Honeywell Series A User Manual page 387

Description
Function Notes
Equation Options
R400 Experion PKS Series A Fieldbus Interface Module User's Guide
July 2010
The AI function block takes the input data from a
Transducer block and calculates an output to be fed to
other fieldbus function blocks. A functional schematic of the
block is shown in the previous illustration for reference.
Supports Out of Service (OOS), Manual (Man), and
Automatic (Auto) modes.
The XD_SCALE units code must match the channel
units code, or the block will remain in OOS mode after
being configured.
The OUT_SCALE is normally the same as the
transducer, unless the L_TYPE is set to Indirect or Ind
Sqr Root, then the OUT_SCALE determines the
conversion from FIELD_VAL to the output.
If the mode is Auto, the PV is the value the block puts
in OUT.
If the mode is Man, an operator can write a value to
OUT.
The SIMULATE parameter is for testing purposes only
and always initializes in the disabled state.
FIELD_VAL = 100 x (channel value - EU@0%) /
(EU@100% - EU@0%) [XD_SCALE]
Direct: PV = channel value
Indirect : PV = (FIELD_VAL / 100) x (EU@100% -
EU@0%) + EU@0% [OUT_SCALE]
Ind Sqr Root: PV = sqrt(FIELD_VAL / 100) x
(EU@100% - EU@0%) + EU@0% [OUT_SCALE]
Honeywell
10. Appendix A
10.2. Standard Function Blocks
387