Download downloaded

Chapter 4 PLC Function Instructions
Some functions are completed by function instructions instead of basic ones. The function instructions in the
system are as follows:
Instruction
name
Function
Instruction
name
Function
END1
End of grade one program
ROTB
Binary rotation control
END2
End of grade two program
DECB
Binary decoding
SET
Set
CODB
Binary code conversion
RST
Reset
JMPB
Program jumping
CMP
Comparative set
CTRC
Counter
TMRB
MOVN
LBL
Program jumping label
CALL
Subprogram calling
Timer
SP
Start of subprogram
Binary Data copy
SPE
End of subprogram
Parity check
DIFU
Ascending edge set
ADDB
Binary data adding
DIFD
Descending edge set
SUBB
Binary data subtracting
PARI
ALT
MOVE
And
Alternative output
4.1 END1（END of GRADE ONE PROGRAM）
● Instruction function
There must be END1 in the sequential program one time, located at the end of grade one program. It should be
located at the home of the second when there is no grade one program.
● Ladder format
4.2 END2（END of GRADE TWO PROGRAM）
● Instruction function
There must be END2 at the end of grade two program which representing end of grade two program.
● Ladder format
Ⅳ-1
Book 1 Programming
Chapter 4 PLC FUNCTION INSTRUCTIONS