Acyclic Data Via Profibus-Dp: Pke - Eaton DS7 Manual

8 SmartWire-DT
8.9 Programming

8.9.9 Acyclic data via PROFIBUS-DP: PKE

8.9.9.1 Introduction
8.9.9.2 Addressing
8.9.9.3 Protocol
210
Acyclic communications with a slave via PROFIBUS-DP can basically be
established by a Class 1 master and a Class 2 master. This means that the
PKE motor-protective circuit-breaker needs to handle acyclic requests and
responses from and to the masters via the DS7-SWD soft starter.
The PKE motor-protective circuit-breaker provides three objects for acyclic
read access. These objects are addressed with index 1, index 2, index 3; as a
result, they can be separated from index 47, which is used to address the
DS7-SWD soft starter's PROFIdrive objects.
The DS7-SWD soft starter is used to map the protocol in such a way that it is
also possible to access the PKE motor-protective circuit-breaker acyclically
via SmartWire-DT.
In order to perform a read operation, the coordinator sends a read request.
As a response, the requested data or an error message (as the case may be)
is sent directly by the PKE motor-protective circuit-breaker via the DS7-SWD
soft starter.
PROFIBUS-DP
Master
Read
DP Read Request
Request
Read DP Read Response
Response
(Data or Error)
PROFIBUS-DP
Figure 136: Protocol between PROFIBUS-DP master and PKE motor-protective circuit-breaker via
DS7-SWD
￫
Further information on the subject of the "transfer of acyclic
data", consult manual MN05013002Z-EN, "SmartWire-DT
Gateways."
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
PROFIBUS-DP
Gateway DS7
SWD Read Request
DP Error SWD Error
SWD Read Request
(Data or Error)
SWD
PKE
Data
Request
Read
Data
Data
Response
or Error