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Updated 2018-10

This command declares a programmable limit switch (PLS) variable.

The declaration specifies the name of the axis and the output associated with the PLS.

The PLS output may be a digital output (SYSTEM.DOUT.x) or a virtual output (SYSTEM.VOUT.x).

After this command is issued, the PLS exists but is disabled. The PLS property <pls>.PLSENABLE is used to enable the PLS.

After PLS is declared, the following default PLS properties are in effect:

  • The initial output polarity is 0.
  • The repetition interval is 0.
  • The hysteresis is 0.
  • A single PLS position set as 0.

These properties can be set explicitly only when the PLS is disabled.


COMMON SHARED <pls> As PLS <axis name> <output> {HWAssistance = 1/0 }


Version 4.1.11 and later


<pls>: string
<axis name>: string


<axis name>: a valid axis name
<output>: the name of a system output. System outputs are specified by

System.DOut.x, for digital outputs, or
System.VOut.x, for virtual outputs.

<HWAssistance>: 1 activates the PLS high accuracy mode

The value x identifies the specific output to be used. It may be explicitly given or it may be an expression. The expression must evaluate to an integer ranging from 1 to 20 for digital outputs or from 1 to 32 for virtual outputs.


Configuration or Terminal

In version 4.5.17 and later, the global (common shared) declaration can also be issued from library or task contexts. In those contexts all three parameters of PLS (axis name, system output and HWassistance flag) can be reassigned while reloading the declaring task or library.


Write only

PLS high accuracy (HWAssistance) is limited to System.DOut from 1 to 8.

HWAssistance requires Digital Logic Pentium III CPU with Altera version 8.7.1


Common Shared Pls1 as PLS x_axis SYSTEM.Dout.4

Common Shared Pls2 as PLS x_axis SYS.Dout.8 HWAssistance = 1

Common Shared Pls3 as PLS x_axis SYS.Dout.3 HWAssistance = 0

See Also