MesCom
– Workshop Manual – D6000/i14/V10
© Dycon Ltd 2014
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42
7.4.3 Counter Input
On
Off
Hysteresis
Bottom
Threshold
Inp
ut
V
a
lu
e
0v
3.0v
Off
On
Off
On
Off
On
Off
On
Off
D
ec
re
as
ed
to
Ov
er
flo
w
Low
Threshold
C
ou
nte
r V
a
lu
e
0
65535
Inc
re
as
e to
T
hr
es
ho
ld
Can be used to count the number of times an input has been activated. This input uses the
digital input method to determine the input state. If this changes in the selected direction
(positive or negative edge), then the counter is increased by 1 count.
The counter input requires three thresholds but due to the universal nature of the MesCom
point system, all 4 thresholds need to be configured. The first threshold is used for digital
input filter, the second is the counter threshold, and the third is the overflow threshold. Two
labels are used, the first for Overflow events and second for Threshold events.
9876 POINT Input3 TYPE 1
9876 POINT Input3 COUNT pos
9876 POINT Input3 THRES 0.5 #2000 #5000 3.0
9876 POINT Input3 LEVELS Overflow Threshold na na na
9876 POINT Input3 DEBOUNCE 20
Where first value is the digital input threshold, the second value is the count threshold and
the third is the overflow threshold (maximum count value).
# Signifies a raw count value and not a scaled voltage value.
Should an increment cause the value to reach the threshold value, then a fault alarm can be
created. Additional when the counter reaches the overflow value a restore alarm can be
created. See diagram, black dot overflow (restore), white dot moving threshold (fault).
9876 POINT Input3 ALARM both
Hysteresis can be applied the same as digital inputs:
9876 POINT Input2 HYST 0.1
