Design a sequential function chart
Rockwell Automation Publication 1756-PM006I-EN-P - February 2018 51
This figure shows one way to nest an SFC. In this method, the last scan option of
the SFC is configured for either Programmatic reset or Don’t Scan. If you
configure the SFC for Automatic reset, then step 1 in is unnecessary.
Reset the nested SFC.
• The SFR instruction restarts SFC_b at SFC_b_Step_1. Each time SFC_a leaves this step and then returns,
you have to reset SFC_b.
• The action also clears the X bit of the stop element.
Call SFC_b.
Stop SFC_b. This sets the X bit of the stop element.
Use the X bit of the stop element to signal that SFC_b is done and it is time to go to the next step.
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