Delta CT2000 Series User Manual page 488

Time sequence diagram:
X0
Time for one scan cycle
M0
Y0
Command
END
Program conclusion
Operand
An END command must be added to the end of a ladder diagram program or
command program. The PLC will scan from address 0 to the END command, and will
return to address 0 and begins scanning again after execution.
Command
NOP
No action
Operand
The command NOP does not perform any operation in the program. Because
execution of this command will retain the original logical operation results, it can be
used in the following situation: the NOP command can be used instead of a command
that is deleted without changing the program length.
Ladder diagram:
NOP command will be simplified and not
displayed when the ladder diagram is
displayed.
X0
Command
INV
Inverse of operation results
Operand
Saves the result of the logic inversion operation prior to the INV command in the
cumulative register.
Ladder diagram:
X0
Command
P
Index
Operand
Pointer P is used to subprogram call command API 01 CALL. Use does not require
starting from zero, but the number cannot be used repeatedly, otherwise an
unpredictable error will occur.
Ladder diagram:
X0
X1
P10
Y1
NOP
Y1
CALL P10
Y1
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Chapter 16 PLC Function CT2000 Series
SET Y0
Function
N/A
Function
N/A
Command code:
LD X0
NOP
OUT Y1
Function
N/A
Command code:
LD X0
INV
OUT Y1
Function
P0~P255
Command code:
LD X0
CALL P10
：
P10
Y0 Action continues
(ON)
Description:
Load Contact b of X0
No action
Drive Y1 coil
Description:
Load Contact a of X0
Inverse of operation
results
Drive Y1 coil
Description:
Load Contact a of X0
Call command CALL to
P10
Pointer P10