JPH02116903A - Input/output address allocating system for programmable controller - Google Patents

Abstract

PURPOSE:To execute a satisfactory address allocation by registering a free slot whose extension is scheduled and the number of extension schedule points and referring to them, in a programmable controller of a building block type. CONSTITUTION:When SP for showing an extension schedule against free slots 03-05, etc. whose extension is scheduled, a 1-word portion of a word container of the number of extension schedule points or a 2-word portion 01W, 02W, etc. are written in parentheses symbols of the respective set column such as slot numbers 00-07, etc. against UNIT 1, while observing a CRT screen by using a programming device with a CRT screen, they are registered in a register in a CPU. When this registration is referred to, a continuous address is allocated by putting close the free slot, and when the free slot is recognized to be a slot whose extension is scheduled, the continuous address is allocated by containing the free slot. Accordingly, even at the time of providing the free slot, it does not occur that the address is continued and a nonuse address is used erroneously, and even at the time of extension, it is unnecessary to change the address and a satisfactory address allocation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in an input/output address allocation method in a building block type programmable controller.

(Prior art) Conventionally, the input/output address assignment method in this type of building block type programmable controller was to fill up empty slots for each output point of the input/output card installed in each slot on the unit board. Consecutive addresses are assigned in slot order.

According to this input/output address allocation method,
When multiple input/output cards are installed on a unit board, even if empty slots must be provided between adjacent input/output cards due to poor socket connections, etc. Since the numbers are consecutive, there is an advantage that programming errors such as creating a user program by erroneously using unused input/output addresses are less likely to occur.

(Problem to be Solved by the Invention) However, in such a conventional input/output address allocation method, if an empty slot is provided in advance for expansion, and an expansion card is later installed in it, the expansion In the input/output cards installed after the user card, the input/output addresses are shifted one after another, and as a result, there is a problem in that the input/output addresses in the user program have to be changed significantly.

This invention was made in view of the above problems,
The purpose of this is to allow you to ignore empty slots and allocate consecutive addresses if you are forced to create an empty slot due to a socket connection failure, etc., while also securing an empty slot for future expansion. in case of,
It is an object of the present invention to provide an input/output address allocation method that does not require any changes to the existing user program even when the expansion card is installed.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the first invention of this application provides a system for each input/output point of an input/output card installed in each slot on a unit board. In contrast, in an input/output address allocation method for a programmable controller in which consecutive addresses are allocated in slot order by filling up empty slots, there is provided a means for registering empty slots scheduled for expansion and the number of points planned for expansion, and The present invention is characterized by comprising means for allocating an address to a planned expansion point for an empty slot whose schedule has been registered.

The object of the second invention of this application is to fill empty slots with respect to each input/output point of the input/output card installed in each slot on the unit board, in order to achieve the above object. In an input/output address allocation method for a programmable controller in which consecutive addresses are allocated in order of slots with the top address of the unit as the allocation start address, means for registering the allocation start address on the unit board, and a means for registering the allocation start address on the unit board; The present invention is characterized by comprising means for allocating consecutive addresses in slot order from the allocation start address to each input/output point by filling up empty slots.

(Function) According to the first invention, when an expansion plan is not registered for empty slots, empty slots are filled for each input/output point of the input/output card installed in each slot on the unit board. It is possible to allocate consecutive addresses in the order of the slots.On the other hand, if an expansion plan is registered for an empty slot, for the empty slot 1- for which the expansion plan has been registered, an address can also be assigned to that expansion planned point. Can be assigned.

Therefore, if it is necessary to create an empty slot due to a connection failure, etc., by not registering an expansion plan for the empty slot, input/output addresses can be assigned continuously while ignoring the empty slot. On the other hand, when creating an empty slot for an expansion plan, by registering the expansion plan for that empty slot and assigning an address to the expansion plan point, the expansion card can be installed later. Even if this happens, there is no need to change the input/output addresses in the user program.

Further, according to the second invention, when the start address is not registered for allocation on the unit board, empty slots are allocated for each input/output point of the input/output card installed in each slot on the unit board. Continuous addresses are allocated in slot order with the first address of the unit as the allocation start address, but if the allocation start address on the unit board is registered, each input/output is assigned from the registered allocation start address. Consecutive addresses are assigned to the points in slot order, filling in empty slots.

Therefore, if an empty slot must be created due to a socket connection failure, etc., by not registering the allocation start address on the unit board, the empty slot will be ignored and the first address of the unit will be used as the allocation start address. While continuous addresses can be assigned, if you want to create an empty slot for future expansion plans, you can set the empty slot at the beginning of the uniboard and register the next slot as the allocation start address. Even if an expansion card is subsequently installed, there is no need to change the input/output addresses on the user program.

(Example) FIG. 1 is a front view schematically showing the appearance of a building block type programmable controller to which the present invention is applied.

As shown in the figure, this programmable controller includes two units, UNITO and UNITI.

