Input disconnection detection

What does 88  H mean?

A disconnection has been detected on an input terminal. This indicates a physical break in the wiring or loss of signal from the connected input device, preventing proper signal reception by the I/O module.

• Physical disconnection of an input line or cable.
• Faulty input device failing to provide a signal.
• Loose or damaged terminal connection at the input module or sensor.

Click steps to track your progress.

1. 1

   Recover the connection to the input terminal by re-securing wiring or replacing the faulty input device.

2. 2

   After connection recovery, turn 'Alarm clear request' (Y11) on and off to clear the alarm.

3. 3

   Verify that 'Input disconnection detection status' reads 0 (Normal) and 'Alarm flag' (X11) turns off after clearing.