IDEC SmartRelay functions
IDEC SmartRelay Manual
231
Analog math error detection logic table
In the table below, Err represents the parameter of the
analog math error detection instruction that selects which
type of error to detect. ZD represents the zero division bit set
by the analog math instruction at the end of its execution: 1
if the error occurred, 0 if not. OF represents the overflow bit
set by the analog math instruction: 1 if the error occurred, 0
if not. The ZD/OF Err parameter represents the logical OR of
the zero division bit and overflow bit of the referenced analog
math instruction. Q represents the output of the analog math
error detection function. An ”x” indicates that the bit can be
either 0 or 1 with no influence on the output.
If the MathBN parameter is null, then the output Q is always
0.
Err
ZD
OF
Q
ZD
1
x
1
ZD
0
x
0
OF
x
1
1
OF
x
0
0
ZD/OF
1
0
1
ZD/OF
0
1
1
ZD/OF
1
1
1
ZD/OF
0
0
0
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