1 general network specification – Flowserve MX/QX Profibus DP/PA Field Unit User Manual

Page 10

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12

Figure 1.2 – Typical PROFIBUS PA Network with DCS or PLC as the Host System

Actuator

Point to Point

Bus with spurs (or drops)

Daisy Chain

Tree

Junction Box

PROFIBUS PA
Interface

Control Highway

Distributed Control
System (Host)

Power for the fieldbus

devices and cable shield

grounding are discussed

in Sections 2.4 and 2.5.

1.5.1 General Network Specification

System Specifications:
• Communicates using the PROFIBUS DP or PROFIBUS PA protocol.
• PROFIBUS DP is V1 compliant.
• Employs high-speed communication.
• Complies with EN50170 fieldbus standard.
• PA Physical Layer with IEC1158-2.
• DP Physical Layer with RS-485.

Network Specification:
Several topologies are available including point-to-point, bus, tree, ring, or a combination of these.
Network features include:

• PROFIBUS DP high-speed communications up to 1.5 Mbit/sec.
• PROFIBUS PA communications are 31.25kbits/sec (segment coupler side).
• Master/slave communications.
• Multiple-master network systems.
• Redundant PROFIBUS DP with single or multiple-master communications.

MX/QX Field Unit Specification:
The field unit mounts inside the actuator, is software controlled, and has the following features:

• Input and Output Function Blocks.
• Device descriptions – describes device and parameters.
• Network communication – compliant with EN50170.
• Configurable by user – locally and via network.