ABB FENA-01, Руководство пользователя

Страница: 330 / 388

330 PROFINET IO – Communication protocol

DP-V1 read/write request sequence
A read/write service on a drive parameter is illustrated below.
The messaging employs DP-V1 data units. The PROFIdrive
parameter request is included within the DP-V1 request as data.
Likewise, the DP-V1 response contains the PROFIdrive parameter
response as data.
A write request is first sent containing the parameter request. If the
write request is valid, the adapter module acknowledges it with a
DP-V1 write response with no data. The master will then send a
read request. If the adapter module is still busy performing the
internal parameter request, it will return a negative response with
the DP-V1 error code B5h (State conflict). In this case, the master
will repeat the read request until the adapter module has the
PROFIdrive response data ready.
If the write request is invalid, a negative response is returned with
a DP-V1 error code (see section ErrorCode1 on page 329 ).
Master DP-V1 Slave
Parameter
processing
Parameter request
Parameter response
PROFIdrive Write request DB47
Write response
without data
Read request DB47
without data
Read response (–)
without data
Read request DB47
without data
Read response
with data
Parameter
PROFIdrive
Parameter
response
request