User`s manual

Part names and settings of Qn(P)(R)(H)CPUs CPU modules
MELSEC System Q, Hardware 4 – 31
4.4.4 Latch clear operation
Latch clear (switch off or set to 0) can be performed for stored Latch data set by parameters.
Q00JCPU, Q00CPU and Q01CPU
The CPU modules Q00J, Q00 and Q01 are not equipped with a switch for latch clear operation.
Latch clear can only be performed by the remote latch clear operation of GX (IEC) Developer.
Q02CPU, Q02HCPU, Q06HCPU, Q12(P)(R)HCPU, Q25(P)(R)HCPU
To perform latch clear, operate the switches in the following procedure:
 Set the RUN/STOP switch to "STOP".
 Set the RESET/L.CLR switch to the L.CLR position several times until the USER LED flashes
(ready for latch clear).
 Set the RESET/L.CLR switch to the L.CLR position one more time.
The USER LED turns off (latch clear complete).
4.4.5 Data transfer from memory card to standard ROM
 Power off the programmable controller.
 Insert the memory card that contains the parameters and programs to be booted onto the
CPU module.
 Set the DIP switches on the CPU module (section 4.4.2) so that the valid parameter drive
is matched with the memory card to be installed.
When a SRAM card is installed: SW2: On, SW3: Off
When a Flash card/ATA card is installed: SW2: Off, SW3: On
 Power on the programmable controller.
 The BOOT LED will flash when automatic write to standard ROM is completed.
 Turn off the programmable controller.
 Remove the memory card, and then set the valid parameter drive to the standard ROM with
the CPU module's DIP switches.
Standard ROM: SW2: On, SW3: On
The parameters and programs will be booted from the standard ROM to the program memory
when the programmable controller is turned on to enable actual operations.
NOTE The valid/invalid for latch clear in the clear range of latch clear operation can be set for each
device. The setting can be mode in the device setting of the PLC parameter.
NOTE In addition to the way of using the RESET/L.CLR switch for latch clear, remote latch clear
may be performed from GX (IEC) Developer.
NOTE The Data transfer from memory card to standard ROM can be selected in the programming
software GX Developer or GX IEC Developer.