Honeywell Touchpoint Pro Technical Handbook page 169

POTENTIAL OPERATING ISSUES
19.4.5 Ring Fault Type 5
Rationale:
If a Module fails both ring networks are interrupted but fail 'safe'. In the example above Module 3 will loop back the data from
Ring B onto Ring A and Module 1 will loop back the data from Ring A onto Ring B, causing the CCB to tell the UI to show a
fault message for both 'Ring : Module 1' and 'Ring : Module 3'.
Investigation:
First check the circuit between these two module locations. Also check the empty slots on the DIN rail between these
locations.
If these checks are Ok, replace the suspect module, reconfigure and retest the system.
19.4.6 Ring Fault Type 6
Rationale:
If a Ring A circuit is faulty (e.g. before Module 1), then Module 1 will not receive A-in and will loop back the data from Ring B
onto Ring A, and the CCB and will tell the UI to show a fault message for 'Ring A : Module 1'.
Investigation:
Check the Ring A circuit (e.g. RCM A-out to M1 A-in) before the notified module.
19.4.7 Ring Fault Type 7
Rationale:
If a Ring B circuit is faulty (e.g. before the CCB), then the CCB will not receive B-in and it will tell the UI to show a fault
message for 'Ring B fault before CCB'.
Investigation:
Check the Ring B circuit from the first module to the CCB.
Part. No. 2400M2501_6
Figure 102. Ring Fault Type 5
Figure 103. Ring Fault Type 6
Figure 104. Ring Fault Type 7
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Touchpoint Pro
Technical Handbook