Condition setting means capable of setting and changing the detection condition from the outside;
Visible light emitting means for emitting visible light from the head unit in a state that can be distinguished from the lighting state of the detection light projecting means in a state where the setting of the detection condition by the condition setting means can be changed,
It is provided with.
Note that the “setting changeable state” means that when the mode is changed to a mode in which the setting can be changed, when the setting changing operation is being performed, or when the mode is changed to a mode in which any adjustment is possible, the adjustment operation (setting change is performed). Including operations that are not accompanied).

The invention of claim 2 is the photoelectric sensor according to claim 1,
The head-separated photoelectric sensor is a fiber sensor,
The detection head unit includes a fiber.

The invention of claim 3 is the photoelectric sensor according to claim 2,
The main body portion accommodates a visible light emitting light projecting element as the visible light emitting means,
The light from the light emitting element for emitting visible light is guided to the detection head unit using the light projecting fiber or the light receiving fiber in common.

Invention of Claim 4 is a photoelectric sensor as described in any one of Claim 1 thru | or 3. The said light projection means for detection is
It emits visible light,
And it is a structure that also serves as the visible light emitting means,
The lighting state of the light projecting means for detection is changed to be distinguishable between when the detection condition setting can be changed and when the detection operation is performed.

Invention of Claim 5 is a photoelectric sensor as described in any one of Claim 1 thru | or 4,
The visible light emitting means performs lighting when the setting of the detection condition can be changed at a timing other than the lighting timing at the detection operation while performing the light projecting operation by the light projecting means for detection,
The detection means does not perform the detection operation at a timing other than the lighting timing at the time of the detection operation.

The invention of claim 6 is the photoelectric sensor according to any one of claims 1 to 5,
The visible light emitting means changes the lighting state of the visible light according to the setting contents of the detection condition.

The invention of claim 7 is the photoelectric sensor according to any one of claims 1 to 6,
The light from the detection light projecting means is configured to be pulsed by the drive means at a set light projection frequency,
The condition setting means is characterized in that the setting can be changed using the projection frequency as the detection condition.

The invention of claim 8 is the photoelectric sensor according to claim 7,
When the projection frequency is changed as the detection condition by the condition setting unit, the visible light emitting unit pulses the visible light at a frequency divided by a predetermined amount of the changed projection frequency. It is characterized by making it.

The invention of claim 9 is the photoelectric sensor according to any one of claims 1 to 8,
The main body includes an operation unit that can be externally operated,
The condition setting means changes the detection condition based on an operation of the operation unit.

The invention of claim 10 is the photoelectric sensor according to any one of claims 1 to 9,
The main body includes communication means for acquiring the detection condition,
The detection condition setting means changes the setting to the detection condition acquired by the communication means when the detection condition changed by the external operation means is for the own device.

The invention of claim 11 is the photoelectric sensor according to any one of claims 1 to 9,
The main body includes a communication means,
When a command signal for enabling a setting change is sent via the communication means, the state shifts to a setting changeable state when the command signal is for the own device.

The invention of claim 12 is the photoelectric sensor according to any one of claims 1 to 11,
Prior to the setting change by the condition setting means, display by the visible light emitting means is performed.

<Invention of Claim 1>
According to the first aspect of the present invention, when the detection condition is changed or adjusted, visible light is emitted from the head unit in a state distinguishable from the lighting state of the detection light projecting means, so that the setting can be changed. The head portion corresponding to the main body portion in the state can be well grasped. Therefore, a work for grasping the correspondence between the main body part and the head part (for example, a work for tracing from the main body part to the head part) can be omitted, and the photoelectric sensor is excellent in workability.

<Invention of Claim 2>
According to the invention of claim 2, since the detection head portion has the fiber, it becomes easy to simplify the head portion.

<Invention of Claim 3>
According to the third aspect of the present invention, the visible light emitting light projecting element can be arranged on the main body side to simplify the configuration of the head part. In addition, the light from the visible light emitting light projecting element Since the fiber or the light receiving fiber is commonly used and guided to the detection head unit, a configuration capable of guiding visible light to the detection head unit can be realized while effectively reducing the number of components.

<Invention of Claim 4>
According to the fourth aspect of the present invention, the detection light projecting means for emitting visible light can be suitably used as the visible light emitting means, so that the number of parts can be effectively reduced.

