5 WRITING DATA TO THE CPU MODULE
5.3 Precautions
121
5
If the later program memory transfer (from the engineering tool 2) has completed with an error, the former program memory
transfer (from the engineering tool 1) does not complete. In such a case, write the data again instead of powering off and on or
resetting the CPU module.
When the online change (ladder block) is used
The following describes the precautions on using the online change (ladder block).
■When deleting the OUT instruction which is on
When deleting the OUT instruction (coil) which is not necessary for control, check that the OUT instruction is off before
deleting it. If the OUT instruction is deleted without turning it off in advance, the output will be retained.
■Program file not registered in program setting
A program file which is not registered in parameter setting cannot be written.
■Instructions which do not operate correctly
The following table lists the instructions which do not operate correctly during the online change (ladder block) or writing data
to the programmable controller. In the SFC program, these instructions do not operate correctly only when they are in active
steps.
• Rising instruction
When a rising instruction exists within the range to be changed, the rising instruction will not be executed even if the execution
condition (OFF to ON) is satisfied after completion of the online change (ladder block) or writing data to the programmable
controller.
Instructions which do not
operate correctly
Description
Rising instruction (PLS and P
instructions)
When a rising instruction exists within the range to be changed, the rising instruction will not be executed even if the
execution condition (OFF to ON) is taken at completion of online program change.
Falling instruction (PLF and F
instructions)
When a falling instruction exists within the range to be changed, the falling instruction will not be executed even if the
execution condition (ON to OFF) is taken at completion of online program change.
SCJ instruction If an SCJ instruction exists within the range to be changed and the execution condition is taken, the program will jump
without waiting for a single scan.
STMR instruction If an STMR instruction exists within the range to be changed, the STMR instruction will be executed.
(1) The rising instruction will not be executed even if the execution condition is OFF to ON.
END END END00 0
OFF → OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON → ON
X0
M0
X0
M0
X0
M0
(1)
[ PLS M0 ]
X0
A
A
OFF → ON
Online change
completion
1 scan
Status of X0
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