Signal Faults - Allen-Bradley 1719 Ex I/O User Manual

Appendix A Troubleshooting

Signal Faults

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See the following table for the recommended actions when troubleshooting
signal faults.
Recommended Action for Signal Faults
Error
Faulty signal
All signals for a module are faulty
The output module switches off
Input module sporadically
delivers no measured values
Measured values occasionally
incorrect
I/O module reported to be faulty
Rockwell Automation Publication 1719-UM001C-EN-E - August 2018
Remedy
• Check if there is a short circuit or lead breakage within the circuit.
• Check that the field devices and sensors are working properly.
• Check the communication path to the I/O module.
• If necessary, replace the I/O module.
• Check that the power supply is working properly.
• Check the bus connection.
Communication with the adapter is interrupted.
• Check that the I/O module is plugged into the backplane properly.
Communication with the adapter is interrupted.
• Check that the I/O module is plugged into the backplane properly.
• Check whether the measured value is being distorted by external influences.
• Check that the shielding is intact.
• Check that the correct I/O module is plugged in.
• Check that the green LED on the I/O module is lit and that the I/O module is
correctly plugged in.