Specifications

36
MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
13.2 Network Wiring – Foundation Fieldbus H1
Please refer to LMENIM2330 for detailed installation instructions.
Limitorque’s F
o u n d a t i o n Fieldbus field unit conforms to open Fieldbus standard IEC 61158. It is suit-
able for use on the H1 highway and uses a twisted-pair cable for connection to the highway.
The MX FF field unit fits in the actuator in the sealed electrical housing. All adjustments to the MX FF
settings may be made over the F
o u n d a t i o n Fieldbus data highway using a network configuration tool.
The MX FF unit may command its actuator to open, stop, close, move to a set position, or perform
an emergency shutdown operation. Commands to the unit come over the network from the host
system, which may be a PC, Distributed Control System (DCS), Programmable Logic Controller
(PLC), or some other microprocessor-based device. Commands may also be generated in another
network actuator or device and transmitted over fieldbus using peer-to-peer, publisher/subscriber
communication.
A fieldbus device is an intelligent device within the actuator that can send multiple variables to
the control system over a high-resolution and distortion-free digital communication network. The
device provides control and self-test capabilities, which allow abnormal conditions to be easily and
immediately identified before an unplanned shutdown.
Additional features and benefits are:
Reduces cost of wiring and installation – existing wiring and multi-drop connections can be used.•
Interoperable devices – devices from different suppliers can communicate with one another on the •
same network.
A typical MX FF system is shown in Figure 13.2.
Figure 13.2 – Typical F
o u n d a t i o n Fieldbus System with a DCS Host (Daisy Chain Shown)
Distributed Control
System (Host )
Control Highway
Fieldbus
Inte rf ace
MXFF
Actuator
MXFF
Actuator
MXFF
Actuator
MXFF
Actuator
T erminator
T erminator Fieldbus Network
Fieldbus
Power
Supply
9-32 V