Mitsubishi Electric QJ71E71-100 User Manual page 227

(b) Communication procedure example for access to the control system CPU module in
a redundant system
The following shows a communication procedure example. Place the E71 in open wait status and perform
open/close processes from the connected device.
Example of a communication procedure
Perform the open process to the system A.
ON: The system A is
the control system.
Is SM1515
(operating system status) on?
OFF: The system A is the standby system.
Is SM1516
(operating system status) on?
ON: The system A is the standby system.
A command message is sent.
I/O No. of the request destination module: 03D0
Was the response
message normally sent?
YES
YES
Is this process repeated?
NO
Perform the close process to the system A.
Perform the close process to the system A.
End
Perform the open process to the system B.
OFF
ON: The system B is
the control system.
Is SM1515
(operating system status) on?
Is SM1516
(operating system status) on?
A command message is sent.
I/O No. of the request destination module: 03D0
H
NO NO
Was the response
message normally sent?
Is this process repeated?
Perform the close process to the system B.
Perform the close process to the system B.
CHAPTER 14 OTHER FUNCTIONS
The TRK.CABLE ERR. has occurred.
For details, refer to the QnPRHCPU User's
Manual (Redundant System).
OFF: The system B is
the standby system.
OFF
ON: The system B is
the standby system.
H
YES
YES
NO
14
225