BG 805 981 BE (0201) QMG422.oi
59
The window comparator is only possible in conjunction with the DO 420A module
Choose
trip-TYPE : ABS
With
trip-LEVEL-A
enter the upper threshold
With
trip-LEVEL-B
enter the lower threshold
With
trip-DO-A:xx, trip-DO-B:xx
assign A and B to the same DO bit.
LEVEL-B LEVEL-A
TRIP B
TRIP A
&
TRIP A&B
OFF
ON
OFF
ON
Measured
value
ON
OFF
OFF
The hysteresis prevents fluttering with unsteady signals. The minimum hysteresis is
10%
Choose
trip-TYPE : HYST
With
trip-LEVEL-A
enter the lower threshold
With
trip-LEVEL-B
enter the upper threshold
TRIP A switches ON when the signal drops below LEVEL-A and switches OFF
when it exceeds LEVEL-B
LEVEL-A LEVEL-B
TRIP A
TRIP A
OFF
ON
Measured
value
OFF
ON
TRIP B works inversely to A
LEVEL-A LEVEL-B
TRIP B
TRIP B
Measured
value
ON
OFF
OFF
ON
With
trip-DO-A : xx, trip-DO-B : xy
assign the DO bits if DO 420A exists
This requires two measurement channels and one DO 420A.
With
select:x
choose the first measurement channel x
Choose
trip-TYPE : HYST
With
trip-LEVEL-A
enter the lower threshold
With
trip-LEVEL-B
enter the upper threshold
With
trip-DO-A
assign a DO bit
With
aux-COPY TO CH:x+
1 copy channel x to channel x+1
With
select:x+1
choose the measuring channel x+1
With
trip-LEVEL-A
enter the lower threshold
With
trip-LEVEL-B
enter the upper threshold
TRIP x&x+1
TRIP x+1
TRIP x
&
LEVEL-
Ax Bx Ax+1Bx+1
OFF
ON
OFF
OFF
ON
OFF
ON
Measured
value
Many other combinations are feasible.
Window comparator
Hysteresis function
Window and hysteresis