System Configuration - Mitsubishi Electric MELSEC iQ-R Series User Manual

System configuration

This section describes the redundant system configuration of the remote head module.
The remote head modules are mounted in the CPU slot and slot No.0 of the main base unit.
The remote head module mounted in the CPU slot is remote head No.1 (1) and the remote head module mounted in the slot
No.0 is remote head No.2 (2).
(1) (2)
When a redundant system is configured, to specify the mounted remote head module, an I/O number is also assigned to the
remote head module. I/O numbers fixed to remote head numbers are assigned as follows:
Remote head number Start I/O number of remote head module
Remote head No.1 3E00H
Remote head No.2 3E10H
• When the remote head module of remote head No.1 is not mounted or has failed, the redundant system will
not start.
• When the remote head module of remote head No.1 has failed and systems have been switched, replace
the remote head module immediately and perform the restoration operation. The redundant system does
not start even if the system is powered off and on or reset while remote head No.1 is in the state of failure.
1 FUNCTIONS
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1.8 Redundant Function
1