Rockwell-automation Logix5000 Controllers Sequential Function Charts P User Manual download pdf (Page 35)

Design a sequential function chart Chapter 1

Description

Step becomes inactive.

X bit turns off.

Timer retains its value.

AlarmHigh stays on. (You have to manually turn it off.)

Example

Here is an example of the use of the Preset time of a step. The functional specification has these requirements.

1. Cook the ingredients in the tank for 20 seconds.

2. Empty the tank.

Example

Here is an example of the use of the high alarm of a step. The functional specification has these requirements.

1. Home 8 devices.

2. If all 8 devices are not home within 20 seconds, then shutdown the system.

When the SFC leaves a step, you have several options on how to turn off devices

that the step turned on.

Turn off a device at the end

of a step

Rock well Automati on Publication 1756-PM006F-EN-P - Oct ober 2014 35

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P User Manual Page 35