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Issue 5 - September 2006
Page 52 of 65
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Network 012 - Prevent AO outputs being driven below zero and losing health
Scan Rate 00030 ms
Label 01012
Enabled
ESD
00256
MOVE
00001
R1000
00256
>
00000
R1000
>
00256
>
00000
R1002
>
00256
MOVE
00001
R1002
00256
MOVE
00001
R1001
00256
>
00000
R1003
>
00256
MOVE
00001
R1003
00256
>
0000
R1001
>
The dead band element and the move function are mandatory to ensure that the
analogue outputs are not driven below 256 decimal which will result in the module losing
health. The value in the move element may be modified to higher value to prevent the
output being driven below some minimum value example 4 mA = 895.
A similar network may be used to prevent the output being driven above a fixed value
example 20mA = 3455.