Technical Overview; Bus Topology - Danfoss FC 300 Profibus Manual

FC 300 Profibus

Technical Overview

Bus Topology

Single master
-
PLC communicates with telegrams of constant
length
-
Fits time-critical requirements
-
Cyclical transmission via PPO types
-
Extended diagnosis
Bus Topology
Multiple master
Features of a Master class 1 connection
-
Cyclical data exchange (DP V0)
-
Acyclical read/write on parameters
-
Extended diagnosis
The acyclical connection is fixed, and cannot be
changed during operation.
Features of a Master class 2 connection:
-
Initiate / Abort acyclical connection
-
Acyclical read/write on parameters
The acyclical connection can be established
(Initiate) or removed (Abort) dynamically even
when a master class 1 is active on the network.
The DP V1 acyclical connection can be used for
general parameter access as an alternative to the
PCV parameter channel.
The PROFIBUS DP extension DP V1 permits acyclical as well as cyclical data communication. This feature can
be used by a DP master class 1 (e.g. PLC), as well as a DP master class 2 (e.g. PC tool).
10
Introduction
PROFIBUS DP V0
PROFIBUS DP V1
MG.33.C2.02 - VLT is a registered Danfoss trademark