Mitsubishi Electric MELSEC Q Series User Manual page 119

6 DATA USED FOR POSITIONING CONTROL
(a) Flash ROM write request /
Cd.100
flash ROM
Set "1" in "
Cd.100
READY signal [Y0] OFF. 1 is added to "
to flash ROM", and the value can be wrote to the flash ROM. "0" can be
automatically set in "
completion.
PLC READY signal [Y0]
Flash ROM write
Cd.100
request
Flash ROM write process
(QD74MH)
Number of write
Md.102
accesses to flash ROM
POINT
(1) Do not turn the system power supply OFF or reset the PLC CPU while writing
to the flash ROM. If the system power supply is turned OFF or the PLC CPU is
reset to forcibly end the process, the data backed up in the flash ROM will be
lost.
(2) Do not write the data to the buffer memory before writing to the flash ROM is
completed.
(3) The number of the flash ROM write with the sequence program after the single
system power supply ON or single PLC CPU reset is limited to up to 25.
Writing of the 26th times will cause an "error code 1902".
(4) The number of writes to the flash ROM after the system power supply ON can
be monitored in "
(5) The flash ROM write can be executed, after the system's power supply ON
and the PLC READY signal [Y0] ON. If the flash ROM write is executed
without turning ON the PLC READY signal [Y0] after the system's power
supply ON, a "warning code 10001" will occur and the flash ROM write cannot
be executed.
Md.102
Flash ROM write request" in the state of the PLC
Flash ROM write request" with the writing
Cd.100
ON
OFF
0
ON
OFF
0
Number of write accesses to flash ROM".
Md.102
6 - 40
MELSEC-Q
Number of write accesses to
Number of write accesses
Md.102
1
1
0