Acyclic Data Via Profibus-Dp: Ds7 - Eaton DS7 Manual

8 SmartWire-DT
8.9 Programming

8.9.8 Acyclic data via PROFIBUS-DP: DS7

8.9.8.1 Introduction
8.9.8.2 Addressing
8.9.8.3 protocol
208
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.
￫
For more information on the subject of the transfer of acyclic
data, consult the MN05013002Z-EN manual, "SmartWire-DT
Gateways."
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.
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.
PROFIBUS-DP
Master
Parameter
DP Write Request
Request
Error or
DP Write Response
no Data
(no Data or Error)
DP Read Request
Error or
DP Read Response
no Data
(no Data or Error)
DP Read Request
Parameter
DP Read Response
Response
((no) Data or Error)
PROFIBUS-DP
Figure 135: Acyclic PROFIBUS-DP parameter channel protocol
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
PROFIBUS-DP
Gateway DS7
SWD Write Request
DP Error SWD Error
SWD Write Response
(no Data or Error)
SWD Read Request
DP Error SWD Error
SWD Read Response
(no Data or Error)
SWD Read Request
DP Error SWD Error
SWD Read Response
((no) Data or Error)
SWD
DS7
Parameter
Request
OK or
Error
Parameter
OK or
Error Processing
OK or
Error
Parameter
Response
(pos./neg.)