APPLICATION-SPECIFIC FUNCTION: WAIT SFC STEP

WAIT icon

This function is used to set up a wait 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 time defined by the WAIT TIME parameter has elapsed. At this point, 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 indicates OFF.

The non-connected STEP INPUT 1 or STEP INPUT 2 inputs are at neutral values for the function, ie. no token present in the step input.

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For more information about SFC charts and this function, see: SFC chart help