Rockwell Automation T80004 Application Note Field Loop Configuration - Manual (Page 42)

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AN-T80004 Field Loop Configuration
Issue 10 Jun 13 AN-T80004 42
The pulse width bias factor is used when the valve moves faster in one direction than the other for the
same pulse width. It has the following effect on the output.
Bias factor = 1.0 Mark-space ratio = IO input
Bias factor < 1.0 ‘Closing’ pulse ratio is multiplied by bias factor. ‘Opening’ pulse ratio is
unaffected.
Bias factor > 1.0 ‘Opening’ pulse ratio is divided by bias factor. ‘Closing’ pulse ratio is
unaffected.
A bias factor of 2 will result in an opening output pulse width of 50% for an input of 100%. A bias factor
of 0.5 will result in a closing output pulse width of 50% for an input of -100%.
The function block is available from ICS Triplex Technology. Contact [email protected].