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3.22.3
Precautions for online change
(1) Effect on the scan time
Performing change increases scan time. ( Page 385, Appendix 3.2)
(2) Online change during boot operation
Even if the online change is executed, the status of boot source program is not changed.
(3) Operations prohibited during online change
Do not perform power-off or reset to the CPU module when changing the TC setting value or transferring data to
the program memory during online change. If performed, write the data to the CPU module again.
An error is displayed if any of the following operation is performed. Execute again after completing the operation.
• Online change (ladder mode), online change (files)
• TC setting value change
• Data transfer to the program memory
(4) Instructions do not operate normally during online change
If the following instructions are executed during online change, they do not operate normally.
• Rise instruction
• SCJ instruction
• STMR instruction
(a) Rise instruction
The rise instruction within the program targeted for online change will not be executed even though the
execution condition of the instruction (off on) is met at the completion of online change.
The corresponding rise instructions are PLS and P.
Online change
completed
END
0
A
END
1 scan
X0 status
ON
X0
OFF
OFF
OFF
ON
M0
OFF
ON
X0
OFF
ON
ON
ON
M0
OFF
ON
X0
OFF
OFF
ON
ON
M0
OFF
X0
[ PLS M0 ]
0
A
END
0
The rise instruction is not executed
even if its execution condition is off
CHAPTER 3 CPU MODULE FUNCTIONS
on.
3
153
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