Mitsubishi Electronics FX3G User Manual

200

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

7 Basic Instruction

7.6 ORB

7.6

ORB

Outline

A circuit in which two or more contacts are connected in series is called serial circuit block.

1. Instruction format

2. Applicable devices

Explanation of function and operation

1. ORB instruction (parallel connection of multiple contact circuits)

When connecting serial circuit blocks in parallel, use LD or LDI instruction at the start of branch, and use ORB
instruction at the end of branch.
ORB instruction is an independent instruction not associated with any device number in the same way as ANB
instruction described later.
When there are many parallel circuits, ORB instruction can be used for each circuit block to connect them.

Caution

There is no limitation in the number of parallel circuits which can be connected by ORB instructions (in the case of
appropriate program shown above).
Though ORB instructions can be used at one time, note that the repeated use of LD or LDI instruction is limited to 8 or
less (in the case of inappropriate program shown above).

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

" "

ORB

There are no applicable devices.

ORB

OR Block

Basic Instruction

1 step

ORB

−

Continuous

Operation
Pulse (Single)

Operation

Mnemonic

Operation Condition

Circuit program

List program

X000

X001

Y006

X002

X003

X004

X005

Serial circuit block

Appropriate program
0000 LD

X000

0001 AND X001
0002 LD

X002

0003 AND X003
0004
0005 LDI

X004

0006 AND X005
0007
0008 OUT Y006

ORB

Inappropriate program
0000 LD

X000

0001 AND X001
0002 LD

X002

0003 AND X003
0004 LDI

X004

0005 AND X005
0006
0007
0008 OUT Y006

ORB
ORB

ORB instruction