Indirect Designation - Mitsubishi MELSEC QCPU Programming Manual

3 CONFIGURATION OF INSTRUCTIONS

3.4 Indirect Designation

(1) Indirect Designation
(a) Indirect designation is a way of using a word device to designate a device address that will
be used in a sequence program.
This method can be used when the index register is insufficient.
(b) The device which designates the designated device address is designated by
"@+(word device number)".
For example, designation of @D100 will make the contents of D100 D101 the device
address.
(c) The address of the device performing indirect designation can be confirmed with the
ADRSET instruction.
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ADRSET W100 D100
W100 address is stored at D101 and D100
MOV K1234 @D100
Reads the contents of
D100
D0
D1
D100 W100
D101 address
MELSEC-Q/QnA
The value 1234 is
written to the designation
address by D101 and D100
Device area
W100 1234
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