<Invention of Claim 5>
According to the invention of claim 5, it becomes easy to perform setting while performing the detection operation. In addition, since the lighting timing at the time of setting change and the lighting timing at the detection operation will be clearly different, so that the head part corresponding to the main body part that can be changed based on the timing can be grasped well Become.

<Invention of Claim 6>
According to the sixth aspect of the present invention, it is easy to grasp what the setting condition of the detection condition is based on the lighting mode of visible light.

<Invention of Claim 7>
According to the invention of claim 7, the projection frequency can be set to a desired one, and the head portion and the main body portion can be associated with each other when the setting is changed.

<Invention of Claim 8>
According to the eighth aspect of the present invention, the display frequency can be changed linearly in accordance with the setting change of the projection frequency.

<Invention of Claim 9>
According to invention of Claim 9, it becomes a suitable example which can set a detection condition in a main-body part.

<Invention of Claim 10>
According to invention of Claim 10, it becomes a suitable example which can externally set detection conditions.

<Invention of Claim 11>
According to the eleventh aspect of the present invention, setting change by communication can be performed more easily.
<Invention of Claim 12>
Prior to the invention setting change of claim 12, it is possible to satisfactorily associate the display unit with the visible light.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings.
1. Sensor System First, the entire configuration of a sensor system using the photoelectric sensor according to the present invention will be described with reference to FIGS. In FIG. 1, the direction of arrow A is the forward direction, and the direction of arrow B is the right direction. FIG. 1 is a perspective view illustrating the configuration of a sensor system according to the first embodiment of the present invention, and FIG. 2 is a block diagram of the sensor system according to the first embodiment. FIG. 3 is an explanatory diagram illustrating an arrangement example of the main body portion and the detection head portion.

  1 includes a plurality of optical fiber sensor units 1 (four in FIG. 1) having the same structure (the optical fiber sensor unit 1 corresponds to an example of a photoelectric sensor), and each optical fiber sensor unit. The tip of the optical fiber F led out from 1 is arranged toward the detection region to detect an object to be detected, and the control unit 2 performs monitoring of received light amount and sensitivity adjustment of each sensor unit. It is a thing. The optical fiber sensor unit 1 is also simply referred to as sensor unit 1 below.

  In the following description, when referring to the entire optical fiber sensor unit 1, it is referred to as a sensor unit 1, and when referring to the individual optical fiber sensor units 1, the first sensor from the left optical fiber sensor unit 1 is referred to. These are referred to as unit 1, second sensor unit 1, third sensor unit 1, and fourth sensor unit 1.

  As shown in FIG. 1, the main body 31 of each sensor unit 1 has a box shape, and the tip of the optical fiber F is inserted into a fiber insertion hole provided on the front surface. A cable connector connected from the unit 2 is connected. A light projecting element 12 is provided on the right side surface of the sensor unit 1, and a light receiving element 11 is provided on the left side surface. In addition, a clamping portion (not shown) extending from the lower front and rear portions toward the diagonally lower center is provided.

  The sensor unit 1 is mounted by passing clamping parts on both sides of a known DIN rail 3 so that the light projecting elements 12 and the light receiving elements 11 of the sensor units 1 that are closely adjacent to each other face each other. Yes.

  A box-like control unit 2 and a terminal unit 4 are also arranged on the sides of the first and fourth sensor units 1. The control unit 2 is provided with a clamping part (not shown) having the same shape as the clamping part of the sensor unit 1, and is attached to the clamping part through the DIN rail 3. Further, two screw holes 21 formed so as to penetrate between the upper and lower side surfaces are provided, and a screw 22 screwed into the screw hole 21 is provided. By tightening the screw 22, the clamping portion and the tip of the screw 22 are connected to the DIN rail. 3 can be inserted and fixed to the DIN rail 3. The end unit 4 is also provided with a clamping portion 41, a screw hole 42 and a screw 43, and can be fixed to the DIN rail 3 by tightening the screw 43.

  Here, the light projecting element 23 provided on the right side surface of the control unit 2 is arranged at a position facing the light receiving element 11 of the first sensor unit 1. Further, the light receiving element 44 provided on the left side surface of the termination unit 4 is disposed at a position facing the light projecting element 12 of the fourth sensor unit 1.

