Flowserve MX FOUNDATION Fieldbus Field Unit Instrukcja Użytkownika Pobierz pdf (Strona 6)

MX/QX FOUNDATION Fieldbus Field Unit FCD LMENIM2330-01 – 08/11

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.

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Flowserve MX FOUNDATION Fieldbus Field Unit Instrukcja Użytkownika Strona 6