West Control Solutions KS98-1 - Manual (Page 150)

III-8.3 EQUAL ( comparison (No. 42) )
The function checks the two analog input values x1 and x2 for equality.
The values are equal, if the amount of their difference is smaller than oder equal to the preset tolerance.
Comparison conditions z6 z5 z4 z3 z2 z1
x2 + Diff < x1 1 1 0 0 0 1
x2 - Diff £ x1 £ x2 + Diff 1 0 1 0 1 0
x2 - Diff > x1 0 1 1 1 0 0
The tolerance can be adjusted either as parameter Diff ( Mode = Para.Diff) or
entered at analog input Diff ( Mode = Inp.Diff).
Inputs/outputs
Analog inputs
x1
1st input value to be compared
x2 2nd input value
Diff
Tolerance for comparison operations
Digital outputs
z1 z1= 1 with x2 + Diff < x1
z2 z2= 1 with x2 - Diff £ x1 £ x2 + Diff
z3 z3= 1 with x2 - Diff > x1
z4 z4= 1 with x2 + Diff ³ x1
z5 z5= 1 with x2 - Diff > x1 > x2 + Diff
z6 z6= 1 with x2 - Diff £ x1
No configuration parameters!
Parameters:
Parameter Description Range Default
Mode
Tolerance source
Parameter Diff Para.Diff t
analog input Diff Inp.Diff
Diff
Tolerance for compari-
son operation
0 ... 999 999 0
9499-040-82711 Limit value signalling and limiting
EQUAL ( comparison (No. 42) ) III-150
Mode
Diff
X1
X2
Diff X1>X2
X1=<X2
X1=X2
X1<>X2
X1<X2
X1>=X2