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6.2 Redundant System Network Overview
6.2.1 CC-Link IE Controller Network or MELSECNET/H PLC to PLC network
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(7) Precautions for Using Redundant System in CC-Link IE Controller
Network or MELSECNET/H PLC to PLC Network
(a) Programming of CC-Link IE Controller Network or MELSECNET/H
CC-Link IE Controller Network or MELSECNET/H network detects a temporary
communication error depending on conditions such as power supply ON/OFF or
cable and noise.
Create the program using CC-Link IE Controller Network or MELSECNET/H so
that it will not stop controlling even when the temporary communication error is
detected.
(b) Error detection by turning ON/OFF other station (including standby system)
When turning ON/OFF power supply of the other station (including standby
system) CPU module or booting and shutting down the personal computer where
CC-Link IE Controller Network interface board or MELSECNET/H board is
mounted, CC-Link IE Controller Network module or MELSECNET/H module of the
control system may issue a system switching request, detecting a temporary
communication error.
When the above-mentioned system switching request is issued before the
standby system is started up, a continuation error "CAN'T SWITCH" may be
detected in the control system CPU module. In this case, control can be continued
normally. Therefore, create the program so that control will not be stopped due to
error detection.
For canceling the error "CAN'T SWITCH", refer to Section 8.1.16.
For details of CC-Link IE Controller Network or MELSECNET/H, refer to the
following manual.
CC-Link IE Controller Network Reference Manual
Q Corresponding MELSECNET/H Network System Reference Manual
(PLC to PLC network)
(c) Usage in debug mode when CC-Link IE Controller Network modules are
mounted
When CC-Link IE Controller Network modules are mounted, do not connect CC-
Link IE Controller Network module on both systmes to the network at the same
time.
In the debug mode, the system B CPU module uses the same parameters for the
system A CPU module for operation. Therefore, control station overlap and station
number overlap occur when connecting to the network at the same time.
