FSTEP_PL7_DRUM : Forcing a drum to a step

Description of the function

The FSTEP_PL7_DRUM function positions the drum selected at a defined step.

The additional parameters and can be configured.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

LD Step_value

FSTEP_PL7_DRUM Drum_instance

Representation in ST

Representation:

FSTEP_PL7_DRUM (Step_value, Drum_instance);

Description of parameters

The following table describes the input parameters:

Parameter	Type	Comment
Step_value	INT	Value of 0 to LEN-1 of the step to be forced. LEN = Drum step number
Drum_instance	PL7_DRUM	Instance of the drum on which the function applies.

Execution errors

If the number of the step transmitted does not exist (number higher than or equal to the step number of the drum), the %S18 bit is set at 1.

EN stands for ENable; it is an optional block input. When the EN input is enabled, an ENO output is set automatically.

If EN = 0, the block is not enabled; its internal program is not executed, and ENO is set to 0.

If EN = 1, the block's internal program is run and ENO is set to 1. If an error occurs, ENO is set to 0.

If the EN input is not connected, it is set automatically to 1.

ENO

ENO stands for Error NOtification; this is the output associated with the optional input EN.

If ENO is set to 0 (because EN = 0 or in case of an execution error):

the status of the function block outputs remains the same as it was during the previous scanning cycle that executed correctly;
the output(s) of the function, as well as the procedures, are set to "0".