138
3.21.3 Precautions for online change
(1) Effect on the scan time
Performing change increases scan time. ( Page 309, Appendix 2.2)
(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
When data are written to the CPU module in the RUN status, the following instructions do not operate normally.
• Rise instruction
• SCJ instruction
(a) Rise instruction
The rise instruction is executed when the instruction is in the data written to the CPU module in the RUN status,
even if the execution condition (on → off) has been met at completion of the online change.
The corresponding rise instructions are PLS and P.
OFF OFF
ON ON
OFF ON
Online change
completed
END
1 scan
END END00 0
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
X0 status
X0
M0
X0
M0
X0
M0
The rise instruction is not executed
even if its execution condition is off on.
[ PLS M0 ]
X0
A
A
To Next Page
Loading...
Need help?
General