Next, the electrical configuration of the sensor system will be described with reference to FIG.
First, a setting operation unit 20 is provided in the housing of the control unit 2, and an operation for inputting an address for specifying a communication partner sensor unit by operating a setting switch provided there is executed by the sensor unit. You can enter a command to power. The switch state of this setting switch is taken in by the CPU 25, where a control signal (transmission signal) is generated and given to the light projecting circuit 26 which constitutes the control unit side transmitting means together with the light projecting element 23. The light projecting circuit 26 supplies a drive current to the light projecting element 23 based on the transmission signal and transmits the transmission signal as light to the first sensor unit 1.

  In each sensor unit 1, the transmission signal received as light by the light receiving element 11 is converted into an analog signal, converted into a digital signal by the light receiving circuit 14, and supplied to the CPU 15.

  The CPU 15 collates the address included in the transmission signal with the address set in itself, and if they are the same, processes the commands sent at the same time. When the address included in the transmission signal is different from the address set to itself, the command is not processed, and the transmission signal is sent to the light projecting circuit 16 as it is. The light is supplied to the optical element 12 and projected.

2. Next, each sensor unit 1 will be described in detail. FIG. 4 is a perspective view schematically illustrating the sensor unit 1, FIG. 5 is a timing chart showing a first modification example of the lighting state, and FIG. 6 is a timing chart showing a second modification example of the lighting state. is there. The sensor unit 1 corresponds to an example of a photoelectric sensor, and includes a detection head unit 50 and a main body unit 31, and a light projecting unit 17 (the light projecting unit 17 corresponds to an example of a detection light projecting unit). The light from the detection region is emitted to the detection region through the detection head unit 50, and the light from the detection region is received through the detection head unit 50 (the light reception unit 18 corresponds to an example of a light receiving unit for detection). It is configured as a head-separated photoelectric sensor leading to

  Each sensor unit 1 projects light from the light projecting unit 17 and irradiates the detection region with light through the optical fiber F1 and the head unit 50, and the light from the detection region is converted into a digital signal by the light receiving unit 18. Then, a detection operation is performed in which the received light amount data is compared with the threshold value installed therein to determine the presence or absence of a detection object. The light projecting unit 17 is configured to project light on the detection target with a set light projecting period. The CUP 15 corresponds to an example of a detection unit that performs a detection operation based on a preset detection condition.

  The light projecting unit 17 provided in the main body 31 is configured by a light projecting element, and the light receiving unit 18 is configured by a light receiving element. Further, the CPU 15 corresponds to a driving unit that drives the light projecting unit 17.

  As shown in FIGS. 3 and 4, the detection head unit 50 includes a light projecting head unit 51 that emits light from the light projecting unit 17 and a light receiving head unit 52 that receives light from the detection region. Become. As shown in FIG. 4, the light projecting head unit 51 is connected at one end side to the main body unit 31 and allows light from the light projecting unit 17 (light projecting element) to enter through the end portion on the one end side. A light projecting fiber F1 that emits light toward the detection region from the end on the side, and the light receiving head unit 52 is connected to the main body 31 on one end side, and receives light from the detection region from the end on the other end side And a light receiving fiber F2 that is guided to one end and incident on the light receiving portion 18 (light receiving element).

  In such a configuration, the main body 31 can be set to change the detection condition from the outside, and the head unit can be distinguished from the lighting state of the light projecting unit 17 when the detection condition is changed or adjusted. Visible light emitting means for emitting visible light from The CPU 15 corresponds to an example of condition setting means.

  The light projecting unit 17 emits visible light and also serves as a visible light emitting unit. The lighting state of the light projecting unit 17 can be identified when the detection condition is changed and when the detection operation is performed. Changed to Specifically, when the lighting timing at the time of detection is as shown in pattern 1 in FIG. 5, an integer K (K = 2 in FIG. 5, refer to the timing at the time of setting) set in advance in the lighting cycle T1 at the time of detection. The multiplied value KT1 can be used as the lighting cycle when the setting is changed. If it does in this way, it can be set as the display mode which is always visually recognized at the time of lighting, or the display mode which repeats blinking very quickly, and can be set as the display mode which repeats blinking slowly at the time of setting change.

