Chapter 6 Instruction Details
XBC E-Type Main Unit
6-64
Ver. 1
6.16 Non-process Instruction
6.16.1 NOP
Instruction
Area Available
Step
Flag
P M K F L T C S Z D.x R.x
Co
nst.
U N D R
Error
(F110)
Zero
(F111)
Carry
(F112)
NOP
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
No Ladder Symbol. (used only in Mnemonic)
1) NOP
(1) It means No Operation Instruction which has no effect on operation result of applicable circuit until then.
(2) Only used in Mnemonic Program.
(3) NOP is used to debug sequence program and to clear instruction while keeping the number of steps
temporarily.
2) Program Example
(1) Where steps are increased if Mnemonic Program is changed to Ladder Program with NOP Instruction used.
[Mnemonic Program]
Step
Mnemonic
Operand
0
LOAD
P00020
1
AND
P00021
2
NOP
3
OUT
P00006
4
LOAD
P00022
5
OUT
P00061
6
END
[Ladder Program]
( )
P00006
P00020
( )
P00061
P00022
END
P00021
00000
00004
00006
NOP not displayed
Number of steps identical of that of Mnemonic program
Remark
1) Instruction process time of NOP Instruction differs based on unit type. However, the program process
time (Scan time) can be reduced by clearing the instruction which needs time to process.
2) NOP Instruction can not be input from Ladder, and NOP registered in Mnemonic will not be displayed
on the Ladder screen but the number of steps displayed as included.
Summary of Contents for XBC-DN10E
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Page 10: ...Table of Contents Table of Contents 6 10 10 CLEAR ALL PLC 29...
