At Schneider Electric Training Center, we are introduced how to use PLC, especially Twido PLC.
What is Twido?
TwidoSuite is a full-featured, graphical development environment for creating,configuring, and maintaining automation applications for Schneider Electric Twido programmable controllers.
A programmable controller reads inputs, writes to outputs, and solves logic based on a control program. Creating a control program for a Twido controller consists of writing a series of instructions in one of the Twido programming languages.
Twido Languages
The following languages can be used to create Twido control programs:- Instruction List Language:
An Instruction List program is a series of logical expressions written as a sequence of Boolean instructions. A program written in Instruction List language consists of a series of instructions executed sequentially by the controller. The following is an example of a List program.
- Ladder Diagrams:
A Ladder diagram is a graphical means of displaying a logical expression. Ladder diagrams are similar to relay logic diagrams that represent relay control circuits. Graphic elements such as coils, contacts, and blocks represent instructions.The following is an example of a Ladder diagram.
- Grafcet Language:
Grafcet language is made up of a series of steps and transitions. Twido supports the use of Grafcet list instructions, but not graphical Grafcet. The Grafcet analytical method divides any sequential control system into a series of steps, with which actions, transitions, and conditions are associated. The following illustration shows examples of Grafcet instructions in List and Ladder programs respectively.
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