File Register (R/Zr); Specification Method - Mitsubishi Electric MELSEC iQ-R Series User Manual

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File Register (R/ZR)

This device is a word device for extension. This device is specifically a file register file which exists in the file storage area on

the device/label memory.

There are two types of the specification methods for the file register: block switching and serial number methods.

Block switching method

In this method the number of points of file register being used is specified by being divided in increments of 32K point (R0 to

R32767). When using more than one block, specification is conducted by switching to the block number used by the RSET

instruction. "R" is used as the device symbol. The range of "R" is from R0 to R32767. However in the following cases the

upper limit of the device number is "block size (unit: word) -1".

• The file register file size is smaller than 64K bytes.

• The file register file size is not a multiple of 64K bytes and the end block is specified in the RSET instruction.

Serial number method

In this method file registers having more than 32K points are specified using serial device numbers. File registers of the

multiple blocks can be used as consecutive file registers. "ZR" is used as the device symbol. The range of ZR is from ZR0 to

(file register file size (unit: word) -1).

27.9 File Register (R/ZR)

Specify R0 of

the block 1.

Specify R0 of

the block 2.