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Issue 5 - September 2006
Page 46 of 65
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ESD
Network 006 - Analogue Alarm Monitoring and Logic Input
Scan Rate 00030ms
Label 03001 Enabled
00920
>
R0500
>
00900
4500
LOW
LOW
ALARM
PALL0001A
4500
LOW
LOW
ALARM
PALL0001A
13936
PI0001A
ANALOGUE
FAULT
PI0001A-FLT
5000
PALL0001A
LOGIC
INPUT
WorkingDis5000
00920
>
R0501
>
00900
4501
LOW
LOW
ALARM
PALL0001B
4501
LOW
LOW
ALARM
PALL0001B
13937
PI0001B
ANALOGUE
FAULT
PI0001B-FLT
5002
PALL0001B
LOGIC
INPUT
WorkingDis5002
03800
>
R0500
>
03780
5500
HIGH
HIGH
ALARM
PAHH0001A
13936
PI0001A
ANALOGUE
FAULT
PI0001A-FLT
5500
HIGH
HIGH
ALARM
PAHH0001A
5001
PAHH0001A
LOGIC
INPUT
WorkingDis5001
03800
>
R0501
>
03780
5501
HIGH
HIGH
ALARM
PAHH0001B
13937
PI0001B
ANALOGUE
FAULT
PI0001B-FLT
5501
HIGH
HIGH
ALARM
PAHH0001B
5003
PAHH0001B
LOGIC
INPUT
WorkingDis5003
If safety critical analogue inputs are used, the alarm logic generated must be include fail safe logic.
This is Mandatory. A number of methods are available to generate fail safe digital logic inputs from analogue
inputs, an example utilising the USR3 Analogue test package is given above (The values used are those
given in the default Analogue test configuration),
The example above is for a single channel with both high 3800 and low 900 alarms.
The above circuit includes user configurable hysteresis on the alarm values (set in example to 20 bits) and
allows for up 4 analogue alarm levels to be processed on a single network. Alarm status are configured to be
identical to digital alarm status i.e. Logic 1 Normal, Logic 0 Alarm.
Alarm annunciation is independant of the fail safe logic input and the O/C & S/C alarms are generated by the
USR3 package with the common fault bit used to give a fail safe logic input.
If 2 faults are diagnosed on and analogue input channel the module is marked as bad and analogue input is
given a negative value 8000H. This condition gives an O/C fault and trip the fail safe logic.