MesCom
– Workshop Manual – D6000/i14/V10
© Dycon Ltd 2014
-
39
7.4.1 Analogue Input
Full
High
Normal
Low
Empty
Hysteresis
Bottom
Threshold
Low
Threshold
High
Threshold
Top
Threshold
Input
V
a
lue
0v
3.0v
D
e
c
re
a
s
e
d
to
E
m
pty
Incr
e
a
s
e
d to
Low
Incr
e
a
s
e
d to
N
orm
a
l
Incr
e
a
s
e
d to
H
igh
Incr
e
a
s
e
d to
Full
D
e
c
re
a
s
e
d
to
H
igh
D
e
c
re
a
s
e
d
to
N
or
ma
l
D
e
c
re
a
s
e
d
to
Low
The input voltage reading is averaged* and then compared to the 4 threshold levels to
determine which of the 5 states the input is in. The 5 states can be given labels - in the
diagram these are Empty, Low, Normal, High, Full.
9876 POINT Input1 TYPE 3
9876 POINT Input1 THRES 0.2 1.0 2.0 2.8
9876 POINT Input1 LEVELS Empty Low Normal High Full
9876 POINT Input1 AVERAGE 20
Threshold values are input voltage values in the range 0.0000 to 3.0000.
An input can be configured to create alarm events any time the state changes, only when
moving away from normal (fault), only when moving toward normal (restore) or no alarms.
See diagram, black
dot moving away, white dot moving toward ‘Normal’.
9876 POINT Input1 ALARM fault
Hysteresis can be applied to the Threshold levels. See diagram above, hysteresis allows an
input to fluctuate around a threshold with causing repeated notifications. For the 2 thresholds
above ‘Normal’ the hysteresis is applied when the signal is dropped (toward ‘normal’), in
effect making the threshold (threshold
– hysteresis). For the 2 thresholds below ‘Normal’ the
hysteresis is applied when the sign
al is rising (toward ‘normal’), in effect making the
threshold (thr hysteresis). The hysteresis value is applied to all thresholds.
9876 POINT Input1 HYST 0.1
