ProSoft Technology MVI56-AFC - Manual (Page 224)

MVI56-AFC Sample Logic MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 224 of 316 ProSoft Technology, Inc.
February 25, 2011
12.3.6 Meter Process Variables
In order to perform flow calculation the module must receive the meter process
variables from the processor.
The process variables will depend on the meter type and product group. So the
profile information (discussed before) is used to decide from which controller tag
the variables will be copied from. The following options are used:
Meter Type Product Group Use this Controller Tag
Differential Gas AFC56.Meters[x].Variables.DifferentialGas
Differential Liquid AFC56.Meters[x].Variables.DifferentialLiquid
Linear Gas AFC56.Meters[x].Variables.LinearGas
Linear Liquid AFC56.Meters[x].Variables.LinearLiquid
The following illustration shows an example controller tag from RSLogix5000:
This means that all you have to do is identify where the variables will be copied
from (based on the meter type and product group). The logic will automatically
select the correct controller tags.
Note: In order to configure each meter type and product group, refer to the AFC Manager software
tool.
For each possible combination, the following variables are used:
1) Meter Type = Differential & Product Group = Gas
Process Input Controller Tag Data Type
Temperature AFC56.Meters[x].Variables.DifferentialGas.Temperature REAL
Pressure AFC56.Meters[x].Variables. DifferentialGas.Pressure REAL
Differential
Pressure
AFC56.Meters[x].Variables.
DifferentialGas.DifferentialPressure
REAL
Where x can assume values between 0 and 15.