Siemens LOGO! Manual page 213

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.
Err
ZD
ZD
OF
OF
ZD/OF
ZD/OF
ZD/OF
ZD/OF
If the MathBN parameter is null, then the output Q is always 0.
Setting the Par parameter
The parameters MathBN, AutoRst, and Err can be set in programming mode or parameter
assignment mode.
View in programming mode (example):
Use the
change a value, use the
the OK key to accept changes.
View in parameter assignment mode (example):
LOGO!
Manual, 10/2017, A5E01248535-AA
ZD
1
0
x
x
1
0
1
0
and keys to navigate between the MathBN, AutoRst, and Err parameters. To
and
OF
x
x
1
0
0
1
1
0
keys to scroll through value choices for each value. Use
LOGO! functions
4.4 Special functions list - SF
Q
1
0
1
0
1
1
1
0
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