Cameron Scanner 2000 microEFM, Руководство пользователя по оборудованию

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C-1
Scanner
®
2000 microEFM Appendix C
Appendix C—Scanner 2000 for F
oundation
™ Fieldbus
Overview
The NuFlo™ Scanner
®
2000 microEFM for F
oundation
™ Fieldbus communicates via both RTU Modbus
®
and H1 fieldbus protocol. The device computes volumes of gas, liquid and steam using a differential pressure
or pulse output from a primary metering device and makes the data available for download via Modbus
®
communications. The device is CSA approved for Class I, Div. 1 installations.
When properly configured, the device converts values from predefined Modbus
®
process variable registers to
F
oundation
™ fieldbus signals for use in building fieldbus control strategies. Additionally, other input values,
flow volumes, and calculations can be read by a fieldbus host and recorded. For a complete list of parameters
supported by the device, see the F
oundation
™ Fieldbus Protocol Manual for Scanner 2000.
The Modbus
®
to F
oundation
™
fieldbus conversion is made possible by an integrated fieldbus module. The
module is connected to the Scanner 2000 main circuitry by way of a second “interface” board which receives
the power/communications input from the fieldbus network, and facilitates communications between the main
board and the fieldbus module. The three boards, a switchplate with display, and a lithium battery pack are
housed inside a compact aluminum alloy enclosure.
A customer-supplied fieldbus power supply is the primary power source. However, should the primary power
supply be lost, the lithium battery pack independently powers the unit to sustain data collection.
Static pressure and differential pressure inputs are supplied via an integral multi-variable transmitter. The
Scanner 2000 also supports inputs for process temperature (RTD) and turbine signals, a digital output, and an
optional external communications adapter. For a complete list of specifications, see Table 1.1, page 14 .
The Scanner 2000’s Modbus
®
parameters are configured using ModWorX Pro, a full-featured software
application supplied with every Scanner 2000 shipment, providing on-screen tools for configuring hardware
and flow calculations, calibrating inputs, and collecting and viewing flow history. Basic settings can also be
changed using the keypad on the front of the instrument. See Configuration via Keypad, page 70 , for details.
Fieldbus communications are configured using a customer-supplied configuration tool. See Fieldbus
Configuration, page C-9 , for instructions on configuring F
oundation
™ fieldbus parameters.
Note The Scanner 2000 for F
oundation
™ Fieldbus will be referred to as simply Scanner 2000 throughout
this appendix.