EDS84DMOTPBUS EN 3.0 - 11/2011 L 51
Communication manual 8400 motec PROFIBUS
Parameter data transfer
PROFIdrive parameter data channel (DP-V1)
9.3 PROFIdrive parameter data channel (DP-V1)
Data communication with PROFIBUS DP-V0 is characterised by cyclic diagnostics and cyclic
process data and parameter data transfer.
An optional service extension is the acyclic parameter data transfer of PROFIBUS DP-V1 (in
preparation). This service does not impair the functionality of the standard services under
PROFIBUS DP-V0.
PROFIBUS DP-V0 and PROFIBUS DP-V1 can be operated simultaneously in the same
network. This enables the step-by-step expansion or modification of a system.
The services of PROFIBUS DP-V1 can be used by the class 1 master (PLC) and the class 2
master (diagnostics master, etc.).
The integration of the acyclic service into the fixed bus cycle depends on the corresponding
configuration of the class 1 master:
With configuration, a time slot is reserved.
Without configuration the acyclic service is appended when a class 2 master acyclically
accesses a DP-V1 slave.
Features
Parameter number and subindex addresses with a width of 16 bits each.
Several parameter requests can be combined to one request (multi-parameter
request).
There is always only one parameter request in process (no pipelining).
A parameter request/response must fit into a data block (max. 240 bytes). Requests/
responses cannot be split into several data blocks.
No spontaneous messages are transferred.
There are only acyclic parameter requests.
Profile-specific parameters can be read independently of the slave state.
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