West Control Solutions KS98-1 - Manual (Page 149)

Alarm with offset ( x1 - x0):
x1 can be shifted by means of x0. This corresponds to the offset of alarm limits (L1, L2, H1 and H2) in par-
allel to the x-axis.
Inputs/outputs
Analog inputs
x1
Input value to be monitored
H1
High alarm 1
L1
Low alarm 1
Digital outputs
L1
Low alarm 1 - is logic 1 with x1 < L1
L2 Low alarm 2 - is logic 1 with x1 < L2
H1
High alarm 1 - is logic 1 with x1 < H1
H2
High alarm 2 - is logic 1 with x1 < H2
Analog output
y1
Calculated and limited input signal x1.
Configuration parameters:
Parameter Description Range Default
Select
Selection of variable to be
monitored
x1 x1 t
D alarm dx1/dt
Alarm with offset x1-x0
Parameters:
Parameter Description Range Default
H2
High alarm 2 -29 999 ... 999 999 9999
L2 Low alarm 2 -29 999 ... 999 999 -9999
x0 Offset x0 -29 999 ... 999 999 0
Xsd
Switching hysteresis 0 ... 999 999 1
Limit value signalling and limiting 9499-040-82711
III-149 ALLV ( alarm and limiting with variable limits (No. 41))
Xsd
min
max
L1, L2 H1, H2
x
Fig. 13 Switching hysteresis and alarm limits:
+x
0
-x
0
x
y
Fig. 14 Offset of the alarm limits