Eaton DS7 - Acyclic Parameter Channel for DS7-SWD Soft Starter

8 SmartWire-DT
8.9 Programming
198 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
8.9.6 Acyclic parameter channel for DS7-SWD soft starter
8.9.6.1 Introduction
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.
8.9.6.2 Protocol
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).
Figure 134: Acyclic parameter channel protocol
Client
SWD Error
OK or
Error
OK or
Error
OK or
Error
SWD Error
SWD Error
Parameter
Request
Parameter
Request
Error or
no Data
Error or
no Data
Parameter
Response
Parameter
Response
(pos./neg.)
Parameter
Processing
DS7
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)
SWD
DS7