Easy Electronics xLogic Micro PLC User Manual page 178

Parameter Referenced FB
The value for the Referenced FB parameter references the block number of an already-programmed
analog math function block.
Description of the function
The analog math error detection block sets the output when the referenced analog math function block
has an error. You can program the function to set the output on a zero division error, an overflow error,
or when either type of error occurs.
If you select the automatically reset checkbox, the output is reset prior to the next execution of the
function block. If not, the output retains its state until the analog math error detection block is reset with
the R parameter.
In any scan cycle, if the referenced analog math function block executes before the analog math error
detection function block, the error is detected in the same scan cycle. if the referenced analog math
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
division
Zero
division
Overflow
referenced analog math function block.
zero of
1 X
0 X
X 1
Output
1
0
1
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