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DVP-ES2/SA2/SS2/SA2/SX2/SE Operation Manual - Programming
3-10
Mnemonic Function Program steps
END
Program End 1
Controllers
ES2/EX2 SS2
SA2
SE
SX2
Explanations:
END instruction needs to be connected at the end of program. PLC will scan from address 0 to
END instruction and return to address 0 to scan again.
Mnemonic Function Program steps
NOP
No operation 1
Controllers
ES2/EX2 SS2
SA2
SE
SX2
Explanation:
NOP instruction does not conduct any operations in the program, i.e. the operation result remains
the same after NOP is executed. Generally NOP is used for replacing certain instruction without
altering original program length.
Program example:
Ladder Diagram:
X0
Y1
NOP
NOP instruction will be
omitted in the ladder diagram
Instruction: Operation:
LD X0 Load NO contact X0
NOP
No operation
OUT Y1 Drive coil Y1
Mnemonic Function Program steps
NP
Negative contact to Positive contact 1
Controllers
ES2/EX2 SS2
SA2
SE
SX2
Explanation:
When the conditions preceding NP command change from false to true, NP command (works as
contact A) will be ON for a scan cycle. In the next scan cycle it turns OFF.
Program Example:
Ladder Diagram:
M0 M1
Y0
P
Instruction: Operation:
LD M0 Load NO contact M0
AND M1 Connect NO contact M1 in series
NP
Negative contact to Positive contact
OUT Y0 Drive coil Y0