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Siemens EH.85M.21E Manual de usuario Pagina 4

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ST800 Guidance Notes
Page 4 667/HB/27000/100 Issue 1
The following diagram shows the connections in the power connector on the back of
the main processor card. Any signal name proceded with an exclamation mark (‘!’) is
active-low, i.e. 0v is the active state. The values in brackets, e.g. (24v), show the
normal voltages expected on the plug in order that it can be checked.
Main Processor Card
Rear Power Connector
10v
5v
CPU
9
20v
5v
CPU
10
30v
5v
ESB
11
4
24v
Det
5v
ESB
12
5
0v
Det
!Rel/A
(24v)
13
6
!SSR
(24v)
!Rel/B
(24v)
14
7
!Dim
(24v)
Low
Batt
15
8
!P/Fail
(5v)
P/Fail
(0v)
16
CPU Card
→
Main Processor LED’s
There are four LED’s on the front of the main processor card.
The top one is green and is labelled ‘PP’ for power present. This LED will flash
giving a heartbeat indication that the firmware is running normally.
If it does not illuminate, then there is no power to the main processor card. Check
that controller is powered and that the power connector is inserted into the back of
the processor card.
The other three LED's are red and identify various fault conditions.
The top red LED is labelled ‘SE’ for system error. This will illuminate during the
power-up sequence and then will normally be extinguished when the controller is
running normally with no faults present in its fault log.
The middle red LED is labelled ‘BE’ for bus error. This LED should only illuminate if
the processor has problems executing the firmware, e.g. when the firmware PROM
is missing.
The bottom red LED is labelled ‘WD’ for watchdog. This LED will be illuminated
when the hardware watchdog circuit times-out. Note that when the firmware detects
a serious fault, it will extinguish the lights and stop ‘kicking’ the hardware watchdog
deliberately so that it times-out and also keeps the lights off.
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