Mitsubishi Electric QJ71E71-100 User Manual page 232

If system switching occurs, change the routing parameter settings using the RTWRITE instruction so that the
request source station or relay station accesses the destination through the station of the new control system
after system switching.
Network No.2
Standby system
QnPRH
CPU
Network No.1
(8) When the CPU module accesses a programmable controller on another station
using data link instructions
(a) Redundant system supported data link instructions
• By specifying the destination in Target station CPU type of the control data in any of the following data link
instructions, access can be performed to the control system/standby system or system A/system B.
• Operation performed for access to the control system/standby system or the system A/system B (example
of executing the READ instruction)
When the target station is the standby system, because the received command is addressed to the control
system CPU module (Target station CPU type: 3D0
through the tracking cable to read the data in the control system CPU module.
230
Request source station
E71
Station
QCPU
No.3
E71 E71
Station Station
No.1 No.1
Request
destination station
E71
QCPU Station
No.3
• READ/SREAD instructions
• WRITE/SWRITE instructions
• REQ instruction
Control system
Device
Network parameter setting
Transfer destination
network No.
1
Control system
E71 E71
QnPRH
Station Station
CPU
No.2 No.2
), data is relayed to the control system CPU module
H
QCPU E71
READ
Channel 3
Device
Standby system (target station)
Tracking cable
Relay
Relay destination
destination
network No.
station No.
2 1 2
Change the parameter
setting using the RTWRITE
instruction.
(Own station)