Fairbanks FB2255 Series Instrument PC2255 PC Software Utility Program - Manual (Page 37)

Section 6: Fieldbus/Bluetooth
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Additionally, the current Fieldbus communications network is replacing the older 4-
20mA Analog Signal.
– The older 4-20 mA analog signal requires each device to have its own set of
wires and its own connection points.
– A Fieldbus eliminates this need as, generally, twisted pair wiring is used.
– All devices on the network are now connected together.
Fairbanks Scales currently offers three different Fieldbus Devices: DeviceNet
™
,
ControlNet
™
, Profibus
®
, and Ethernet/IP.
For more information and EDS files, see http://www.hms.se/default.shtml .
5.2. Fieldbus Connections
The term FIELDBUS usually describes an all-digital two-way communications
system that interconnects measurement and control equipment such as sensors,
actuators and controllers.
The Fieldbus assembly connects to the 32-pin header on the FB2255 main PCB
Assembly.
It is provided with two (2) standoffs which support the
right side of the card.
5.2.1. OVERVIEW OF TERMS
There are currently four (4) different of Fieldbus Interfaces listed as standard
accessories for the FB2550 Instrument.
•
DEVICE NET
™
(29578)
– A network system to interconnect control devices for data exchange.
– It uses a differential serial bus, called Controller Area Network (CAN), as
the backbone technology and defines an application layer to cover a range of
device profiles.
•
CONTROL NET
®
(31979)
– An open control network in real-time, for high-throughput applications.