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Siemens ST950 - Intelligent Detector Backplane Card Leds

Siemens ST950
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Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Security classification
Unrestricted
Page
54 of 154
Version
7
Status
Issued
Last Editor
manpreet.jeerh
Date
January 2020
Document Name
ST950 ICM Handbook
Document No.
667/HE/45950/000
GSPI comms
OUT to next
IDB
GSPI comms
IN from
Processsor or
previous IDB
Address
Switch
Input 24V DC- /AC
Input 24V DC+ /AC
Output 24V DC- /AC
Output 24V DC+ /AC
Twist and Flat Ribbon
Cable to Loop
Termination Board
Figure 23 Intelligent Detector Backplane (rear view)
4.11.1 Intelligent Detector Backplane Card LEDs
The Intelligent Detector Backplane Card has three tri-colour status LEDs which are
identical to the LEDs on the I/O card as described in section 4.9.1 above. It should
be noted that these LEDs are viewed from above and are seen in reverse order (i.e.
LP3, LP2 and LP1 from left to right). For this reason, the table below shows the
LEDs in the order they are seen.
Watchdog LED
(LP3)
Software Run LED
(LP2)
Comms Active LED
(LP1)
State
Off
Yellow
Yellow
Processor Reset
Red
Yellow
Yellow
Watchdog Failure
Off
Green Steady
Off
Performing Start Up
Off
Green Flash
Red
Awaiting Start
Off
Green Flash
Green Toggle on
Receipt of Message*
Communications
Active

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