
Appendix D. Foundation fieldbus communication
D.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).
D.2 Installation
D.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.
D.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.
D.2.3 Connection
Connect the fieldbus wires to P1 on the terminal PCB
(see
figure 20
below). Panametrics recommends using the
top right rear port on the enclosure.
IMPORTANT:
Please make sure to follow all local installation guidelines.
P1
Figure 20: FF connection to XMT1000
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