PLC serial communication timeout?
Last modified by Jim on 2022/12/17 11:01
1. Check the communication parameter, including boad rate, station id, stop bit, data bit, check mode.
2. The program is written incorrectly, or an unknown device is read or written, please check the program.
3. If the communication device can read and write normally, but this error still occurs, it may be caused by multiple write operations at the same time. user can solve it by using modbuspoll, below is demo program:
https://ftp.we-con.com.cn/Download/WIKI/LX5V%20PLC/demo/%E3%80%90PLC-5V%E3%80%91Modbus%20Polling.zip