Acyclic Parameter Channel For Ds7-Swd Soft Starter - Eaton DS7 Manual

8 SmartWire-DT
8.9 Programming

8.9.6 Acyclic parameter channel for DS7-SWD soft starter

8.9.6.1 Introduction
8.9.6.2 Protocol
198
The acyclic parameter channel is used in order to configure the parameters
of the DS7-SWD soft starter; it corresponds to PROFIdrive profile.
The following sections describe the parameter channel's functions.
The DS7-SWD soft starter is responsible, among other things, for mapping
the protocol in such a way that SmartWire-DT will be able to use the
parameter channel in a fully transparent manner. Regardless of whether data
should be read or written, the first request from the coordinator will always
be a write request. The parameter request will define whether the job is a
read job or a write job. After the write request is transmitted (contains read
or write job), a write response without data will be expected. After this, the
coordinator, prompted by the higher-level PLC's application, will poll the DS7
with read requests. The DS7 will acknowledge the read requests negatively
(error: state conflict) until the read response is completed and the DS7 can
send a response (read job: with data / write request: without data).
Client
Parameter
SWD Write Request
Request
Error or
SWD Write Response
no Data
(no Data or Error)
SWD Read Request
Error or
SWD Read Response
no Data
(no Data or Error)
SWD Read Request
Parameter
SWD Read Response
Response
((no) Data or Error)
SWD
Figure 134: Acyclic parameter channel protocol
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
DS7
Parameter
Request
OK or
SWD Error
Error
Parameter
OK or
SWD Error
Error Processing
OK or
SWD Error
Error
Parameter
Response
(pos./neg.)
DS7