Precautions - Mitsubishi Electric MELSEC iQ-R Series User Manual

Precautions

The following are the precautions for the memory copy function.
Restrictions
■Restrictions on memory copy execution
Do not execute the memory copy in the following cases.
• The CPU module of the standby system is powered off or being reset.
• The initial processing (when switched to RUN) is being performed.
• The tracking cable has an error or is not connected.
• The redundant function module has an error.
• The two systems cannot perform communications via the redundant function module.
• The model of the CPU module in the control system differs from that of the CPU module in the standby system.
• An online operation is being performed by the engineering tool.
• The systems are being switched.
• A module (a redundant function module or any module of the standby system) is being changed online.
• The CPU module is being backed up. (CPU module data backup/restoration function)
• The redundant system is in separate mode. (Restriction for the auto memory copy)
• The CPU module is set as the standby system.
• The memory copy is being executed.
• A value other than 03D1H is stored in SD1653. (Restriction for the memory copy using the special relay and special
register)
• The CPU module of the control system to which the program restoration information is not written has executed the
memory copy to the CPU module of the standby system that does not support the program restoration information write
selection.
• A label in the CPU module of the standby system is being accessed from an external device.
■Restrictions during memory copy execution
Do not execute the following operations during memory copy execution.
• Online operation from the engineering tool
• RUN/STOP/RESET switch operation
• Removing the SD memory card
• Online module change
• Backing up the CPU module (CPU module data backup/restoration function)
• Powering off or resetting the systems
• Disconnecting tracking cables
Whether to delete files before memory copy
When memory copy is performed, the CPU module of the standby system may detect a stop error because the files are
deleted from the memory of the CPU module of the standby system to which the data is copied. When a stop error has
already occurred in the standby system, no error is detected. The files in the memory to execute memory copy for are deleted,
and the files in the memory not to execute memory copy for are not deleted.
When the firmware version of the CPU module is "20" or later, even if the files before copying are deleted, the files in or lower
than the system folder ($MELPRJ$) which is not applicable to memory copy is not cleared.
26 REDUNDANT FUNCTION
26.4 Memory Copy from Control System to Standby System
26
411