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164

/FX

3UC

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

6 What to Understand before Programming

6.2 Cautions on Creation of Fundamental Programs

6.2

Cautions on Creation of Fundamental Programs

This section explains cautions on programming.

6.2.1

Programming procedure and execution order

1. Contact configuration and steps

Even for a sequence circuit offering a same operation, the program can be simplified and the number of steps can be
saved depending on the contact configuration method.
1) It is recommended to write a circuit with many serial contacts in an upper position.

2) It is recommended to write a circuit with many parallel contacts in a left position.

2. Program execution and programming order

A sequence program is executed "from top to bottom" and "from left to right".
Code the sequence instruction list according to this rule.

(1)LD

(2)LD (3)AND

(5)OUT

(4)ORB

(1)LD

(3)OR

(2)AND

(4)OUT

ORB instruction is not necessary

(1)LD

(3)OR

(5)OUT

(4)ANB

(2)LD

(1)LD

(2)OR

(3)AND

(4)OUT

ANB instruction is not necessary

(3)

(1)

(2)

(4)

(7)

(5)

(6)

(8)

(9)

(10)

(11)

Executed