Eaton DS7 - Acyclic Data Via PROFIBUS-DP: DS7

8 SmartWire-DT
8.9 Programming
208 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
8.9.8 Acyclic data via PROFIBUS-DP: DS7
8.9.8.1 Introduction
Acyclic communications with a slave via PROFIBUS-DP can basically be
established by a Class 1 master and a Class 2 master simultaneously.
This means that the DS7-SWD soft starter will need to handle acyclic
requests and responses from/to both masters.
8.9.8.2 Addressing
The parameter channel is embedded as a payload data block in the acyclic
PROFIBUS write/read PDUs.
The acyclic data objects of a slave are addressed via slots and indexes on the
PROFIBUS. SWD maps the slot to the SWD module address. The parameter
channel is always addressed with index 47.
8.9.8.3 protocol
Acyclic services (index-based addressing and payload data) are mapped the
same way on
SmartWire-DT by the PROFIBUS-DP gateway (EU5C-SWD-DP).
As a result, the parameter channel can be used in a fully transparent manner
by SmartWire-DT modules.
The following diagram shows the protocol between the PROFIBUS-DP
master, PROFIBUS-DP gateway, and DS7-SWD soft starter.
Figure 135: Acyclic PROFIBUS-DP parameter channel protocol
￫
For more information on the subject of the transfer of acyclic
data, consult the MN05013002Z-EN manual, “SmartWire-DT
Gateways.”
Parameter
Request
PROFIBUS-DP
Master
PROFIBUS-DP
Gateway
DS7
Parameter
Request
Error or
no Data
Error or
no Data
Parameter
Response
Parameter
Response
(pos./neg.)
Parameter
Processing
DP Write Request
DP Write Response
(no Data or Error)
DP Read Request
DP Read Response
(no Data or Error)
DP Read Request
DP Read Response
((no) Data or Error)
SWD Write Request
SWD Write Response
(no Data or Error)
SWD Read Request
SWD Read Response
(no Data or Error)
SWD Read Request
SWD Read Response
((no) Data or Error)
DP Error SWD Error
OK or
Error
OK or
Error
OK or
Error
DP Error SWD Error
DP Error SWD Error
PROFIBUS-DP SWD
DS7