Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 7)

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PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
flowserve.com
• Installation Guidelines for PROFIBUS – FMS/DP Version 1.0, PROFIBUS International Order No.
2.112.
• Profibus Installation Guideline For Cabling and Assembly, Version 1.0.6, PROFIBUS International
Order No. 8.022.
• Profibus Installation Guideline For Commissioning, Version 1.0.2, PROFIBUS International Order
No. 8.032.
• Technical Guideline: PROFIBUS PA User & Installation Guideline, Version 2.2, February 2003.
• PROFIBUS Specification - Slave Redundancy Version 1.2, PROFIBUS International Order No. 2.212,
November 2004.
1.5 MX/QX PB System Capabilities and Features
Flowserve Limitorque’s MX/QX PROFIBUS (PB) field unit conforms to the open fieldbus standard
EN50170. It is suitable for use on PROFIBUS and uses a twisted-pair or two-conductor shielded cable
for connection to the network. A PROFIBUS 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.
The MX/QX PB unit may command its actuator to: open, stop, close, move to a set position, perform
an emergency shutdown operation, read and control relays, monitor analog inputs and position,
and monitor modes and alarms. Commands to the unit come over the network from the master
network host station, which may be a Personal Computer (PC), Distributed Control System (DCS),
Programmable Logic Controller (PLC), or some other microprocessor-based device. The master is
defined as an active network node which means that it has addressing, and read and write privileges
to slave devices that are assigned to it.
Additional features and capabilities are:
• The system reduces the cost of wiring and installation by using existing wiring and multi-drop
connections, if it meets PROFIBUS requirements. It is also possible to have more than one
PROFIBUS communication network on the same cabling.
• Multiple-master operations through the use of the PROFIBUS token being passed between masters
(active nodes). Each master has its own set of slaves and may only write to those slaves.
• Master-slave operations where the master, active node, has the right to address, and send or fetch
messages from the slaves (passive nodes).
• The devices are interoperable, as devices from different suppliers communicate with one another
on the same network.
The PROFIBUS communication system supports up to 32 devices per segment, with up to 126
addressable devices with the use of repeaters.
Segmentation is used for the following reasons:
• Isolation is desired between two areas or buildings.
• Media conversion (copper to fiber or fiber to copper) is desired.
• The maximum of 32 nodes has been reached (31 + repeater).
• The maximum distance has been reached.
• It is desirable to “reform” the signal to full voltage levels (noisy environment).