Mitsubishi Electric MELSEC iQ-R Series User Manual page 197

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.
Instructions which do not
operate correctly
Rising instruction (PLS and P
instructions)
Falling instruction (PLF and F
instructions)
SCJ instruction
STMR instruction
• 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.
Online change
completion
A
END 0 END
Status of X0
ON
X0
OFF
OFF → OFF
ON
M0
OFF
ON
X0
OFF
ON → ON ON
M0
OFF
ON
X0
OFF
OFF → ON
ON
M0
OFF
Description
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.
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.
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.
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.
X0
[ PLS M0 ]
0 A END 0
1 scan
(1)
14 WRITING DATA TO THE CPU MODULE
14.3 Precautions
14
195