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MELSEC-Q
1 OVERVIEW
(g) The redundant system uses the multiplex remote master function to control
I/O modules and intelligent function modules. (The QnPRHCPU should be
used in the redundant system.)
If the multiplexed master station (control system) fails, the multiplex remote
master function will switch the master station from "control system" to
"standby system". At this time, the multiplexed remote sub-master station
is switched from "standby" to "control", continuing the remote I/O control.
The sub-master station (control system) that is controlling the remote I/O
stations will keep its control even if the master station (standby system) has
returned to normal status.
(Refer to Section 7.11 "Multiplex Remote Master Function for Redundant
System (QnPRHCPU Only).)
Remote I/O station (R)
Remote I/O station (R)
Remote I/O station (R)
Tracking cable
Multiplexed remote master station (DM
R
)
Control system Standby system
Multiplexed remote sub-master station (DSM
R
)
Standby system Control system
(h) A maximum of 7 extension base units can be connected to the remote I/O
module (eight base units including the main base unit), allowing the
installation of up to 64 modules.
The maximum overall length of extension cables is 13.2m, ensuring a
flexible layout of extension base units.
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