ProSoft Technology MVI56-PDPMV1 - Manual (Page 201)

MVI56-PDPMV1 ♦ ControlLogix Platform Reference
PROFIBUS DPV1 Master User Manual
ProSoft Technology, Inc. Page 201 of 255
March 22, 2011
5.2 About the PROFIBUS Protocol
PROFIBUS (Process Field Bus) is a widely-used, open-standards protocol
created by a consortium of European factory automation suppliers in 1989.
PROFIBUS is a Master/slave protocol. The Master establishes a connection to
one or more remote slaves. When the connection is established, the Master
sends the PROFIBUS poll messages (called telegrams in PROFIBUS) to the
slave or slaves. The MVI56-PDPMV1 module works as a Master only. It cannot
be a slave to some other Master.
The MVI56-PDPMV1 module also acts as an input/output module between
devices on a PROFIBUS network and the Rockwell Automation ControlLogix
processor. The module uses an internal database to pass data and mailbox
requests and responses between the processor and the slave devices on the
PROFIBUS network.
PROFIBUS specifications include a variety of network types. The network type
supported by the MVI56-PDPMV1 module is PROFIBUS DP version 1.0, which is
designed for remote I/O systems, motor control centers, and variable speed
drives.
5.2.1 PROFIBUS DP Architecture
The PROFIBUS DPV1 network supports multiple Master systems with several
slaves.
The following table shows the most important features of PROFIBUS DPV1:
Standard EIN 501 70
DIN 19245
Transmission equipment (Physical) EIA RS-485
IEC 1158-2 (through link or coupler)
Fiber Optic Cable (not available)
Transfer procedure Half-duplex
Bus topology Linear bus with active bus termination
Bus cable type Shielded twisted pair conductors
Connector 9-pin D-Sub
Number of nodes on the bus Max: 32 with no repeaters
Max: 125 with 3 repeaters in 4 segments
5.2.2 Bus Access
Two different bus access procedures handle the various communication
requirements for the PROFIBUS DPV1 topology:
Token Passing
Polling