ProSoft Technology MVI56-AFC - Manual (Page 11)

MVI56-AFC ♦ ControlLogix Platform Introduction
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 11 of 316
February 25, 2011
1 Introduction
In This Chapter
 Update Notice ........................................................................................ 12
 MVI56-AFC Module ............................................................................... 14
 Configuration Modification Lockout and Seal ........................................ 15
The MVI56-AFC Flow Computer module performs measurement of hydrocarbon
gases and liquids using currently accepted industry measurement standards. The
module consists of a single-slot solution for Rockwell Automation chassis. To
obtain its process inputs for calculations, the module uses the process data
collected by analog and pulse I/O modules. The processor transfers this data to
the AFC module, which then calculates flow rates, accumulated volumes, and
accumulated mass. The results of the calculations are transferred back to the
processor for use in the application logic, or for transfer to a SCADA host.
The module has two communication ports for Modbus communication allowing
easy access to a remote Modbus device. The module works as a Modbus slave
or master device.
As discussed later in this manual, the internal Modbus database can be
accessed by a Modbus Master device and by the processor (using the Modbus
Gateway Function).
The AFC Manager software can be used for easy meter configuration and
application monitoring. Refer to the AFC Manager User Manual for complete
information about this tool.
The following section provides a sample application where input data is
transferred from the transmitters to analog input cards on the Rockwell
Automation rack and the values are transferred from the processor to the module
(the module supports floating-point, scaled integer, or 4 to 20 mA format).
For Pulse meter applications, the pulse count and pulse frequency values are
typically transmitted through high-speed counter modules in the rack.
The module performs the flow calculation based on the values transferred
through the backplane. The calculation results can be read to the processor or
polled from a remote Modbus master unit connected to one of the communication
ports.