System Overview >>>

The process of the monitoring system is that the road center sends commands to the main control through the MODBUS TCP protocol and monitors the status of field devices. The main control receives the command from the road center and forwards the commands to the remote station through the MODBUS TCP protocol. With the positive hole control, the main control of the fan control starts and stops the positive hole lighting and starts and stops the fan through the MODBUS TCP protocol. The remote station receives the main control instruction and starts and stops the rescue tunnel lighting and fan through MODBUS TCP protocol.

1. The monitoring system consists of three layers of network structure: centralized control center, tunnel monitoring center and on-site monitoring terminal.

2. Single rescue tunnel hardware architecture

NA-PLC products mainly complete the data collection work of the tunnel monitoring center and on-site monitoring terminal. Among them, the tunnel monitoring center uses the NA400 medium and large PLC to complete, and uses the hot standby redundant system solution to achieve power supply redundancy, CPU redundancyand network redundancy to ensure the safety and reliability of data collection. The on-site monitoring terminal mainly adopts the small integrated controller of NA200H series integrated Ethernet interface. The NA200H system controller integrates an Ethernet interface, multiple RS485 interfaces, and rich I/O interfaces. The site now has ground-level data collection and control work, and completes data exchange through the fiber optic ring network and NA400 PLC.

3. Monitoring system

The configuration screen of the system was developed by Sichuan Kuanggu Information Engineering Co., Ltd. The system screen is as follows:

4. Site environment diagram

This project is designed and implemented by Sichuan Kuanggu Information Engineering Co., Ltd. The product adopts NA-PLC

System function design >>>

The host computer uses the configuration software to compile the corresponding program to realize the monitoring and display of the field equipment. The system control methods are mainly automatic manual, automatic centralized control and manual operation.

①Automatic manual is to use the mouse to start\stop a single controllable device;

②Manual operation uses the button on the on-site control box to start\stop a single controllable device;

③Automatic centralized control is to start, run, stop and run the entire control system automatic operation and online monitoring of the entire process such as fault alarm and protection shutdown during the process.

NA400PLC software design 

The software design of the program control system uses a ladder diagram, and adopts a modular design method to divide the functions that the entire control system needs to complete into several modules, and then design them separately. The advantage of this is that the design is convenient and it is easy to modify the program, making the procedure is clear and organized.

①Automatic centralized control function module design

②Automatic manual function module design

③Analog processing module design

④Communication module design with upper computer

⑤Alarm module design

Configuration software design

The configuration software is developed by Sichuan Kuanggu Information Engineering Co., Ltd., which mainly has the following parts.

①Monitoring screen making

②Parameter configuration screen making

③Alarm screen making

④Building database

⑤Real-time trend graph and historical trend graph