Mitsubishi Electric MELSEC-Q00U(J)CPU

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CHAPTER 4 DEVICES
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4.6 Index Register (Z)/Standard Device Resister (Z) 4.6.2 Standard device register (Z)
4.6.2 Standard device register (Z)
By using the index register between register operations, operations can be executed at a higher speed.
The index register used in this case is called the standard device resister.
(1) Device number
Since the standard device register is the same device as the index register, pay attention not to use the same
device number when using the index modification.
Remark
For operation processing and processing time of the standard device register, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)