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2.
Function block with EN/ENO
The following table lists the execution conditions and operation results.
Execution condition
EN
TRUE (Executes operation)
FALSE (Stops operation)
• Timing chart
ON
EN
OFF
ON
(s)
OFF
OFF
ON
ENO
OFF
ON
(d)
OFF
When EN is on and on
At the next scan,
the falling edge of (s),
(d) turns off.
(d) turns on.
Operation error
There is no operation error.
Operation result
ENO
TRUE
FALSE
ON
ON
ON
ON
OFF
ON
ON
ON
OFF
OFF
When EN is off, (d) holds the output
of the previous scan.
(d)
Operation output value
Previous output value
ON
ON
ON
OFF
ON
25 EDGE DETECTION FUNCTION BLOCKS
ON
ON
OFF
ON
ON
OFF
25.2 Falling Edge Detector
25
847
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