Mitsubishi Electronics FX3G User Manual

218

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

7 Basic Instruction

7.15 END

7.15

END

Outline

END instruction specifies the end of a program.
(Do not write the END instruction in the middle of a program.)

1. Instruction format

2. Applicable devices

Explanation of function and operation

1. END instruction (program end, I/O refresh and return to step 0)

PLCs repeat "input processing

→ program execution → output processing". When END instruction is written at the

end of a program, PLCs immediately execute the output processing without executing steps after END instruction.
If END instruction is not written at the end of a program, PLCs execute the program until the END step, and then
execute the output processing.
At the first execution after the PLC mode is changed from STOP to RUN, PLCs start from END instruction. When END
instruction is executed, the watchdog timer (which checks the operation cycle) is refreshed.

Caution

Do not write END instruction in the middle of a program.
When a program is transferred from a programming tool, all steps after END instruction are replaced with NOP (no
operation) instructions.

Instruc-

tion

Bit Devices

Word Devices

Others

System User

Digit Specification

System User

Special

Unit

Index

Con-
stant

Real

Number

Charac-

ter String

Pointer

X Y M T C S D .b KnX KnY KnM KnS T C D R U \G

V Z Modify K H

" "

END

There are no applicable devices.

END

Basic Instruction

END

−

Continuous

Operation
Pulse (Single)

Operation

Mnemonic

Operation Condition

1 step

Input processing

LD X000

OUT Y000

END

NOP

Output processing

Step 000

001

002