Appendix C Use of Basic Instructions|DOP-EXIO Series
Revision March, 2008, Doc. Name: 2007PDD23000014 C-13
Timing Diagram:
1 scan time
X0
M0
Y0
Mnemonic Functions
END
Program End
Operand None
Explanations:
END instruction has to be placed in the end of a ladder diagram or instruction program. DOP-EXIO
series will start to scan from address 0 to END instruction and return to address 0 to restart the scan.
Program Example:
Ladder diagram: Instruction code: Operation:
LD X0
Loading in B contact of X0
AND X1
Series connecting A contact of X1
OUT Y1
Driving Y1 coil
X0 X1
Y1
END
END
Program end
Mnemonic Functions
NOP
No Operation
Operand None
Explanations:
NOP instruction does not conduct any operations in the program; therefore, after the execution of NOP,
the existing logical operation result will be kept. If the user wants to delete a certain instruction without
altering the length of the program, the user can use NOP instruction. If the user wants to delete a
certain instruction temporarily, the user can also use NOP instruction.
Program Example:
Ladder diagram: Instruction code: Operation:
LD X0 Loading in B contact of X0
NOP No operation
X0
Y1
NOP
NOP instruction will be
omitted in the ladder diagram
OUT Y1 Driving Y1 coil
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