JPH0595590A - Slave station supervisory and controlling system - Google Patents

Abstract

PURPOSE:To provide the slave station supervisory and controlling system which unnecessitates the increase of a control relay output part even when the number of COM lines at a slave station is increased. CONSTITUTION:This slave station supervisory and controlling system equipped with common control lines parallelly spread from a master station A to respective slave stations B and plural supervisory lines individually spread to the plural slave stations B is provided with one control relay part 6 at each slave station B so as to transmit control information transmitted from the master station A to controlled system equipments, and this control relay output part 6 is equipped with a COM line switching control part 5 to switch the COM lines corresponding to the controlled system equipments of various control relay outputs according to control items. Further, the master station A is equipped with a COM line control information preparation part 7 to add switching information to the control information so as to switch the COM line corresponding to the controlled system equipment of the control relay output at the designated slave station B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slave station monitor and control system, and more particularly to a slave station monitor and control system having a 1: N configuration.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example. In the conventional example shown in FIG. 2, the control information of the master station A is transmitted from the control information transmitter 51 through the device control information generator 58 to each slave station B through the control line. In each corresponding slave station B, the control information receiving section 53 receives this information and outputs it as control information to the outside through the device control information detecting section 59 via the control relay output section 56 for each COM line. In this case, the control relay output units 56 corresponding to the number of COM lines corresponding to the control device are required.

The monitoring information is transmitted from the monitoring information transmitting section 54 of each slave station B to the master station A via each monitoring line.
In the master station A, each monitor information receiving section 52 receives, stores it in the monitor information receiving section 52 of each slave station, and outputs it as a monitoring item to the outside.

[0004]

In such a conventional monitoring / controlling apparatus, a CO corresponding to a device to be controlled is set for each slave station.
Since it is necessary to provide control relay output sections for the number of M lines, there is a drawback that the size cannot be reduced when the number of COM lines is large.

[0005]

It is an object of the present invention to provide a slave station monitoring and control system which improves the inconvenience of the conventional example, and in particular, does not require an additional control relay output section even if the number of COM lines of the slave station increases. The purpose is to do.

[0006]

According to the present invention, a master station and a plurality of slave stations are provided, and a common control line laid in parallel from the master station to each slave station and a plurality of slave stations are provided. In a slave station monitoring control system including a plurality of individually installed monitoring lines, each slave station is provided with one control relay output unit for sending out control information sent from the master station to a control target device. Along with this control relay output section, a COM line switching control section for switching COM lines corresponding to control target devices having different control relay outputs depending on control items is also provided. The configuration is such that a COM line control information creation unit that adds switching information for switching the COM line corresponding to the control target device to the control information is provided. This aims to achieve the above-mentioned object.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The embodiment shown in FIG. 1 includes a master station A and a plurality of slave stations B, a common control line laid in parallel from the master station A to each slave station B, and a plurality of slave stations B individually. And a plurality of monitoring lines laid in the. In each slave station B,
A control relay output unit 6 for sending the control information sent from the master station A to the controlled device is provided. This control relay output unit 6 is provided with a COM line switching control unit 5 that switches COM lines corresponding to control target devices having different control relay outputs depending on control items.
Further, the master station A is equipped with a COM line control information creation section 7 that adds switching information for switching the COM line corresponding to the control target device of the control relay output of the designated slave station B to the control information.

Based on the above configuration, the master station A fixedly uses a part of the control items of the control information exchanged with each slave station, and controls the equipment to be controlled by the control relay output of each slave station. The function to add the information for switching the COM line to the slave station and send it to the slave station, and the function to constantly monitor the switching status of the COM line corresponding to the control target device of the control relay output by the monitoring information from each slave station. In addition, each slave station B has a function of switching the COM line corresponding to the control target device of the control relay output according to the control item of the control information from the master station A, and the control target device of the control relay output of its own station. The switching status of the COM line is exchanged with the master station A, and a part of the monitoring items of the monitoring information is fixedly used and constantly transmitted.

Then, the control information of the master station A is separately input to the COM line control information creating section 7 and the device control information creating section 8. Of these, the control information input to the COM line control information creating unit 7 is processed as COM line switching control information, and together with the control information from the device control information creating unit 8, the control information transmitting unit 1 sends a control line to each slave station B. To send via. In each corresponding slave station B, the control information receiving unit 3 receives this information, and the device control information detecting unit 9 receives the COM information.
It is output to the line switching control unit 5 and the outside as control information via the control relay output unit 6. In this case, the COM line corresponding to the control device is input to the COM line switching control unit 5 and the COM line is controlled according to the control information of the device control information detection unit 9.
The line is switch-controlled and supplied to the control relay output unit 6.

Further, the COM line switching state and the monitor information are transmitted from the monitor information transmitting section 4 of each slave station B to the master station A through each monitor line. The parent station A receives the information by the individual monitoring information receiving section 2, stores it in the monitoring information receiving section 2 of each child station, and outputs it to the outside as a monitoring item.

[0011]

As described above, according to the present invention, since each slave station has the COM line switching control function corresponding to the controlled device, the control relay output units corresponding to the number of COM lines corresponding to the controlled device are provided. Since it is unnecessary, it is possible to provide an unprecedented excellent slave station monitoring and control system that can be downsized even when the number of target COM lines is large.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

 A master station B slave station 1 control information transmitter 2 monitoring information receiver 3 control information receiver 4 monitoring information transmitter 5 COM line switching controller 6 control relay output unit 7 COM line control information generator 8 equipment control information generator 9 Device control information detector

Claims (1)

[Claims] 1. A common control line comprising a master station and a plurality of slave stations, which are laid in parallel from the master station to each slave station, and a plurality of monitoring lines which are individually laid for the slave stations. In a slave station monitoring and control system equipped with, each slave station is provided with one control relay output section for sending out control information sent from the master station to the control target device, and this control relay output section is provided with A COM line switching control unit for switching COM lines corresponding to control target devices having different control relay outputs is also provided. In addition, the master station is equipped with a COM line control information creation unit that adds switching information for switching the COM line corresponding to the control target device of the control relay output of the specified slave station to the control information. Supervisory control system.