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6.2 Redundant System Network Overview
6.2.5 Serial Communication Modules
6
REDUNDANT SYSTEM NETWORKS
(3) Communication between External Devices and System A/System B
(a) Communication by MC Protocol
In order to perform the communication with the system A/system B CPU module,
specify "System A" or "System B" on each external device by MC protocol.
If "System A" or "System B" is specified by MC protocol, communication with the
specified system CPU module can be performed even when system switching
occurs.
This communication can be performed by MC protocol only.
Diagram 6.32 Communication with System A CPU Module by MC Protocol
MELSECNET/H Remote I/O network
Tracking cable
System A -
Control System
System B -
Standby System
Multiplexed Remote Master Station
Remote I/O module
Serial communication
module
Multiplexed Remote Sub-master Station
System switching
activated
Remote I/O stationRemote I/O station
MELSECNET/H Remote I/O network
Tracking cable
System A -
Control System
System B -
Standby System
Multiplexed Remote Master Station
Remote I/O module
Serial communication
module
Multiplexed Remote Sub-master Station
Remote I/O stationRemote I/O station
When specifying
System A using MC
protocol
When specifying
System A using MC
protocol
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