PLC ladder diagram design six principles - Database & Sql Blog Articles

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1. Contact arrangement

The contacts of the ladder diagram should be drawn on a horizontal line and not on a vertical branch.

2. Serial and parallel processing

When several series circuits are connected in parallel, the series circuit with the most contacts should be placed at the top of the ladder diagram. When several parallel circuits are connected in series, the parallel circuit with the most contacts should be placed on the leftmost side of the ladder diagram.

3. Coil arrangement

The contact cannot be drawn to the right of the coil and the coil can only be connected to the right of the contact.

4. No double coil output

If the coil of the same component is used two or more times in the same program, it is called a double coil output. At this time, the previous output is invalid, and only the last time is valid, so the double coil output should not appear.

5. Reprogramming the circuit

If the circuit structure is more complicated, it is easier to re-use some contacts to draw its equivalent circuit and then program it.

6. Programming order

For complex programs, the program can be divided into several simple blocks. Each segment starts from the leftmost contact, is programmed from top to bottom, and then connects the program piece by piece.

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