Subset Processing - Mitsubishi MELSEC QS Series Programming Manual

3.3

Subset Processing

Subset processing is used to place limits on bit devices used by basic instructions and
application instructions in order to increase processing speed.
However, the instruction symbol does not change.
To shorten scans, run instructions under the conditions indicated below.
(1) Conditions which each device must meet for subset processing
(a) When using word data
Device
Bit device
Word device
Constants
(b) When using double word data
Device
Bit device
Word device
Constants
(2) Instructions for which subset processing can be used
Types of Instructions
Comparison operation instruction
Arithmetic operation
Data conversion instructions
Data transfer instruction
Logic operations
• Designates a bit device number in a factor of 16
• Only K4 can be designated for digit designation.
• Internal Device
• No limitations
• Designates a bit device number in a factor of 16
• Only K8 can be designated for digit designation.
• Internal Device
• No limitations
Instruction Symbols
• , , , , , , D
• +, , , /, INC, DEC, D+, D , D
• BCD, BIN, DBCD, DBIN
• MOV, DMOV, CML, DCML
• FMOV, BMOV
• WAND, DAND, WOR, DOR, WXOR, DXOR, WXNR, DXNR
Condition
Condition
, D , D , D , D , D
, D/, DINC, DDEC
3.3 Subset Processing
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