ProSoft Technology PTQ-AFC - Manual (Page 14)

Start Here PTQ-AFC ♦ Modicon Quantum Platform
User Manual Liquid and Gas Flow Computer for Hydrocarbon Products
Page 14 of 259 ProSoft Technology, Inc.
June 23, 2011
1.1 Introduction
The PTQ-AFC Gas & Oil 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 Quantum 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 ladder 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.
The following section provides a sample application where input data is
transferred from the transmitters to analog input cards on the Schneider Electric
rack and the values are transferred from the processor to the module.
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.