Hi I was sent to site to look at a fault
The PLC had a 6ES7 331-7Kf02-2AB0 fitted. All the internal square blocks on the card were set to 'C' and the hardware set to 4DMU
The HMI display for the input was showing #######
I removed the cable and used my simulator to read 3.99mA on the field wiring. I injected 4-20mA (source mode) and the HMI display worked fine. I reconnected the cables, ####### displayed.
I connected a pair from a different analog input (approx 6mA, worked fine.
I hooked up meter in series with the plc input, monitored the PIW (PIW moved to DBW xx) and found that with the wire disconnected it showed -32767 and with the 4mA connected it was showing over range of 32767
Any ideas, i have never seen this behaviour before
The PLC had a 6ES7 331-7Kf02-2AB0 fitted. All the internal square blocks on the card were set to 'C' and the hardware set to 4DMU
The HMI display for the input was showing #######
I removed the cable and used my simulator to read 3.99mA on the field wiring. I injected 4-20mA (source mode) and the HMI display worked fine. I reconnected the cables, ####### displayed.
I connected a pair from a different analog input (approx 6mA, worked fine.
I hooked up meter in series with the plc input, monitored the PIW (PIW moved to DBW xx) and found that with the wire disconnected it showed -32767 and with the 4mA connected it was showing over range of 32767
Any ideas, i have never seen this behaviour before