Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 196)

Publication 1757-UM006A-EN-P - May 2002
A-16 Standard Function Block Parameters
Table A.43 FF_SCALE
Table A.44 FF_VAL
Table A.45 FIELD_VAL
Classification Record
Description Defines the feed-forward input high and low scale values, engineering units
code, and number of digits to the right of the decimal.
FF Data Type DS-68
Range 0-100 percent
Usage C/Scaling
Length 11
Valid Views VIEW_4
Storage Static
Remarks The Data type consists of data that describes floating point values for display
purposes. It uses the following four elements.
• Engineering Units at 100 percent
• Engineering Units at 0 percent
• Units Index
• Decimal Point
Classification Record
Description Represents the feed-forward value.
FF Data Type DS-65
Usage I/Input
Length 5
Valid Views VIEW_3
Storage Non-Volatile
Remarks Read Only
The Data type consists of the value and status of floating point parameters
that are Inputs or Outputs. It uses the following two elements.
• Status
• Value
Classification Record
Description Represents the raw value from the field device in percent of transducer span,
with a status reflecting the transducer condition, before signal characteriza-
tion (L_TYPE) or filtering (PV_FTIME).
FF Data Type DS-65
Usage C/Contained
Length 5