Lenze i55AE155F

9.6.10 Parameter data transfer
Data communicaon with PROFIBUS DP-V0 is characterised by cyclic diagnoscs and cyclic
process data transfer. An oponal service expansion is the acyclic parameter data transfer of
PROFIBUS DP-V1. This service does not impair the funconality of the standard services under
PROFIBUS DP-V0.
Details
•
PROFIBUS DP-V0 and PROFIBUS DP-V1 can be operated simultaneously in the same net-
work. This enables the step-by-step expansion or modicaon of a system.
•
The services of PROFIBUS DP-V1 can be used by the class 1 master (PLC) and the class 2 DP
master (diagnoscs master, etc.).
•
Integraon of the acyclic service into the xed bus cycle depends on the corresponding
conguraon of the class 1 master:
•
With conguraon, a me slot is reserved.
•
Without conguraon, the acyclic service is appended when a class 2 DP master acycli-
cally accesses a DP-V1 slave.
Product features
•
16 bits each for addressing the parameter index and subindex.
•
Several parameter requests can be combined to one request (mul-parameter requests).
•
Only one request is processed at a me (no pipelining).
•
A request or response must t into one data block (max. 240 bytes). Requests or responses
cannot be split into several data blocks.
•
No spontaneous messages are transferred.
•
There are only acyclic parameter requests.
•
Prole-specic parameters can be read independently of the slave state.
•
A class 1 DP master can always request parameters from a slave if the slave is in the "Data
Exchange" state.
•
In addion to a class 1 DP master, a class 2 DP master can establish communicaon with a
slave:
Transmission direcons for acyclic data transfer
Write.res
Write.req
with data (parameter request)
with data (parameter response)
without data
without data
without data
without data
Read.req
Read.res (-)
Read.req
Read.res (+)Parameter response
Parameter request Parameter request
Parameter
processing
Parameter response
Master
Slave
DP-V1
Procedure:
1.
A "Write.req" is used to pass the data set (DB47) to the slave in the form of a parameter
request.
2.
With "Write.res" the master receives the conrmaon for the receipt of the message.
3.
The master requests the response of the slave with "Read.req".
4.
The slave responds with "Read.res (-)" if processing has not been completed yet.
5.
Aer parameter processing, the parameter request is completed by transming the
parameter response to the master with "Read.res (+)".
Conguring the network
PROFIBUS
Parameter data transfer
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