From the course: Learning PLC Ladder Logic: 1 The Basics

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Multiple outputs

Multiple outputs - Ladder Logic Tutorial

From the course: Learning PLC Ladder Logic: 1 The Basics

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Multiple outputs

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- [Instructor] In run operation now we are going to learn how to program the ladder logic when we have multiple outputs. The case of having two lights for example. Outputs are placed in the right hand side of the ladder logic. Multiple outputs are preferred to be programmed in parallel. So, if you have multiple outputs associated with the same input then put them in parallel. Having multiple outputs in series is not a preferred in ladder logic because, as you know by now, in each run the continuity starts from left to right one by one. So if you have an example of having two motors to start when the pushbutton is pressed if we add them in series then motor one has to start for motor two to start. So, if for any reason, motor one could not start then motor two will not work because it depends on the previous instruction. However, if the outputs are added in parallel then they both will be activated, and if one of them is not working that will not affect the other motor, and we can have…

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