When The Networks Contain A Redundant System - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

When the networks contain a redundant system

• When setting a communication path automatically, after the time specified by the destination alive check timer (time
calculated from destination alive check start interval timer value, destination alive check interval timer value, and
destination alive check resend count), the communication path setting will be changed. Set as small a value as possible for
the "Destination Alive Check Start Interval Timer", "Destination Alive Check Interval Timer", and "Destination Alive Check
Resend Count".
• 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
communications from the control system. When performing the communications 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.
Appendix 6 Communications with Different Networks
A
APPX
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