UNITO is the central processing unit (CPU) in the system.
), the unit boat Niha S
Five slots, LOTOO-SLOTO4 colors, are provided.

A digital input card DI or a digital output card Do can be attached to each of these slots.

UNITl is a unit for input/output expansion in the system, and the unit board has 5LOTOO-8.
There are 8 (1) (ot) consisting of LOTO7.

A digital input card D2 or a digital output card Do can also be inserted into these slots.

Note that a maximum of 2 words, that is, 32 addresses can be allocated to each of the 5 LOTs of UNITO and UNITl.

These two units UN ITO and UN ITI are
Connected by cable.

As is well known, the UNITO CPU is mainly composed of a microprocessor, a system ROM, a work RAM, a single output RAM, and the like.

Then, the microprocessor operates according to the system program, first reading input data from the digital input card DI of UN ITO and UN ITl, writing it to a predetermined area of the input/output RAM, and then inputting it to the input/output R.
A user program consisting of a ladder diagram etc. is executed with reference to the input data in the AM, the result is written to the output canister in the input/output RAM, and then the output data of the input/output RAM is sent to the digital output card D of UNITO and UNITI.

While repeating the above operations, system service processing such as rewriting the user program and monitoring is executed.

In the system service process, processes such as rewriting the user program and monitoring the execution state of the user program are performed based on commands from a programming device with a CRT screen (not shown).

This completes the explanation of the general configuration and operation of this type of programmable controller, and then provides a detailed explanation of the input/output address allocation method, which is the main part of the present invention.

FIGS. 2 and 3 are explanatory diagrams each showing an example of a screen when input/output address allocation according to the present invention is performed using the aforementioned programming device with a CRT screen.

Figure 2 shows an example of a screen for creating an input/output setting table, which will be described later.
On the screen are UN ITO and UN ITl, 5LoTOO~5LoT04.5LOTOO-8
A setting column [ ] is displayed corresponding to LOTO7.

By writing the predetermined code and numerical value in this setting field [ ] using the keyboard, you can check the input/output of the card to be installed in each 5 LOT, the existence of expansion space, the number of words of each card, etc. This makes it possible to register an input/output setting table, which will be described later.

That is, X indicates input, Y indicates output, and SP indicates expansion space, and the numerical value and W following these codes indicate the number of words.

For example, an input card with a capacity of one word is attached to UNITO's 5LOTOO, and an output card with a capacity of two words is attached to 5LOTO1.

Mata, UN I T 1 (7) S L O T O
Cards with a capacity of 3 Ni and 1 Word are planned to be added in the future, and similarly, cards with a capacity of 2 Word are planned to be added to 5LOTO5 in the future.

After performing a predetermined write operation in this way, if a predetermined registration operation is performed, an input/output setting table, which will be described later, is automatically registered.

FIG. 3 is an explanatory diagram showing an example of a screen for registering the allocation start input/output address for each UNIT.

As shown in the figure, UNITO is displayed on the CRT screen.
, UNITl, an allocation start address setting field [] is displayed, and by writing the allocation start address using the word number in this setting 111 [], it is possible to register the allocation start address for each UNIT. is being done.

For example, in the case of UNITO, nothing is written in the setting column [], so the first address of the relevant tJNITO becomes the allocation start address, and for IJNITI, word number 010 is written in the setting column []. Therefore, address allocation starts from the 10th word.

Note that the word number here corresponds to the word address of the input/output RAM, as shown in FIG.

That is, FIG. 4 is a memory map showing the contents of the input/output RAM, and areas from word number 0 to word number 20 are shown.

Here, the contents of each word are shown in Figure 5, where 81 is an identification bit for batch input/output prohibition/permission, B2 is an input/output physical address offset, and B3 is an input/output identification bit. It is.

Next, FIG. 6 is a flowchart schematically showing only the input/output address allocation process related to the present invention among the various programs built in the system ROM of the CPU section. The operation of the system of this embodiment will be systematically explained with reference to .

In addition, in the following explanation, UllTO, UNITl
It is assumed that the digital input card DI or the digital output card Do is installed as shown in FIG. 1, and the input/output setting table is It is assumed that it is registered.

When the program is started in this state, the contents of the input/output setting table are first read (step 6).
o1), if there is a registration indicating the input/output card (
Step 602: YES>, it is further determined whether the unit has a head register designation, that is, whether or not an allocation start address is designated (step 603).

Here, as shown in FIG. 3, word number 10 is set for UNITI as the first register designation (step 603 YES), so in this case, UNITI
5 LOTOO is 10 of the input/output RAM shown in Figure 4.
Input/output address allocation is performed starting from the word word (step 604).

Furthermore, as shown in Figure 2, 5 LOT of UNITl
Since 03-5 LOTO5 have empty slot designations (step 605 YES), word numbers 14-17 of the input/output RAM are secured as expansion spaces (step 606), as shown in FIG.

