Restrictions On Using File Registers - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

Restrictions on using file registers

When a file register is specified for the refresh device, note the following restrictions.
When a file register having the same name as a program is specified
If the use of a file register having the same name as a program is specified in the parameter, refresh cannot be performed
correctly. When a file register having the same name of a program is used, data is refreshed by the file register having the
same name of the program that has been set at the final number in the program settings.
To read or write refresh data, use the QDRSET instruction to switch to the corresponding file register and specify it.
If the file name or drive number is changed by the QDRSET instruction
If the file register file name or drive number is changed by the QDRSET instruction, the setting file is linked immediately before
refresh.
To read or write refresh data, specify it in the setting file immediately before refresh.
When the block number is changed by the RSET instruction
When the block number is changed by the RSET instruction, note the following.
• Data is refreshed by the file register (R) of the new block number.
• Data is refreshed by the file register (R) of the block number immediately before refresh.
To read or write refresh data, specify the block number immediately before refresh.
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1.5 Precautions on Programming
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