I saw someone asking this connection question. Just the hand screen and PLC have, considering that the RS485 communication port integrated by Siemens 200SMART body does not support PPI protocol, first program the PLC communication port to support the MODBUS protocol free port, and then connect the screen.
1. The PLC program downloads and runs the following program (200SMART PLC communication port address 3, baud rate 9600, even parity)
2. The screen configuration connection is as follows (using the standard Modicon MODBUS-RTU protocol, the screen COM2 port is set to 9600, 8, even, 1)
3. Connect screen COM2 and PLC PORT 0. After downloading the configuration program, the screen and PLC cannot be connected. However, using the serial port software to connect to the PLC can communicate (send standard format MODBUS-RTU message, PLC has a response), indicating that there is no problem in initializing the PLC communication port. It is now suspected that the Kunlun state of the touch screen can connect 200SMART in this way. Is there a case like this?
Serial port software has response message
Note: The 200SMART PLC and the Kunlun state-of-the-art screen have been successfully connected using Ethernet.
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