In this way, the updating process of the input/output allocation address, that is, setting the allocation start address (step 604), and the address registration in the input/output allocation table, that is, securing the space for expansion (step 606), are performed, and other UNITs (not shown) When similar processing is completed for YES in steps 607 and 608), input/output address allocation processing is completed.

Then, corresponding to the screens shown in FIGS. 2 and 3, word numbers 5 to 5 are stored in the input/output RAM as shown in FIG.
The expansion space corresponding to word number 9 and the expansion space corresponding to word numbers 14 to 17 are secured, and from then on, the expansion cards corresponding to UNITO SL○TO3 and 04 shown in Fig. 1 are installed, and the LIN ITl 5LOTO3~
If an expansion card is installed in the 5LOTO5, a user program corresponding to the expansion card can be executed without making any changes to the existing user program.

In the screens shown in Figures 2 and 3, if nothing is written to the setting W@[], the input/output addresses will be assigned in the same way as the conventional general assignment method, that is, the input/output addresses will be assigned on the unit board. Consecutive addresses are assigned to each input/output point of the input/output card attached to each of the 5 LOTs in the order of the 5 LOTs, filling up the 5 vacant LOTs.

According to the above embodiment, by using the code SP on the screen shown in FIG. 2, an empty slot for expansion can be secured, and on the screen shown in FIG. Input/output allocation start address RA
By setting the word numbers REG and No of M, an empty slot for expansion can be secured at the beginning of the unit board.

When expansion cards are actually installed in these slots, there will be no shift in the input/output numbers for cards installed in subsequent slots, and as a result, the user program up to that point will not be changed at all. The user program corresponding to the expansion card can be executed without any trouble.

[Effects of the Invention] As is clear from the above explanation, according to the first invention of this application, when the expansion plan is not registered for empty slots, the input/output installed in each slot on the unit board Continuous addresses can be assigned to each input/output point of the card in the order of the slots by filling up the empty slots.On the other hand, if an expansion plan is registered for the empty slot, the empty slot for which the expansion plan is registered can also assign addresses to the planned expansion points.

Therefore, if it is necessary to create an empty slot due to a connection failure, etc., by not registering an expansion plan for the empty slot, input/output addresses can be assigned continuously while ignoring the empty slot. On the other hand, when creating an empty slot for an expansion plan, by registering the expansion plan for that empty slot and assigning an address to the expansion plan point, the expansion card can be installed later. Even if this is done, the effect is that there is no need to change the input/output addresses in the user program up to that point.

Further, according to the second invention of this application, when the start address is not registered for allocation on the unit board, for each input/output point of the input/output card installed in each slot on the unit board, Consecutive addresses are allocated in slot order by filling up empty slots with the first address of the unit as the allocation start address, but if the allocation start address on the unit board is registered, the allocation starts from the registered allocation start address. Consecutive addresses are assigned to each input/output point in the order of the slots, filling in empty slots.

Therefore, if an empty slot must be created due to a socket connection failure, etc., by not registering the allocation start address on the unit board, the empty slot will be ignored and the first address of the unit will be used as the allocation start address. While continuous addresses can be assigned, if you want to create an empty slot for future expansion plans, you can set the empty slot at the beginning of the uniboard and register the next slot as the allocation start address. Even if an expansion card is subsequently installed, there is no need to change the input/output addresses on the user program.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing the appearance of a building block type programmable controller to which the present invention is applied; FIGS. 2 and 3 are explanatory diagrams showing an example of a screen for registering an input/output setting table, respectively; Fig. 4 is a memory map showing the contents of the input/output RAM with space for expansion, Fig. 5 is a memory map showing the contents of each word of the input/output RAM, and Fig. 6 is a memory map showing the contents of each word of the input/output RAM. 2 is a flowchart schematically showing only a portion of the input/output address allocation processing according to the present invention. UNITO...Central processing unit unit UNIT1.
...Input/output expansion unit 5LOT...Slot DI...Digital input card Do...Digital output card

Claims (2)

[Claims] (1) In a programmable controller input/output address assignment method in which continuous addresses are assigned to each input/output point of the input/output card installed in each slot on the unit board in the order of the slots by filling up empty slots. Means for registering vacant slots scheduled for expansion and the number of points planned for expansion thereof; and means for allocating addresses also to points for expansion for the vacant slots for which expansion plans are registered. Features a programmable controller input/output address allocation method. (2) Continuous addresses are assigned to each input/output point of the input/output card installed in each slot on the unit board in the order of the slots, with the first address of the unit as the assignment start address, by filling up the empty slots. In an input/output address allocation method of a programmable controller, means for registering an allocation start address on the unit board, and a means for registering an allocation start address on the unit board, and a means for registering an allocation start address on the unit board, and a means for registering an allocation start address from the registered allocation start address to each input/output point in slot order by filling up empty slots. An input/output address allocation method for a programmable controller, comprising means for allocating consecutive addresses.