4HARDWARE SPECIFICATION OF THE CPU MODULE

4.4 Latch Clear Operation

MELSEC-Q

To perform latch clear, operate the RESET/L.CLR switch in the following procedure.

1) RUN/STOP switch

: STOP

2) RESET/L.CLR switch

: Move the switch to L.CLR several times until the

 

USER LED flickers.

"USER" LED: Flicker

Ready for latch clear.

3) RESET/L.CLR switch

: Move the switch to L.CLR once more.

"USER" LED: OFF

Latch clear complete.

POINTS

(1)The ineffective range for latch clear can be set for each device by the device setting parameter.

(2)In addition to the way of using the RESET/L.CLR switch for latch clear, remote latch clear may be performed from GX Developer.

For details of the remote latch clear operation using GX Developer, refer to the High Performance model QCPU (Q mode) User's Manual (Function Explanation, Program Fundamentals).

4.5Executing Automatic Write to Standard ROM.

(1)Order of execution for automatic write to standard ROM

Automatic write to the standard ROM is carried out with the following procedures.

(a)Operation with GX Developer (setting automatic write to standard ROM)

1)Check the "Auto Download all Data from Memory card to Standard ROM" item in the PLC parameter boot file setting.

Set the parameter and program to be booted at the "Boot file setting" section.

(Set the "Transfer from" to "Standard ROM".)

Check "Auto Download all

Data from Memory card to

Standard ROM ".

Set the "Transfer from" to "Standard ROM".

2)Store the set parameters and programs to be booted in the memory card.

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