User`s manual

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Part names and settings of Qn(P)(R)(H)CPUs CPU modules

MELSEC System Q, Hardware 4 – 29

4.4.2 DIP switches

The DIP switches are used for setting the system protection and the valid parameter drives for

CPU types Q02, Q02H, Q06H, Q12H, Q12P(R)H, Q25H and Q25P(R)H. All switches are preset

to off as factory default. Switches SW4 and SW5 must not be used (without function).

Tab. 4-17: DIP switches

No. Name Application



BACKUP LED Indicates the backup or separate mode while the system is running normally:

 GREEN: Backup mode

 RED: Status in which control (RUN) cannot be continued by system

switching.

 ORANGE: Separate mode

 OFF: Debug mode (e. g. for optimising the program or trouble shooting)

The LED indication is as follows when the memory copy from control system to

standby system is executed:

– LED of the standby system flickers (red or orange) during execution of

memory copy, and is on after normal completion.

– BACKUP LED of the control system is on (red or yellow) during execution

of memory copy and after completion.



CONTROL LED Indicates the CPU module operates as control system or standby system.

 ON: Control system (the standby system is normal and system switching is

available); Debug mode

 OFF: Standby system



SYSTEM A LED System assignment

 ON: System A or debug mode.

 FLICKER: When the tracking cable is disconnected while the system runs

normally as the system A (keeps on flickering until the system A side tracking

cable is connected).

 OFF: System B (LED "SYSTEM B" LED turns on)



SYSTEM B LED System assignment

 ON: System B or debug mode.

 FLICKER: When the tracking cable is disconnected while the system runs

normally as the system B (keeps on flickering until the system B side tracking

cable is connected).

 OFF: System A ("SYSTEM A" LED turns on.)



TRACKING

connector

For data transfer both redundant PLCs are connected with a tracking cable.

Tab. 4-16: Part names of Q12PRHCPU and Q25PRHCPU

DIP switches SW1 SW2 SW3

QH00025C

System protection

 OFF: No protection

 ON: Protection

Parameter-valid drive

Parameters cannot be stored in standard RAM (Drive 3)

SW2 SW3 Parameter drive:

OFF OFF Program memory (Drive 0)

ON OFF SRAM card (Drive 1)

OFF ON Flash card/ATA card (Drive 2)

ON ON Standard ROM (Drive 4)