  That is, in this embodiment, the light from the light projecting unit 17 is configured to be pulse-lit by the CPU 15 (the CPU 15 corresponds to an example of a driving unit) at a set light projecting frequency, which is a condition setting unit. The CPU 15 can change the setting using the projection frequency as a detection condition. When the projection frequency is changed by the CPU 15 as a detection condition, the visible light from the visible light emitting means is pulsed at a frequency obtained by dividing the changed projection frequency by a predetermined amount. For example, when lighting is repeated at the period T1 at the time of detection as described above, a frequency-divided frequency is set so that the period becomes KT1, and lighting is repeated at the period KT1.

  When the setting is changed to the cycle T2 as in the pattern 2 (when the projection frequency is changed to 1 / T2), the light is turned on at the cycle T2 longer than that in the pattern 1 at the time of detection. In this case, when the setting is changed, the frequency is divided in the same manner as in the pattern 1, and the lighting is repeated in the cycle KT2. The same applies when the setting is changed to a longer cycle T3 as in pattern 3. In this configuration, since the period at the time of setting change is extended as much as the period at the time of detection is extended, the lighting mode of visible light can be changed corresponding to the degree of the detection condition.

  In the present embodiment, the main body unit 31 includes the operation unit 19 that can be operated externally, and the CPU 15 that is a condition setting unit changes the detection condition as described above based on the operation of the operation unit 19. . For example, the light projection frequency as described above can be input from the operation unit 19, and lighting is performed at the time of the frequency division (that is, the timing of the period KT1) as described above. It has become.

  Further, the change of the display mode at the time of setting change is not limited to the above-described frequency division method, but may be as shown in FIG. In the example of FIG. 6, when the period T1 is set, the display control is performed at the timing as in the pattern 4 when the setting is changed, and when the period T2 is set, the timing as in the pattern 5 is set at the period T3. When set, the timing is set as in pattern 5. Note that the period T4 is longer than the periods T1 to T3.

  In addition, since the main-body part 31 is provided with the light receiving element 11, the light receiving circuit 14, and CPU15 as a communication means, you may acquire detection conditions via this communication means. That is, the detection condition changed is acquired from an external operation means (for example, the operation unit 20 of the control unit 2) capable of changing the detection condition, and the CPU 15 (detection condition setting means) If the detection condition changed in (1) is for the own device (for example, the acquired information includes address information indicating the own device together with the detection condition), the setting is changed to the acquired detection condition. You may do it.

  The detection condition setting by the external operation means is not limited to such a method. For example, a setting tool such as a handy console is connected to the main body 31 and the detection condition is input from the setting tool. There may be.

  Further, processing for grasping the detection head unit may be performed prior to setting change or adjustment from the external operation means. For example, prior to changing or adjusting the settings, any one of the optical fiber sensor units 1 can be designated and operated by the operation unit 20 (external operation means), and when such designation is made, Address information and command information are transmitted. On the optical fiber sensor unit 1 side, visible light is emitted from the detection head unit 50 when a designation signal for designating the own device is sent from the outside. In this way, before the setting change or adjustment of the detection condition, the main body unit 31 and the head unit can be grasped in association with each other. As a comparative example for the present invention, for example, there is an amplifier built-in sensor in which an amplifier is incorporated in a detection head. When such a plurality of amplifier-separated sensors are connected to the sequencer, it is possible to identify the sensor related to the setting change by performing a unique display from the detection head.

  As described above, according to the present embodiment, the visible light emitting unit that emits visible light from the head unit in a state distinguishable from the lighting state of the light projecting unit 17 when the detection condition is changed or adjusted. I have. According to this configuration, when changing or adjusting the setting of the detection condition, visible light is emitted from the head unit in a state that can be distinguished from the lighting state of the light projecting unit 17, so the setting is changed or adjusted. The head portion corresponding to the main body portion 31 can be grasped well. Therefore, the work for grasping the correspondence between the main body 31 and the head (for example, the work of tracing from the main body 31 to the head) can be omitted, and the photoelectric sensor is excellent in workability.

  Further, since both the light projecting element as the light projecting part 17 and the light receiving element as the light receiving means for detection are provided in the main body part 31, the head part can be simplified. Can be satisfactorily associated with each other.

  The light projecting unit 17 emits visible light and also serves as a visible light emitting unit. The lighting state of the light projecting unit 17 is changed when the detection condition is changed and when the detection operation is performed. Is changed to be identifiable. Therefore, since the light projecting unit 17 that emits visible light can be suitably used as the visible light emitting means, the number of components can be effectively reduced.

