POTENTIAL OPERATING ISSUES
Part. No. 2400M2501_6 Touchpoint Pro
158 Technical Handbook
19 Ring Communication Errors
Ring communication is controlled by the CCB and has redundancy, which means that a single communication fault will not
jeopardise the whole system. The system shows the failure position, as illustrated in the fault cases described below.
Note: Any situation that prevents correct CCB operation may also prevent correct ring operation. Resolve any CCB
problems before troubleshooting ring operation.
Ring faults may occur for two reasons: either due to a faulty module or due to ring bus electrical/wiring faults.
19.1 Module Faults
Modules are designed to periodically self-test and will shut down if they detect a fault or suffer a catastrophic failure, and
they will stop communicating on the ring circuit. This will typically be reported as a ring fault in addition to a module fault.
In the event of a module shut-down, modules either side of the faulty module will divert communication from the primary
circuit (Ring A) to the secondary circuit (Ring B), and will report Ring faults. In addition, all commissioned channels on the
faulty module will report a channel fault. The remaining modules and channels will continue to work correctly.
The table extract below is from an actual event log and it shows that Module M23 has failed.
Table 46. Example of a Ring Fault Event Log
The table above indicates that Module M23 to the Ring is causing Ring Communication Errors and that the Ring circuits are
broken between Modules M22 and M24. The event display would be similar if the faulty module is the first or last module on
the Ring, but it might also indicate a ring fault between the module and the CCB.
Note: Channels associated with a faulty module will also be reported as faulty, but these events may be ignored as the
parent module has shut-down and is unable communicate any channel data.
19.2 Troubleshooting Module Faults First Response
If a Module Fault is reported, you may first try removing and then refitting the affected module to see if this clears the fault, or
you can try doing a full system power cycle. Be aware, though, that an apparent fix may be temporary and the fault may
recur if the module itself has a transient fault.
Note: All Ring failures should be investigated to avoid unplanned recurrences.
A ring communication error or fault warning could signify the loss of communication with number of sensors
connected to the affected module(s). Always consider putting in place alternative safety arrangements while the fault
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