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1.5 Extended Ladder Diagrams

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Chapter 1 Programming

1.5 Extended Ladder Diagrams

This section describes KEYENCE’s unique extended ladder diagram.

1.5.1 Features of Extended Ladder Diagrams

The extended ladder diagram is a programming method developed to reduce

problems related to design, testing, operation, and maintenance of programs.

In a conventional ladder diagram, output instructions can be written only on the right

side of a ladder diagram. On the other hand, in an extended ladder diagram, output

instructions can be written anywhere except on the left. As the result, the programs

shown below can be written.

Mixture of input and output circuits

Conventional ladder diagram Extended ladder diagram

Connection of two or more instructions on one line

Conventional ladder diagram Extended ladder diagram

Branch from output coil

Conventional ladder diagram Extended ladder diagram

Only input circuits

can be written.

Only output

circuits can

be written.

Only input

circuits can

assembled.

Both input

circuits and

output circuits

can be

assembled.

Only output

circuits can

assembled.

Instructions can be written only from the

left end to the right end on one line.

Many instructions can be connected.

There is only a single line, so the ladder

diagram is easier to understand.

Branches can be made only from input

contacts.

Three lines are required.

Branches can also be made from output

coils.

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