Appendix 4 Communication With The Redundant Cpu - Mitsubishi Electric Q81BD-J61BT11 User Manual

APPENDIX

Appendix 4 Communication with the Redundant CPU

Control system
Station No. 0
Terminal resistor
Before system switching
After system switching
App - 47
This section explains communication with the Redundant CPU when the CC-Link Ver.2
board is used.
(1) Incorporation into redundant system
In a Redundant CPU system, be sure to set the CC-Link Ver.2 board to a local
station.
Master station
(2) Access to the Redundant CPU
(a) Redundant CPU specify
To access the Redundant CPU, directly specify the station number of the
CC-Link module mounted on the station of the target Redundant CPU.
(b) Action to be taken at occurrence of system switching
After system switching, the Redundant CPU in the same system (control
system or standby system) can also be accessed by directly specifying the
station number that was specified before system switching.
1: When system switching occurs in the Redundant CPU system to be
accessed, the station number of the CC-Link module mounted on the
station of each Redundant CPU is also changed internally.
(Example) When the Redundant CPU in the control system is accessed
Master station
Control
system
Station No. 0
Terminal resistor
Standby master station
Control
system
Standby
system
Station No. 1
Terminal resistor
Standby master station
Standby system
Tracking cable
Standby master station
Tracking cable
Master station
Tracking cable
Master/local interface board
Station No. 1 Station No. 2
CC-Link
Standby
Master/local
system
interface board
Station No. 1
CC-Link
Standby
Master/local
system
interface board
Control
system
Station No. 0
CC-Link
MELSEC
Terminal resistor
1
Station No. 2
Terminal resistor
Station No. 2
Terminal resistor
App - 47