Standard
RLL Instructions
5–94
Standard RLL Instructions
CPU Control Instructions
CPU Control Instructions
The No Operation is an empty (not
programmed) memory location.
NOP
DirectSOFT
Handheld Programmer Keystrokes
NOP
SHFT
TMR
N
INST#
O
CV
P
ENT
The End instruction marks the termination
point of the normal program scan. An End
instruction is required at the end of the
main program body. If the End instruction
is omitted an error will occur and the CPU
will not enter the Run Mode. Data labels,
subroutines and interrupt routines are
placed after the End instruction. The End
instruction is not conditional; therefore, no
input contact is allowed.
END
DirectSOFT
Handheld Programmer Keystrokes
END
SHFT
4
E
TMR
N
3
D
ENT
The Stop instruction changes the
operational mode of the CPU from Run to
Program (Stop) mode. This instruction is
typically used to stop PLC operation in an
error condition.
STOP
In the following example, when C0 turns on, the CPU will stop operation and switch
to the program mode.
DirectSOFT
Handheld Programmer Keystrokes
STOP
C0
STR
$
SHFT ENT
2
C
0
A
SHFT
RST
S
MLR
T
INST#
O
CV
P
ENTSHFT
Discrete Bit Flags Description
SP16 On when the DL05 goes into the TERM_PRG mode.
SP53 On when the DL05 goes into the PRG mode.
No Operation
(NOP)
End
(END)
Stop
(STOP)
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