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6.2 Redundant System Network Overview
6.2.5 Serial Communication Modules
6
REDUNDANT SYSTEM NETWORKS
6.2.5 Serial Communication Modules
Mount the serial communication module on the MELSECNET/H remote I/O station or
extension base unit. (The serial communication module cannot be mounted to the main
base unit where the Redundant CPU module is mounted.)
Communication from the serial communication module to external devices can be made
by MC protocol, nonprocedural protocol, and bidirectional protocol.
For MC protocol, external devices can communicate with the specified system, i.e., control
system, standby system, system A, or system B.
Refer to the following manual for MC protocol.
Q Corresponding MELSEC Communication Protocol Reference Manual
POINT
When the extension base unit is mounted to the serial communication module,
create programs using the FROM/TO instruction, since the dedicated instructions
cannot be used.
For the sample program using the FROM/TO instruction, refer to Appendix 6.
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