Mitsubishi Electric Q80BD-J71GP21-SX User Manual page 225

APPENDICES
<When system switching occurs due to standby system error>
Connection to the
control system
Personal computer
(CC-Link IE Controller
Network board)
Connection to the
control system
Personal computer
(CC-Link IE Controller
Network board)
POINT
• Path switching is not executed when a communication to the Redundant CPU
specified at Logical station No. is faulty at communication start
communication error occurs.)
When a communication is faulty, refer to (4)(b) Checking method of path
switching occurrence and access examples of path switching in this section and
clear the communication disturbance.
*1: First communication after execution of the mdOpen function in the MELSEC data link library
(communications using the mdReceiveEx, mdSendEx, mdDevRstEx, mdDevSetEx, mdRandREx,
mdRandWEx, mdReceive, mdSend, mdControl, mdDevRst, MdDevSet, mdRandR. mdRandW or
mdTypeRead function).
• If other station access (including the programmable controller CPU other than the
Redundant CPU) is made to 257 or more stations simultaneously, communication
path may not be automatically switched.
CC-Link IE Controller Network
Control system
CC-Link IE Controller Network
Control system
Figure 2 Path switching example 2
Appendix 1 Precautions for Accessing Redundant CPU System
CC-Link IE Controller Network module
MELSECNET/H module
MELSECNET/H
Standby system
Tracking cable
CC-Link IE Controller Network module
MELSECNET/H module
MELSECNET/H
Tracking cable
*1
9
10
Standby system
error
11
12
Standby system
13
(A
14
A
I
App
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