AB PLC communication issue
Thread Content
The brothers at AB are using an L36REM PLC on site, but the communication stops working after the PLC is powered off and then turned back on. It’s not possible to ping the PLC’s IP address from the server in the control room, but pinging the server’s IP address from the touch screen on site works fine, as does pinging the PLC’s IP address. What’s going on here? The server and the PLC are not in the same IP range, but their subnet masks are the same
Personally, I think it’s better to check the communication cable first
Could you be more specific? Please explain your network setup
Does the on-site screen communicate using coaxial cable? Is there a HUB or some other device in the communication path of the central controller? I’ve encountered this problem before; it was resolved by removing the hub in between, although the hub itself was fine. Using a HUB to describe the device in the middle might not be very accurate, but I remember it was something from Phoenix; it’s been too long and I’ve forgotten.