  The visible light emitting means changes the lighting state of visible light in correspondence with the degree of detection conditions. In this way, it is possible to grasp the degree of the detection condition based on the lighting mode of visible light.

  In addition, the light from the light projecting unit 17 is configured to be pulse-lit by the driving unit at the set light projecting frequency, and the condition setting unit can change the setting using the light projecting frequency as a detection condition. Therefore, the projection frequency can be set to a desired one, and the head unit and the main body unit 31 can be associated with each other when the setting is changed.

  In addition, when the projection frequency is changed as a detection condition by the condition setting unit, the control unit pulses the visible light from the visible light emitting unit at a frequency divided by a predetermined amount of the changed projection frequency. Let In this way, the display frequency can be changed linearly in accordance with the setting change of the projection frequency.

  The main body 31 includes an operation unit that can be externally operated, and the condition setting unit changes the detection condition based on the operation of the operation unit. Therefore, this is a preferred example in which the detection condition can be set by the main body 31.

  Further, the main body 31 includes a communication unit that acquires a detection condition changed from an external operation unit capable of changing the detection condition, and the detection condition setting unit automatically detects the detection condition changed by the external operation unit. This is a preferable example in which the detection condition for changing the setting to the detection condition acquired by the communication means can be set externally.

  Further, the visible light emitting means emits visible light from the head unit when a designation signal designating the own device is sent from the outside. In this way, before the setting change or adjustment of the detection condition, the main body unit 31 and the head unit can be grasped in association with each other.

<Embodiment 2>
FIG. 7 is a perspective view illustrating an optical fiber sensor unit according to the second embodiment. In FIG. 7, a visible light emitting light projecting element 70 made of an LED or the like is accommodated in the main body 31, and the light from the visible light emitting light projecting element 70 is shared by using the light projecting fiber F <b> 1. It is guided to the tip end side of the portion 50. However, the present invention is not limited thereto, and for example, the light from the visible light emitting light projecting element 70 may be guided to the distal end side of the light receiving head portion 52 by using the light receiving fiber F2 in common. When the setting is changed, visible light that can be distinguished from the lighting state of the light projecting unit 17 at the time of detection is emitted from the visible light emitting light projecting element 70.

<Embodiment 3>
FIG. 8 is a perspective view illustrating an optical fiber sensor unit according to the third embodiment. FIG. 8 shows an example in which a visible light emitting light projecting element 70 is disposed at the tip of the detection head unit 50 (specifically, the light projecting head unit 51). When the setting is changed, visible light that can be distinguished from the lighting state of the light projecting unit 17 at the time of detection is emitted from the visible light emitting light projecting element 70. The visible light emitting light projecting element 70 may be provided not on the light projecting head unit 51 side but on the front end side of the light receiving head unit 52.

<Embodiment 4>
FIG. 9 is a perspective view illustrating a photoelectric sensor (an amplifier-separated photoelectric sensor) according to the fourth embodiment. In this configuration, the light projecting unit 17 serving as a detection light projecting unit is disposed on the front end side of the light projecting head unit 51, and the light receiving unit 18 serving as a light receiving detection unit is disposed on the front end side of the light receiving head unit 52. Is arranged. Here, as in the first embodiment, the detection light projecting means also serves as a visible light emitting means. The method for enabling the display of the detection light projecting means to be identified at the time of detection and at the time of setting change or adjustment is the same as in the first embodiment.

<Embodiment 5>
FIG. 10 is a perspective view illustrating a photoelectric sensor (an amplifier-separated photoelectric sensor) according to the fifth embodiment. Also in this configuration, the light projecting unit 17 serving as a detection light projecting unit is arranged on the front end side of the light projecting head unit 51, and the light receiving unit 18 serving as a light receiving detection unit is disposed on the front end side of the light receiving head unit 52. Further, a visible light emitting light projecting element 70 is disposed on the front end side of the light projecting head unit 50.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  In the above-described embodiment, the visible light emitting unit emits visible light through the light projecting head unit. However, the visible light emitting unit may emit visible light through the light receiving head unit.

  Further, the visible light emitting means performs lighting when the detection condition setting is changed at a timing other than the lighting timing during the detection operation, and the detecting means does not perform the detection operation at a timing other than the lighting timing during the detection operation. It may be. Since the lighting timing at the time of the setting change and the lighting timing at the time of the detection operation are clearly different, the head portion corresponding to the main body portion 31 that has been changed or adjusted based on the timing can be grasped well. Become.

