Mitsubishi Electric QJ71E71-100 User Manual page 228

(c) Precautions for writing a parameter file or program file
• Write the same file to the system A and system B. If different files are written to the systems, or a file is
written to only one system, an error will result.
• Write the file while the switch on the CPU module is set to STOP.
• Write the file in the following procedure.
*1 After writing the parameter file, reset the both CPU modules.
*2 When the operating status of the control system CPU module is switched from STOP to RUN, check the error status of
the standby system CPU module. If an error has occurred, set the error code (6010
clear the error.
(4) Communicating using a fixed buffer
(a) Receive process in a standby system
When data is sent to the E71 mounted with the standby system CPU module, the data received by the E71 is
discarded, and the receive process is not performed. (Fixed buffer reception status signal does not turn on.)
(b) Receive process in an interrupt program
When the control system is switched to the standby system by system switching before execution of an
interrupt program, the interrupt factor is held. When the system is switched again and the standby system is
switched to the control system, the interrupt program is executed by the held interrupt factor. (The interrupt
factor is not transferred to the other system.)
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Start
Perform the remote STOP to the control system CPU module.
Perform the remote STOP to the standby system CPU module.
Write the file to the control system CPU module.
Write the file to the standby system CPU module.
*1
Perform the remote RUN to the standby system CPU module.
Perform the remote RUN to the control system CPU module.
Clear the error in the standby system CPU module. *2
End
A continuation error occurs in the
standby system CPU module.
) to SD50 then turn on SM50 to
H