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MELSEC-Q
7 FUNCTION
(2) Precautions
Take a note of the following when writing during RUN:
(a) The memory that can be written during RUN is only program memory.
1) If the write during RUN is performed while booting a program from a
memory card (RAM), the program to be booted will be changed. While
booting, it takes some time until the write during RUN is completely
executed.
2) If the write during RUN is performed while booting a program from the
standard ROM or memory card (ROM), the program to be booted will
not be changed.
Before turning off the PLC or resetting the High Performance model
QCPU, write the program memory into the standard ROM or memory
card (ROM).
(b) A maximum of 512 steps can be written at once during RUN.
(c) When a low speed execution type program is being executed, the RUN
write is started once the low speed execution type program is complete.
Also, the low speed execution is stopped temporarily during a RUN write.
Scan execution type
program step 0 to END
1 Scan1 Scan1 Scan1 Scan
Low speed execution
type program step
201 to 320
Low speed execution
type program step
321 to END
Low speed execution
type program step
0 to 120
Low speed execution
type program step
0 to 200
1) 2) 3) 4)
Scan execution type
program step 0 to END
Scan execution type
program step 0 to END
Scan execution type
program step 0 to END
1): RUN write command of the scan execution type program
2): RUN write execution of the scan execution type program
3): RUN write command of the low speed execution type program
4): RUN write execution of the low speed execution type program
(d) If the write during RUN is executed while the PLOAD, PUNLOAD or
PSWAP instruction is executed, the processing will enter into a stand-by
status for the write during RUN. If the write during RUN is executed while
the PLOAD, PUNLOAD or PSWAP instruction is executed, the execution of
the instruction is delayed until the write during RUN is executed.
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