Siemens ST950 Handbook page 41

Figure 13 – Intelligent Detector Backplane (rear view)
4.8.1 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 0 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 Software Run LED
(LP3)
Off
Red
Off
Off
Off
Off
Off
* - May flash so fast that it looks like Green Steady.
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Copyright © Siemens Mobility Limited 2018. All Rights Reserved.
GSPI comms
OUT to next Address
IDB Switch
Comms Active LED
(LP2)
Yellow
Yellow
Green Steady
Green Flash
Green Flash
Receipt of Message*
Green / Red
Alternating
(As above depending
Red Flash
Unrestricted
5
Neil Atkinson
ST950 ICM Handbook
Sopers Lane, Poole, Dorset, BH17 7ER
GSPI comms
IN from
Processsor or
previous IDB
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
State
(LP1)
Yellow Processor Reset
Yellow Watchdog Failure
Off Performing Start Up
Red Awaiting Start
Green Toggle on
Communications Active
Off Invalid Address
Major Fault Detected
on state)
Page
Status
Date
Document No.
Intelligent Traffic Systems
41 of 125
Issued
18-Dec-2018
667/HE/46950/000