ProSoft Technology MVI56-AFC - Manual (Page 176)

MVI56-AFC Backplane Communication MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 176 of 316 ProSoft Technology, Inc.
February 25, 2011
Input Function Block ID
Function Block Name: Meter Process Variables
Function Block ID: 8 decimal, 001000 binary, 8192 dec.
Target: Selected Meter Number
Data Block Length: 11 Elements
Total Block Length: 12 Elements
Description
This block provides fresh values of the process inputs to and returns results from
the latest meter calculation scan. The meter is scanned continuously; therefore
several calculations may occur between applications of this block. Process inputs
in the output block are meaningful depending on configuration. For example, the
fourth input is seen as differential pressure, pulse count, flow rate, or ignored
depending on the meter type; the water content is meaningful only for liquids.
The input block always returns an alarm indicator as part of the block ID; the
remaining 11 words are freely selectable from the entire meter database, with the
default selection including detailed alarms, net volume accumulator, net volume
flow rate, correction factors, and intermediate values depending on configuration.
The Meter Process Variable Block must be set up for one of the following meter
types:
Orifice (Differential) Meter with Gas Product
Pulse (Linear) Meter with Gas Product
Orifice (Differential) Meter with Liquid Product
Pulse (Linear) Meter with Liquid Product
Flow Rate Integration with Gas Product
Pulse Frequency Integration with Gas Product
Flow Rate Integration with Liquid Product
Pulse Frequency Integration with Liquid Product