UTC System Handbook - Siemens

System Handbook for an STC UTC System 666/HE/16940/000
Data Transmission section 4.12
Plan Compliance section 7.13
SCOOT Detector section 8.8
Other on-street equipment section 8.9
4.8 Fault Category Groups
The System allows the fault categories given in 16.21Appendix C - to be gathered
together in groups. The fault categories contained within a group may be specified in
either an inclusive or exclusive way. Fault category groups are identified by four digit
numbers. Fault category group numbers may be used in fault llisting commands.
4.8.1 Fault Recognition
The System looks for the faults described in the following sections by checking
the equipment's status of the following:
(1) Reply data provided by the data transmission system is analysed for its own
faults plus plan compliance, controller and SCOOT detector faults
(2) Status data associated with computer terminals and disc drives is analysed
(3) A status word set up by the System's own software is monitored to show its
correct operation.
4.8.2 System Response to Faults
The detection of each new fault of all types gives rise to the following actions:
(1) The fault is recorded in the current fault log. This contains the faults that are
currently outstanding for each piece of equipment and may be easily examined by
an operator;
(2) If a suitable alarm or indication panel is included in the System, the audible
and visual alarms are activated. For terminals with status lines, see section 5.1.6,
these are also updated;
(3) A fault message is output on terminals that are configured to receive fault
reports and also written to the System Log, section 4.13;
(4) If the fault applies to on-street equipment then depending on the fault
category it may be isolated;
(5) If a fault on one item of on-street equipment causes isolation of or otherwise
affects other on-street equipment in the same TCC then these items are also
isolated and this action reported (known as a Link List).
The monitoring of faults is arranged in a hierarchical order such that the detection
of a fault does not cause other, consequent, fault conditions to be reported.
Once a fault has been detected and logged the same fault is not reported again on
the equipment unless cleared in the meantime.
666-HE-16940-000.doc Issue 31 Page 22