Flowserve MX FOUNDATION Fieldbus Field Unit - Manual (Page 6)

MX/QX FOUNdaTION Fieldbus Field Unit FCd LMENIM2330-01 – 08/11
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1.5 MX/QX FF System Capabilities and Features
Limitorque’s FOUNDATION fieldbus field unit conforms to the open fieldbus standard IEC 61158.
It is suitable for use on the Fieldbus H1 highway and uses a twisted-pair cable for connection to
the highway. The communication system theoretically supports up to 240 actuators with the use of
repeaters.
The MX/QX FF field unit fits in the actuator in the sealed electrical housing. Adjustments to the
MX/QX FF settings may be made over the FOUNDATION fieldbus data highway using a network
configuration tool.
The MX/QX FF unit may command its actuator and others to:
• Open
• Stop
• Close
• Move to a set position
• Perform an emergency shutdown operation
• Read and control relays
• Perform partial stroke test
• Monitor analog inputs and position
• Monitor modes and alarms
Commands to the unit come over the network from the host system, which may be:
• Personal Computer (PC)
• Distributed Control System (DCS)
• Programmable Logic Controller (PLC)
• Field Device Tool (FDT) w/ Device Type Manager (DTM)
• Some other microprocessor-based device
Commands may also be generated in another network actuator or device and transmitted over
fieldbus using peer-to-peer, consumer/producer communication.
The MX/QX FF also has the capacity of being a Link Active Scheduler (LAS) on a FOUNDATION
Fieldbus network. It can be configured either for Basic or LAS mode. In BASIC mode, the MX/QX will
display COMM LOSS if power is removed from the FF field unit. In LAS mode, the MX/QX will display
HARDWARE FAILURE if power is removed from the FF field unit.
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 capabilties, which allows abnormal conditions to be easily and
immediately identified before an unplanned shutdown.
Additional features and capabilities are:
• The system reduces the cost of wiring and installation – existing wiring and multi-drop connections
can be used
• The devices are interoperable – devices from different suppliers can communicate with one another
on the same network.
A typical MX/QX FF system is shown in Figure 1.1.