Characteristics of the centralized control unit used in the dam area of ​​the power plant:

(1) RSTEC serial communication is carried out by using CONTEC industrial computer and PLC in each dam area, and there is a conversion interface between RS232 and RS422 in the industrial computer and PLC in each dam area;

(2) The communication mode between the industrial computer and the upper computer is through the interface between the A network and the B network of the high-speed Ethernet network, which transmits data fast, has high reliability, and has channel redundancy standby;

(3) Each dam area PLC has a corresponding communication process on the industrial computer to process the data;

(4) The data collected by the industrial computer is to transmit data by sharing the real-time database on the network, and the industrial computer establishes contact with the real-time database by mapping the collected data;

(5) The operation and monitoring screens of each gate are provided on the industrial computer and the upper computer. The gates of the dam area can be opened, closed and suspended in the central control room and the dam area control room. The flood discharge hole is also required to be opened in the remote control until With any opening, you can monitor the opening of each gate and various fault signals. The operation and monitoring of each gate are placed on their respective screens;

(6) The host computer can record and print the signal displacement of each gate, the on/off condition of the channel, and the operation event of the gate;

(7) Each gate increases the local and remote position status points. When it is in the local position, the dam area PLC only accepts the local control operation. When it is in the remote position, the dam area PLC only accepts the remote control command regardless of the local location. The operation of the gate controls the position of the handle;

(8) The control of each gate by the industrial computer is opened for 5 seconds.

Communication between industrial computer and gate PLC:

(1) An interface data area for communication with the industrial computer is provided inside each gate PLC, and the opening, opening and analog data of the two sides are handed over here, so that the communication between the PLC and the industrial computer does not affect the control program of the original PLC;

(2) The communication protocol between the industrial computer and the dam area PLC is the PLC communication protocol of MITSUBISHI;

(3) Data transmission format: RS232C standard, asynchronous two-way (not simultaneous);

(4) Communication rate: 9600 bps;

(5) Transferred characters: Both communication parties must convert the communication content into ASCII characters for transmission, including 1 start bit, 7 data bits, 1 parity check bit, and 1 stop bit;

(6) Character parity: even parity;

(7) Data transmission result correctness verification method: and verification;

(8) Before the industrial computer and PLC communicate, the industrial computer can send an ENQ code with code 05H to the PLC to check whether the channel is intact. If the PLC receives this code correctly, it will return a 06H ACK to the IPC; if the code cannot be understood due to interference, the return code is 15H NAK; if the physical channel is not available, the IPC will receive Not returning results until waiting for timeout;

(9) The process of the industrial computer collecting data (reading) from the PLC: the industrial computer sends a read command with the character /00 to the PLC, and the 03HPLC responds to the read command of the industrial computer to transmit the data to be read to the industrial computer, if the PLC cannot understand Read command, or presence and verification error, simply return a NAK with code 15H to the industrial computer;

(10) The process in which the industrial computer sends a control command (write number) to the PLC: the industrial computer sends a write command with an 00 to the PLC. If the PLC finds that the write command of the industrial computer is correct, and the corresponding data has been successfully written. , return an ACK with the code 06H to the industrial computer; if the PLC cannot understand the write command, or the presence and verification error, return a NAK with the code 15H to the industrial computer; if the industrial computer reads or writes to the PLC If it is unsuccessful, the IPC will retry the same process 3 times.

Customization Gas Cylinder Transportation Frame

Customization Gas Cylinder Transportation Frame,Gas Cylinder Transportation Frame,Guard Ring For Gas Tanks,Warehouse Storage For Gas Cylinder

Hangzhou Fuyang Hexing Machinery Co. ltd , https://www.gascylindercap.com