JPH0350604A - Multi-sequence controller - Google Patents

Abstract

PURPOSE:To attain multi sequence control without a private interface module by providing an input/output means and a bus expansion means for an output module and providing a bidirectional buffer and a bus mediation means for the bus expansion means. CONSTITUTION:When the PLC (programmable logic controller) module A2 of a basic unit 1 accesses the input/output module of a basic unit 3, the bus mediation means 33 of an expansion module 20 sets an address buffer 31 and a transceiver 34 in the direction of the unit 3 from the unit 1. At that time, the bus mediation means 33 sets the buffer 31 and the transceiver 34 in the direction of the unit 3 from the unit 1 in the expansion module 22 of the unit 3. The means 33 mediates a bus with the module 9 and makes the buffer 31 and a data buffer 32 active. If the module 8 sets data in an output module 50, the data can be read through the input/output means 15 when the module 9 reads data.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sequence control device in which a CPU module and an input/output module are connected via a system bus.

2. Description of the Related Art In recent years, the control range of sequence control devices has expanded from small to large. An example of a conventional sequence control device will be described below with reference to the drawings.

FIG. 5 is a system configuration diagram of a conventional sequence control device, and FIG. 4 is a block diagram of an output module. In FIG. 4, 10 is an output module, 11
12 is a data buffer, 13 is a data latch, and 14 is an output circuit. In FIG. 5, 1 is a basic unit A, which consists of a PLC (programmable logic controller) module A8 and an input/output module group 23a. Reference numeral 2 denotes an expansion unit consisting of an input/output module group 23c. 3 is the basic unit B. Reference numeral 5 denotes an expansion connector that connects the basic unit A1 and the expansion unit 2 with an expansion cable 6. 100 is a sequence control device A. 101 is a sequence control device B. The two sets of sequence control devices, the sequence control device A100 and the sequence control device B101, are connected by a cable 7 between the input/output modules 24, 26, 25, and 22.

Regarding the sequence control device configured as above,
The operation will be explained below. First, in the sequence control device A100, the bus of the PLC module A8 is connected to the expansion unit 2 through the expansion connector 5 and expansion cable 6. Therefore PLC module A8
accesses both the input/output module group installed in the basic unit Al and the input/output module group installed in the expansion unit 2. Similarly, in the sequence control device B101, the PLC module B9 accesses both the input/output module group mounted in the basic unit B3 and the input/output module group 23b mounted in the expansion unit B.

Sequence control device A100 and sequence control device B1
01 signals are exchanged between the output module 24 of the PLC module A8 installed in the expansion unit 2 of the sequence control device A100 connected by the cable 7 and the PLC module B9 installed in the basic unit B2 of the sequence control device B101. input module 26 and PLC module A8 input module 25 and PLC
This is done between the module B9 and the output module 22.

Problem to be Solved by the Invention However, in the above configuration, a dedicated interface module 24, 25, 2 is used between sequence control devices.
6.22 is required and a time delay occurs during access.

In view of the above problems, the present invention provides a multi-sequence control device that can be controlled without a dedicated interface module because the output module of one sequence control device can be used as an input for the other sequence control device.

Means for Solving the Problems In order to solve the above-mentioned problems, the multi-sequence control device of the present invention includes: an output module equipped with an input means capable of monitoring output data; a bus expansion means for connecting other sequencer units; The multi-CP, wherein the bus expansion means includes a bidirectional buffer and a bus arbitration means.
This is related to the U sequence control device.

Function: With the above-described configuration, the output module of one sequence control device can be used as an input module of the other sequence control device, so data can be sent and received between multiple sequencers without a dedicated interface module. This makes sequence control possible.

Embodiment Hereinafter, a multi-sequence control device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of a multi-sequence control device in this embodiment. FIG. 2 is a block diagram of the output module. FIG. 3 is a block diagram of the expansion module. In FIG. 1, 1 is a basic unit A, and 3 is a basic unit B.

8 is a PLC module A that controls the input/output module 23a and the output module 50. 9 is a PLC module B which controls the input/output module 51. 2
0 and 22 are expansion modules and expansion cables 21
connected with. In FIG. 2, numeral 10 is an output module of the people output module, which has a configuration in which 15 input means are added to the conventional example shown in FIG. The expansion module 20.22 shown in FIG. 3 includes an address buffer 31, a data buffer 32. Transceiver-3
4 and bus arbitration means 33.

The operation of the multi-sequence control device configured as described above will be explained below with reference to FIGS. 1, 2, and 3. First, in FIG. 1, basic unit A1 and basic unit B3 are expansion module 20 and expansion module 2.
2 and an expansion cable 21.

That is, when the PLC module A8 of the basic unit A1 accesses the input/output module of the basic unit B3, the bus arbitration means 33 of the expansion module 20 sets the address buffer 31 and the transceiver 34 in the direction from the basic unit A1 to the basic unit B3. At this time, in the expansion module 22 of the basic unit B3, the bus arbitration means 3
3 sets the address buffer 31 and transceiver 34 in the direction from the basic unit A1 to the basic unit B3. Here, the bus arbitration means 33 performs bus arbitration with the PLC module B9 to activate the address buffer 31 and the data buffer 32. Now PLC module A8
has set data in the output module 50, when the PLC module B9 reads the data,
Data set in the output module 50 can be read via the input means 15. Next, the PLC module B9 sets data in the input/output module 51.

When reading the data to the PLC module 88, the data set in the input/output module 51 is
5 can be read out. As described above, according to this embodiment, the output module is provided with an input means capable of monitoring output data, and is provided with a bus expansion means for connecting other sequencer units, and the bus expansion means includes a bidirectional buffer and a bus arbitration means. This eliminates the need for dedicated interface registers between multiple PLC modules.
Data can also be sent and received in real time. The same applies when configuring an expansion unit.

Effects of the Invention As described above, the present invention provides an output module with an input means capable of monitoring output data, a bus extension means for connecting another sequencer unit, and the bus extension means includes a bidirectional buffer and a bus arbitration means. This eliminates the need for a dedicated interface register between PLC modules in a multi-sequence control device.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a multi-sequence control device according to an embodiment of the present invention, FIG. 2 is a block diagram of an output module, FIG. 3 is a block diagram of an expansion module, and FIG.
The figure is a block diagram of a conventional output module, and FIG. 5 is a sequence configuration diagram of a conventional multi-sequence control device. 10...Output module, 15...Input means, 20...Extension module, 22...
...Expansion module, 31...Address buffer, 32...Data buffer, 33...
... bus arbitration means, 34 ... transceiver.

Claims (1)

[Claims] In a sequence control device that transmits and receives data via a bus, the output module is equipped with an input means that can monitor output data, and the bus expansion means connects another sequencer unit, and the bus expansion means includes a bidirectional buffer and a bus. A multi-sequence control device comprising: arbitration means.