Rievtech ELC-12AC-R-N, User Manual

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function block executes after the analog math error detection function block, the error is detected in the
next scan cycle.
Analog math error detection logic table
In the table below, Error to Detect represents the parameter of the analog math error detection
instruction that selects which type of error to detect. Zero 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. Zero division OR Overflow
represents the logical OR of the zero division bit and the overflow bit of the referenced analog math
instruction. Output (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.
Error to
Detect zero of Output
Zero
division 1 X 1
Zero
division 0 X 0
Overflow X 1 1
Overflow X 0 0
Zero
division OR
Overflow 1 0 1
Zero
division OR
Overflow 0 1 1
Zero
division OR
Overflow 1 1 1
Zero
division OR
Overflow 0 0 0
If the Referenced Analog Math FB is null, then the output is always 0.