Eaton DS7 - Acyclic Data Via PROFIBUS-DP: PKE

8 SmartWire-DT
8.9 Programming
210 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
8.9.9 Acyclic data via PROFIBUS-DP: PKE
8.9.9.1 Introduction
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.
8.9.9.2 Addressing
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.
8.9.9.3 Protocol
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.
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.”
Read
Request
Read
Response
PROFIBUS-DP
Master
PROFIBUS-DP
Gateway
PKE
Data
Request
Data
Response
or Error
Read
Data
DP Read Request
DP Read Response
(Data or Error)
SWD Read Request
SWD Read Request
(Data or Error)
DP Error
PROFIBUS-DP SWD
DS7
SWD Error