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12. PLC Axis Control
12.3 PLC Interface
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(9) When the start signal ON (=1) is earlier than the ACT signal ON (=1) (A section)
(9-1) When OFF the last ACT signal OFF is earlier than a start signal OFF (B section)
A
CT
Start
busy
den
move
Speed
A section
B section
When ACT is turned OFF at the 1st time, a start signal continues being ON, and since the
start signal is turned ON previously when ACT is turned ON at the 2nd time, NC cannot detect
the standup of a start signal. Therefore, a PLC axis does not operate by the 2nd start signal.
(9-2) When the ACT signal OFF is later than the start signal OFF (C section)
A
C
Start
busy
den
move
Speed
busy
C section
A section
When ACT is turned OFF at the 1st time, a start signal is turned OFF, NC can detect the
standup of a start signal. Therefore, a PLC axis operates by the 2nd start signal.
When the start signal ON (=1) is earlier than the ACT signal ON (=1), a PLC axis does not operate
according to the state of the last start signal. In order to avoid such a situation, please turn ON ACT
after a start signal or turn OFF ACT after a start signal.