Switch Operation After Program Write; Latch Clear Operation; Handling Of The Memory Card At Power-On - Mitsubishi Electric MELCEC Q Series User Manual

4. CPU MODULE
4.6.2

Switch operation after program write

This section describes switch operations after program write.
(1)
(2)
4.6.3

Latch clear operation

(1)
4.6.4

Handling of the memory card at power-on

Do not install or remove the memory card while the power is on.
If installing or removing the memory card at power-on, the data within the memory card
may be corrupted.
Writing programs with the CPU module in STOP state
When writing a program in the CPU module in the STOP status, follow the procedure
below.
(a) RUN/STOP switch: STOP
RUN LED: Off...........CPU STOP status
(b) RUN/STOP switch: STOP
RUN LED: On............CPU RUN status
Writing programs during RUN
When writing a program during RUN of the CPU module, do not operate the
switches.
Latch clear operation procedure
To perform latch clear, operate the RESET/L.CLR switch as follows.
(a) RESET/L.CLR switch: Turn the switch to L.CLR several times until the USER
LED flickers.
(Do not turn it to RESET.)
USER LED: Flicker...........Ready for latch clear
(b) RESET/L.CLR switch: Turn the switch to L.CLR once again.
USER LED: Off.............Latch clear completed
POINT
The write protect information of the memory card can be recognized by the CPU
module when the programmable controller is powered on or when a CPU module
is reset. Note the following.
• When the power supply is turned on with the memory card write protect switch
on, the program cannot be written even when the memory card write protect
switch is turned off to modify the program. To modify the program, turn off the
power supply or reset the CPU module.
• When the power supply is turned off with the memory card write protect switch
set to off, the write protect will not function even when the memory card write
protect switch is turned on to protect the program. To enable write protection,
turn off the power supply or reset the CPU module.
Program write
RUN
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