Bit_Bucket_07
Member
A friend of mine inquired about an intermittent problem that he is seeing in his plant in which discrete inputs in 2 remote IO chassis are blinking off and causing nuisance equipment shutdowns. The system uses a single source of 120 VAC control power at each remote location. He has installed a power monitor and determined that the control power is not dropping out when these shutdowns occur.
The PLC equipment is ControlLogix. A 1756-L62 CPU Revision 15.4 with 1756-EBNT/A modules for Ethernet IP distributed IO. They are using N-TRON switches for their IO network. Is it possible that a faulty Ethernet switch or some other intermittent network fault could be the cause of the blinking inputs? He said that he has seen no faults reported when he checks properties for the processor or the EBNT modules.
The PLC equipment is ControlLogix. A 1756-L62 CPU Revision 15.4 with 1756-EBNT/A modules for Ethernet IP distributed IO. They are using N-TRON switches for their IO network. Is it possible that a faulty Ethernet switch or some other intermittent network fault could be the cause of the blinking inputs? He said that he has seen no faults reported when he checks properties for the processor or the EBNT modules.