Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuale Utente Scaricare il pdf (Pagina 13)

Program ladder diagram Chapter 1

Arrange the input instructions

Determine how to arrange the input instructions on the rung, as shown below.

To check multiple input conditions when: Arrange the input instructions:

• All conditions must be met in order to take action.

For example, If condition_1 AND condition_2 AND condition_3…

In series:

• Any one of several conditions must be met in order to take action.

For example, If condition_1 OR condition_2 OR condition_3…

In parallel:

• There is a combination of the above.

For example:

If condition_1 AND condition_2…

If condition_3 AND condition_2…

In combination:

Tip: The controller executes all instructions on a rung regardless of their

rung-condition-in. For optimal performance of a series of instructions, sequence

the instructions from most likely to be false on the left to least likely to be false on

the right.

When the controller finds a false instruction, it executes the remaining instructions

in the series with their rung-condition-in set to false. Typically, an instruction

executes faster when its rung-condition-in (rung) is false rather than true.

Rockwell Automation Publication 1756-PM008E-EN-P - October 2014 13

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Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuale Utente Pagina 13