Latch Clear Operation; Basic Model Qcpu And Universal Model Qcpu; High Performance Model Qcpu, Process Cpu And Redundant Cpu - Mitsubishi Electric Q26UD(E)HCPU User Manual

6.5

Latch Clear Operation

6.5.1

Basic model QCPU and Universal model QCPU

To clear latch data, perform either of the following.
• Remote latch clear using a programming tool
• Latch clear by using the special relay and special register areas
● The latch data cannot be cleared using a switch of the CPU module.
● The valid/invalid for latch clear in the clear range of latch clear operation can be set for each device. The setting can be
made in the device setting of the PLC parameter.
● For details of the latch clear operation, refer to the following.
User's Manual (Function Explanation, Program Fundamentals) for the CPU module used
6.5.2
High Performance model QCPU, Process CPU and Redundant
CPU
To perform latch clear, operate the RESET/L. CLR switch in the following procedure.
1.
RUN/STOP switch: STOP
2.
RESET/L. CLR switch: Set the switch to the L. CLR position several times until the USER LED
flashes.
USER LED: Flash (Ready for latch clear)
3.
RESET/L. CLR switch: Set the switch to the L. CLR position one more time.
USER LED: Off (Latch clear complete)
● The valid/invalid for latch clear in the clear range of latch clear operation can be set for each device. The setting can be
configured in the device setting of the PLC parameter.
● In addition to the way of using the RESET/L. CLR switch for latch clear, remote latch clear may be performed from
programming tool.
For details of remote latch clear operation by programming tool, refer to the following.
Qn(H)/QnPH/QnPRHCPU User's Manual (Function Explanation, Program Fundamentals)
Note 6.1 Universal
Only the High-speed Universal model QCPU whose serial number (first five digits) is "15043" or later supports this type of latch clear
operation.
184
Note 6.1
Note 6.1