xLadder user manual-V2.0.0.6

5.8 PLC operation and options

Elements of the control program

Ladder Program

In the LAD program, the basic elements of the logic are represented by contacts, coils,

and boxes.

The input is represented by a symbol called a contact.Contact is divided into normally

open contact and normally closed contact.

Normally open contact: a contact that is open in nature.

Normally closed contact: a contact that is closed in nature.

The output is represented by a symbol called a coil.

The blocks are function blocks with various functions.The blocks can make

programming easier.

STL program

The STL program elements are represented by instructions.Ladder diagram and

instructions are as follows:

System blocks configuration

Instructions : The detailed annotation of operation interface --- > System blocks

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