We have a PLC Siemens S7 300 CPU 315 DP, using NT631C-V2 Omron HMI via Siemens HMI Adapter. Now having problems with its HMI that can not connect to the PLC, already I check the serial cable between the HMI and HMI Adapter and no problems. Please help from the experts what causes the HMI and PLC can not connect, thanks.
Connection between Omron HMI and Siemens PLC Broken
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