Displaying faults in discrete TBX modules
(Original Document)
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Description
The following table shows the operation of the display lamps for the TBX distributed I/O modules.
Lamps
Lit
Flashing
Off
I/O
(red)
External fault:
  • short-circuit on outputs,
  • open circuit on inputs, if wiring check module,
  • sensor/preactuator voltage failure.
-
No external fault.
Channel 0 to 15
(red)
Channel is active
Wire fault on the wiring check modules: open circuit (indicated by flashing lamp) or short-circuit (indicated by inverted flashing lamp).
Channel is inactive.
Remedial actions
The following table describes the remedial actions to be taken when faults are indicated.
Lamps
Lit
Flashing
Off
I/O
(red)
Check the cabling.
-
-
Channel 0 to 15
(red)
-
  • check the tightness of the terminals,
  • check the sensor or the preactuator.
-