Siemens ST950 Plus+ - Page 65

ST950 Plus+ User Manual
ST950 Plus+ User Manual
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667/HE/53000/000
Issue 2
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3.16.14 CIC/CTB Status LEDs
The status LEDs provide an engineer with some information on the correct operation of the CIC.
The CIC has six LEDs (three per CPU) which are used to indicate various conditions as follows;
LED
Illumination
Function
LP1x – (Green)
System/Software
Run
Slow Flash
Software is operating normally (typically flashing once per
second)
Off
CIC has detected a persistent fatal error and has entered a non-
operational state to prevent continual restarts. This state can only
be left by power cycling the CIC (with Comms LED off and Fault
LED illuminated).
LP2x – (Red)
Fault
Off
Normal Operation
On
Fault Detected
LP3A – (Green)
Communications
On
Normal Operation.
Off
No relevant messages received in the last second (implies loss of
communications), or low power mode.
LP3B – (Green)
Communications
On
Normal Operation.
Off
No relevant messages received in the last second (implies loss of
communications), or low power mode.
Table 11 : CIC LED Status Indicators
Indication of Fault
Conditions other than those identified above should not occur and so can be treated as faults.