Class 'A' Abnormal; Channel Failure Abnormal; Channel Initialization Abnormal - Simplex 4100 Series Manual

1.1.2.3.1

Class 'A' Abnormal

Description:
The addressable loop or RUI Bus has an open circuit.
Possible causes:
Open circuit in the wiring loop

 Bad connection at addressable point (on addressable loop faults).
 Bad connection at remote transponder or LCD Annunciator (for RUI Bus faults)
Faulty addressable loop or RUI card

- Check this fault by „looping out‟ the A and B terminals on the RUI/Mapnet/IDNet card to clear
the fault. If fault does not clear then card may be faulty
1.1.2.3.2

Channel Failure Abnormal

Description:
The Loop card cannot communicate with any device on the loop. Be aware all devices associated with this
loop will indicate a „Normal‟ state to prevent multiple faults per display.
Possible causes:
 The Loop has a Short circuit
 The Loop has an Earth fault
 The Loop is not connected or incorrectly connected
1.1.2.3.3

Channel Initialization Abnormal

Description:
This fault typically occurs at startup with IDNet loops and will normally clear after a couple of minutes if a lot
of Isolators are fitted.
Possible causes:
If the fault continually re-appears the loop length maybe too long or too noisy – Contact your local

Simplex® branch for assistance
 Possible bad device causing communication errors
- Disconnect devices at half way points until the fault clears to locate the faulty device
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