Approvals And Certifications - Danfoss VLT Midi Drive FC 280 Programming Manual

Introduction
1 1
Cyclic/acyclic communication
•
PLC communicates with telegrams of constant
length.
•
Fits time-critical requirements.
•
Cyclic transmission via PPO types.
•
Extended diagnosis.
Illustration 1.1 PROFIBUS DP-V0
Features of a master class 1 connection:
•
Cyclic data exchange (DP-V0).
•
Acyclic read/write on parameters.
•
Extended diagnosis.
The acyclic connection is fixed and cannot be changed
during operation.
Features of a master class 2 connection:
•
Initiate/abort acyclic connection.
•
Acyclic read/write on parameters.
The acyclic connection can be established (initiated) or
removed (aborted) dynamically even when a master class 1
is active on the network. Use the DP-V1 acyclic connection
for general parameter access as an alternative to the PCV
parameter channel.
4
PROFIBUS DP
PLC
Danfoss A/S © 05/2016 All rights reserved.
PLC
Master class 1
Illustration 1.2 PROFIBUS DP-V1
The PROFIBUS DP extension DP-V1 allows acyclic as well as
cyclic data communication. This feature can be used by a
DP master class 1, for example PLC, as well as a DP master
class 2, for example PC tool.

1.5 Approvals and Certifications

More approvals and certifications are available. For more
information, contact a local Danfoss partner.
PC tool
Master class 2
MG07F102