4 Commissioning
4.12 Acyclic data
90
DX-NET-PROFINET2-2
01/22 MN040062EN
www.eaton.com
4.12.4.3 PROFINET read request
Read request
After receiving a positive write response, it is possible to start polling read
requests. If a write job has been transmitted previously, information regar-
ding the write status will be requested; in the case of a read job, the data will
be requested.
Read response
The read request will be acknowledged until there is a read response.
The following read responses are possible:
Read response - error
•
If there is an error related to addressing (index)
•
the variable frequency drive/variable speed starter is not available,
•
if the response from the variable frequency drive/variable speed starter
is still pending.
Read response - parameter channel error
•
If the error concerns the PROFIdrive parameter channel
Read response – without data
•
if the variable frequency/variable speed starter drive has determined the
reply during a write order
Read response – with data
•
if the variable frequency drive/variable speed starter has determined the
reply during a read order.
The following sections go into the various possible read responses in greater
detail.
Read response - error
•
If an error has occurred, the read response will contain an error.
Read response - parameter channel error
If there is an error in the parameter channel, a positive read response –
parameter channel error will be generated. The error will be contained either
in a write job or a read job.
Table 48:
Byte designation
Byte
Designation
Description
0
Request Reference
Request identification: Is mirrored
1
Response-ID
Response ID: 81
hex
: Read job(-); 82
hex
: Write job(-)
2
DO-ID
Drive-Object-ID: Is mirrored
3
No. of Parameters
Number of parameters: 01
hex
