PanaFlow™ LC User’s Manual
139
Appendix H. Foundation Fieldbus Communication
Appendix H. Foundation Fieldbus Communication
H.1 Introduction
Fieldbus
is a bi-directional digital communication protocol for field devices, which offers an advancement in
technologies for process control systems and is widely employed by numerous field devices.
The
XMT1000 FF
option is designed to the specification standardized by the
Fieldbus Foundation
, and provides
interoperability with devices produced by other manufacturers. The Fieldbus option
PCB
comes with
software consisting of five
AI
function blocks and one
PID
function block.
Note:
For more general information on other features, engineering, design, construction work, startup and
maintenance of Fieldbus, refer to
Fieldbus Technical Information (TI 38K3A01-01E)
.
H.2 Installation
H.2.1 Network Configuration
The following instruments are required for use with Fieldbus devices:
•
Power supply:
Fieldbus requires a dedicated power supply. It is recommended that current capacity be
well over the total value of the maximum current consumed by all devices (including the host).
Conventional DC current cannot be used as is.
•
Terminators:
Fieldbus requires two terminators. Refer to the supplier for details of terminators that
are attached to the host.
•
Field devices:
Connect the field devices necessary for instrumentation. XMT1000 has passed the
interoperability test conducted by the Fieldbus Foundation. To properly start Fieldbus, use devices
that satisfy the requirements of the above test.
•
Host:
Used for accessing field devices. A dedicated host (such as DCS) is used for an instrumentation line while
dedicated communication tools are used for experimental purposes.
H.2.2 Polarity
The XMT1000 Foundation Fieldbus terminals are marked (+) and (-). However, the design is polarity
insensitive. This means the XMT1000 will communicate even if the connections are reversed.
Содержание Baker Hughes PanaFlow LC XMT1000
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