Hello Everyone, I am new to this chat and I have encountered a major issue on a system we are building. We have a master PLC Micrologix 1400 and several VFDs that are the slaves. Our comms are working just fine, but one of our tests is that in the event of a device failure and loss of comms we would alarm out the specific device, provide an HMI alarm and continue to ping that device until comms are restored.
As a test with the system running we pull the modbus connector to the device, and we do get the alarm for that specific device BUT additionally we get alarms to several of the other devices. The other devices are still connected to the daisy chain and will communicate but every now and then it will error the message.
Any ideas would be highly appreciated, this thing is driving us crazy but I am sure I am not the only one trying to provide a fail safe system that if one device fails, it locks out and the rest continue to operate.
Thank you
As a test with the system running we pull the modbus connector to the device, and we do get the alarm for that specific device BUT additionally we get alarms to several of the other devices. The other devices are still connected to the daisy chain and will communicate but every now and then it will error the message.
Any ideas would be highly appreciated, this thing is driving us crazy but I am sure I am not the only one trying to provide a fail safe system that if one device fails, it locks out and the rest continue to operate.
Thank you