Chapter 14 PLC Function
|
C200 Series
14-38
Command code:
Operation:
LD
X0
Load contact A of X0
PLF
M0
M0 falling-edge output
LD M0
Load contact A of M0
SET
Y0
Y0 latched (ON)
Example
Ladder diagram:
X0
M0
PLS
M0
Y0
SET
Timing Diagram:
X0
M0
Y0
Time for one scan cycle
Mnemonic Function
END
Program End
Operand
None
It needs to add the END command at the end of ladder diagram program or
command program. PLC will scan from address o to END command, after the
execution it will return to address 0 and scan again.
Mnemonic Function
NOP
No action
Operand
None
NOP command does no operation in the program; the result of executing this
command will remain the logic operation. Use NOP command if user wants to delete
certain command without changing the length of the program.
Command code:
Operation:
LD X0
Load contact B of X0
NOP
No function
OUT Y1
Drive Y1 coil
Example
Ladder diagram:
X0
Y1
NOP
NOP command will be simplified and not
displayed when the ladder diagram is
displayed.
Mnemonic Function
INV
Inverse operation result
Operand
None
The operation result (before executing INV command) will be saved inversely into
cumulative register.
Command code:
Operation:
LD
X0
Load contact A of X0
INV
Operation result
inversed
Example
Ladder diagram:
X0
Y1
OUT Y1
Drive
Y1
coil
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