Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 42)

Chapter 1 Design a sequential function chart

How do you want to control the device?

To provide bumpless control of a device during more than one time or phase

(step), do one of the following options.

Option Example

Use a simultaneous branch on page 42

Make a separate step that controls the device.

Store and reset an action on page 43

Note the step that turns on the device and the step that turns off the device.

Later, define a Stored and Reset Action pair to control the device.

Use one large step on page 44

Use one large step that contains all the actions that occur while the device is on.

Use a simultaneous branch

A simple way to control a device or devices during one or more steps is to create a

separate step for the devices. Then use a simultaneous branch to execute the step

during the rest of the process.

Keep something on from

step-to-step

42 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 42