Eaton Power XL SmartWire-DT DX-NET-SWD Series, Руководство пользователя

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4 Commissioning
4.5 Acyclic data
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DX-NET-SWD... 08/14 MN04012009Z-EN www.eaton.com
4.5.4 Acyclic parameter channel for DX-NET-SWD...
4.5.4.1 Introduction
The acyclic parameter channel is used in order to configure the parameters
of the variable frequency drive/variable speed starter; it corresponds to
PROFIdrive profile.
The following sections describe the parameter channel's functions.
4.5.4.2 Protocol
The most important task of the DX-NET-SWD… SmartWire-DT connection is
to map 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. A parameter request is used
to define whether the job is a read or a write job. After the write request is
transmitted (contains read or write job), a write response without data will be
expected. Then the coordinator poles through the read request of the
variable frequency drive, prompted by the application of the higher level PLC.
This keeps acknowledging the read request as negative (Error: State Conflict)
until the read response has been completed and a reply (read order: with
data / write request: without data) can be sent.
Figure 27: 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
PowerXL
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
PowerXL