Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1988

2.
Function block with EN/ENO
The execution conditions and operation results will be as follows.
Execution condition
EN
TRUE (executed)
FALSE (not executed)
• Timing chart
When (n)=3
ON
EN
OFF
ON
(s1)
OFF OFF
(s2)
OFF
(s3)
OFF
(s4)
OFF
ON
ENO
OFF
(d1)
OFF
ON
(d2)
OFF
0 1
(d3)
(1)
(1) When (s1) turns on while EN is on, the value in (d3) is counted up.
(2) When (s3) turns on while EN is on, the value in (d3) is initialized.
(3) When (s2) turns on while EN is on, the value in (d3) is counted down.
(4) When (s4) turns on while EN is on, the value in (d3) is initialized.
Operation error
There is no operation error.
36 COUNTER/TIMER FUNCTION BLOCKS
1986
36.3 Up/Down Counter
Operation result
ENO
TRUE
FALSE
ON
ON ON ON ON
OFF OFF OFF OFF
ON ON
OFF OFF
ON
ON
2 0
(2)
ON ON
ON
ON ON ON
OFF OFF OFF
ON ON
OFF
ON ON
ON
ON
1 0
(3) (4)
(d1), (d2), (d3)
Operation result output value
Previous output value
ON
ON ON ON
OFF OFF
OFF
ON
3 2 1