DE9309070U1 - Assembly for an electrical device - Google Patents

Description

G 33 06 EN

Siemens AG

Assembly for an electrical device 5

The present invention relates to an assembly for a modular electrical device, in particular for a modular programmable logic controller,

- whereby the module can be connected to a bus via at least one interface with bus contacts, via which the modules can be connected to one another,

- the bus contacts comprise at least two supply contacts for connecting the module to supply potentials and at least one clock, data and control contact each for transmitting a clock, data and control signal .

When operating such a bus, the problem often arises that bus contacts arranged close to one another disrupt communication between the modules due to crosstalk. The invention is therefore intended to solve the problem of making communication between the modules as secure as possible.

The object is achieved in that the bus contacts are arranged in a single row, with at least one supply contact being arranged between the at least one clock contact, the at least one data contact and the at least one control contact.

If the interface has several control contacts, the crosstalk between the control contacts can be minimized by essentially arranging at least one supply contact between each control contact.

93 G 3 3 O 6 EN

However, if at least one of two adjacent control contacts rarely changes its signal level, there is no need for a supply contact between these two control contacts.
5

Communication is even more secure if the interface has additional contacts for an additional bus, whereby the additional contacts and the bus contacts are arranged in groups. This means that in the event of a bus interruption, minimal communication can be maintained via the additional bus.
be maintained.

The crosstalk between the bus and the additional bus is minimal if the bus contact adjacent to the additional bus is designed as a supply contact.

Advantageous embodiments emerge from the following description. They show:

0 FIG 1 a block diagram of a programmable logic

Control and
FIG 2 shows the pin assignment of a module.

According to FIG 1, the programmable logic controller consists of a central unit 1 and peripheral modules 2, which are connected to one another via essentially U-shaped connectors 3. Adjacent connectors 3
are electrically connected to one another, as indicated by dashed lines in FIG 1. Furthermore, a controller 4 is connected to the bus in each of the modules 1. This enables the central unit 1 to communicate with the modules 2.

According to FIG 2, each module 2 has two interfaces 5, 5'. The bus system by which the modules 1, 2 are connected to each other consists of one interface 5, 5'
of 14 contacts. The following contact arrangement is particularly advantageous:

93 G 3 3 O 6 EN

The ground contacts 6, 6 ¹ and the supply contacts 7, 7' serve to supply power to the modules 2 via the central unit 1. The output signals which the modules 2 supply to an externally controlled technical process - as indicated by the arrow in FIG. 1 - can be blocked by means of the control contacts 8, 8'. The control signal transmitted via the control contacts 8, 8' does not normally change.

Furthermore, each interface 5, 5' has four control contacts up to 12, 9' up to 12' for transmitting control signals. The control contacts 9, 9' are required to report a command transmission from the central unit 1 to the modules 2 to the modules 2. Similarly, a data transmission from the central unit 1 to the modules 2 is reported via the control contacts 10, 10'. The command or data transmission itself takes place via the data contacts 14, 14', whereby the data transmission is clocked according to the clock signal transmitted via the clock contacts 13, 13'.

The modules 2 use the control contacts 11, 11' to report proper data or command transmission to the central unit 1. The control contacts 12, 12' are used to report events from the peripheral modules 2 to the central unit 1.

The bottom two contacts 15, 15' form an independent bus system that can be operated independently of the other bus contacts 6 to 14, 6' to 14'. 30

Claims (5)

93 G 3 3 O 6 Protection claims 1. Assembly for an electrical device with a modular structure consisting of at least two assemblies, in particular for a modular programmable logic controller, - wherein the assembly (2) can be connected to a bus via at least one interface (5,5') with bus contacts (6-14,6'-14 '), via which the assemblies (2) can be connected to one another, - wherein the bus contacts (6-14,6'-14') comprise at least two supply contacts (6,6 ',1,1') for connecting the module (2) to supply potentials and at least one clock (13,13'), data (14,14') and control contact (8-12,8'-12 ') each for transmitting a clock, data and control signal, - wherein the bus contacts (6-14,6'-14') are arranged in a single row, - whereby at least one supply contact (6,6',7,V) is arranged between the clock (13,13'), the data (14,14') and the control contact (8-12,8'-12') to minimize the crosstalk behavior. 2. Assembly according to claim 1, characterized in that the interface (5,5') has several control contacts (8-12,8'-12') and that in order to minimize the crosstalk behavior, at least one supply contact (6,6',7,7') is arranged essentially between the control contacts (8-12,8'-12'). 0 3. Assembly according to claim 2, characterized in that, if no supply contact (6,6',7,7') is arranged between two control contacts (8-10,8'-10'), at least one (8,8') of the control contacts (8-10,8'-10') changes its signal level only rarely. 4. Assembly according to claim 1, 2 or 3, characterized in that the interface 93 G 3 3 O 6 OE (5,5') has additional contacts (15,15') for an additional bus, wherein the additional contacts (15,15') and the bus contacts (6-14,6'-14 ') are arranged in groups. 5. Module according to claim 4, characterized in that the bus contact (6,6') adjacent to the additional bus is designed as a supply contact.