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Issue 5 - September 2006
Page 47 of 65
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ESD
Network 007 - Analogue Alarm Monitoring and Logic Input
Scan Rate 00030 ms
Label 03002 Enabled
04080
>
R0502
>
00800
13202
OverlapDis13202
PI0001C
S/C
FAULT
13002
OverlapDis13002
PI0001C
O/C
FAULT
03800
>
R0502
>
03780
5502
PAHH0001C
HIGH
HIGH
ALARM
5502
PAHH0001C
13938
PI0001C-FLT
5004
13938
PI0001C-FLT
PI0001C
ANALOGUE
FAULT
PI0001C
ANALOGUE
FAULT
PALL0001C
LOGIC
INPUT
WorkingDis5004
00920
>
R0502
>
00900
4502
LOW
LOW
ALARM
PALL0001C
4502
LOW
LOW
ALARM
PALL0001C
13938
PI0001C-FLT
5005
PAHH0001C
LOGIC
INPUT
PI0001C
ANALOGUE
FAULT
WorkingDis5005
If safety critical analogue inputs are used, the alarm logic generated must be include fail safe logic.
Thie is Mandatory. A number of methods are available to generate fail safe digital logic inputs from analogue
inputs, an example utilising DEAD BAND elements is given above (The fault discretes used are those given
in the default Analogue test configuration). The example above if 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 2 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.
If 2 faults are diagnosed on and analogue input channel the module is marked as bad and the analogue input
is given a negative value 8000H. This condition gives an O/C fault and trip the fail safe logic.