SFC STEP FUNCTION (STEP)

This function can be used to set up an operating phase or step for a PLC or a device.
- If a status token is present at STEP INPUT 1 or STEP INPUT 2 it is stored immediately in the function step, switching the STEP OUTPUT to ON.
- This token remains stored in the step until the TRANSITION input changes to the ON state. In this case, the status token crosses the transition and disappears from the step. The STEP OUTPUT is set to OFF and the token is then available on the STEP TRANSITION OUTPUT and can be stored in the step or steps connected downstream of this output.
- If there is no status token present at either input (STEP INPUT 1 and STEP INPUT 2) and if the step does not already contain a status token, the step remains empty and the STEP OUTPUT is set to OFF.
The non-connected inputs are set to neutral values for the function, i.e.:
- The non-connected TRANSITION is maintained in the OFF state: transition blocked
- The non-connected STEP INPUT 1 or STEP INPUT 2 is maintained with no token present in the step input.
Parameterisation box/Comments tab
For more information about SFC charts and this function, see: SFC chart help.
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