  Although the head separation type fiber sensor in which the detection head unit and the main body unit are connected by a fiber is illustrated as the above embodiment, the fiber sensor may not be used. For example, a head-separated sensor in which the detection head unit and the main body unit are connected by an electric wire may be used.

The perspective view which illustrates the composition of the sensor system concerning Embodiment 1 of the present invention. 1 is a block diagram of a sensor system according to a first embodiment. Explanatory drawing which shows the example of arrangement | positioning of a main-body part and a detection head part. A perspective view conceptually illustrating an optical fiber sensor unit Timing chart showing lighting example change 1 Timing chart showing lighting example change 2 FIG. 6 is a perspective view illustrating an optical fiber sensor unit according to the second embodiment. FIG. 9 is a perspective view illustrating an optical fiber sensor unit according to the third embodiment. The perspective view which illustrates the optical fiber sensor unit concerning Embodiment 4. FIG. 9 is a perspective view illustrating an optical fiber sensor unit according to the fifth embodiment.

Explanation of symbols

1. Optical fiber sensor unit (photoelectric sensor)
15 ... CPU (detection means, condition setting means, communication means)
17 ... Projection section (projection element, detection projection means, visible light emission means)
18. Light receiving part (light receiving element, light receiving means for detection)
19 ... operation part 20 ... operation part (external operation means)
31 ... Main body 50 ... Detection head F1 ... Light projecting fiber F2 ... Light receiving fiber

Claims (12)

A detection head unit; and a main body unit, which emits light from the light projecting means for detection to the detection region through the detection head unit, and detects light from the detection region through the detection head unit. A head-separated photoelectric sensor that leads to a light receiving means,
The main body is
Detection means for performing a detection operation based on a preset detection condition;
Condition setting means capable of setting and changing the detection condition from the outside;
Visible light emitting means for emitting visible light from the head unit in a state that can be distinguished from the lighting state of the detection light projecting means in a state where the setting of the detection condition by the condition setting means can be changed,
A photoelectric sensor comprising: The head-separated photoelectric sensor is a fiber sensor,
The photoelectric sensor according to claim 1, wherein the detection head unit includes a fiber. The main body portion accommodates a visible light emitting light projecting element as the visible light emitting means,
The photoelectric sensor according to claim 2, wherein light from the visible light emitting light projecting element is guided to the detection head unit using a light projecting fiber or a light receiving fiber in common. The detection light projecting means includes
It emits visible light,
And it is a structure that also serves as the visible light emitting means,
4. The lighting state of the detection light projecting means is changed to be distinguishable between when the detection condition setting can be changed and when the detection operation is performed. The photoelectric sensor according to item. The visible light emitting means performs lighting when the setting of the detection condition can be changed at a timing other than the lighting timing at the detection operation while performing the light projecting operation by the light projecting means for detection,
5. The photoelectric sensor according to claim 1, wherein the detection unit does not perform the detection operation at a timing other than a lighting timing at the time of the detection operation.   The photoelectric sensor according to claim 1, wherein the visible light emitting unit changes a lighting mode of the visible light according to a setting content of the detection condition. The light from the detection light projecting means is configured to be pulsed by the drive means at a set light projection frequency,
7. The photoelectric sensor according to claim 1, wherein the condition setting unit is configured to change the setting of the projection frequency as the detection condition.   When the projection frequency is changed as the detection condition by the condition setting unit, the visible light emitting unit pulses the visible light at a frequency divided by a predetermined amount of the changed projection frequency. The photoelectric sensor according to claim 7, wherein: The main body includes an operation unit that can be externally operated,
The photoelectric sensor according to claim 1, wherein the condition setting unit changes the detection condition based on an operation of the operation unit. The main body includes communication means for acquiring the detection condition,
The detection condition setting unit changes the setting to the detection condition acquired by the communication unit when the detection condition changed by the external operation unit is for the own device. The photoelectric sensor as described in any one of Claims 1 thru | or 9. The main body includes a communication means,
When a command signal for enabling a setting change is sent via the communication means, the state shifts to a setting changeable state if the command signal is for the own device. The photoelectric sensor as described in any one of Claim 1 thru | or 9.   12. The photoelectric sensor according to claim 1, wherein display is performed by the visible light emitting unit prior to setting change by the condition setting unit.

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