Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 40

When the networks contain a redundant system
• When the communication paths are automatically set, the paths are updated if system switching occurs in a redundant
system on the paths. During update of the communication paths, communications may be interrupted or data may be lost
because the paths are temporarily undetermined. If an error occurs in communications, resend data from the request
source.
• When the request source is a redundant system and the communication paths are automatically set, perform the transient
transmission from the control system. When performing the transient transmission from the standby system, set "Routing
Setting" of "CPU Parameter"
• When the request destination is a redundant system and the communication paths are automatically set, specify the control
system station as the destination. When specifying the standby system as the request destination, set "Routing Setting" of
"CPU Parameter".
• When relaying a redundant system and setting the communication paths manually, set the control system station as a relay
station in "Routing Setting" of "CPU Parameter". If system switching occurs, the relay station needs to be changed to a
station in the new control system using the RTWRITE instruction.
1 FUNCTIONS
38
1.2 Transient Transmission