Mitsubishi Electric MELSEC-Q/L - Operation Processing with Standard Device Registers (Z) (Universal Model QCPU and LCPU Only)

3 CONFIGURATION OF INSTRUCTIONS
3.5 Reducing Instruction Processing Time
109
3
Instructions for which subset processing can be used
Operation processing with standard device registers (Z)
(Universal model QCPU and LCPU only)
Operation processing time can be reduced with standard device registers (Z).
The following shows an example program with standard device registers.
Operation processing time is reduced with the instructions that the subset processing is possible.
For the number of steps, refer to Page 118 Counting Step Number.
For the operation time for each instruction, refer to Page 883 Operation Processing Time.
Because standard device registers are the same devices as index registers, do not use device numbers of the
standard device registers for the index registers.
Types of instructions Instruction symbol
Contact instructions LD, LDI, AND, ANI, OR, ORI, LDP, LDF, ANDP, ANDF, ORP, ORF, LDPI,
ANDPI, ANDFI, ORPI, ORFI
Output instructions OUT, SET, RST
Comparison operation instructions =, <>, <, <=, >, >=, D=, D<>, D<, D<=, D>, D>=
Arithmetic operation +, -, *, /, INC, DEC, D+, D-, D*, D/, DINC, DDEC, B+, B-, B*, B/, E+, E-, E*, E/
Data conversion instructions BCD, BIN, DBCD, DBIN, FLT, DFLT, INT, DINT
Data transfer instructions MOV, DMOV, CML, DCML, XCH, DXCH, FMOV, BMOV, EMOV
Program branch instructions CJ, SCJ, JMP
Logic operations WAND, DAND, WOR, DOR, WXOR, DXOR, WXNR, DXNR
Rotation instructions RCL, DRCL, RCR, DRCR, ROL, DROL, ROR, DROR
Shift instructions SFL, DSFL, SFR, DSFR
Data processing instructions SUM, SEG
Structure creation instructions FOR, CALL
+ D0 D10 D20
+Z0Z1Z2
Using data registers takes three steps and the operation processing time of
28.5 ns. (With the Q26UDEHCPU)
Using standard device registers instead of data registers takes one step and the
operation processing time of 9.5 ns. (With the Q26UDEHCPU)