Advanced commissioning
6.7 Drive control via AS-i
SINAMICS G115D distributed drive
170
Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
If an acyclical request cannot be executed by the converter, it replies with one of the
following error messages.
Error message Meaning
0
No fault
1
Invalid index
2
Incorrect length
3
Request not implemented
4
Busy
(the request could not be processed completely within the time window, retry later)
5
Last acyclical request was not confirmed
6
Invalid subindex
7
"Selective read request" command missing
6.7.4.1
Cyclic communication
Converter → master
The converter cyclically transfers the data from p2051[1] and p2051[2] in four bytes to the
master. You can process these four bytes in the control as for analog data. Refer to the
documentation for the AS-i master for detailed information about access to analog data.
If you selected Macro 31 or 34 during the commissioning, the two indexes are
interconnected as follows:
•
p2051[1] = 63: Smoothed actual speed value
•
p2051[2] = 27: Absolute smoothed actual current value
The values for transfer are normalized in accordance with the PROFIdrive N2 data type. Using
p2051[1] and p2051[2] you can interconnect any other or connector parameters and transfer
to the control.
Master → Converter
The master transfers the data in the "Combined Transaction Type 2" (CTT2) to the converter
and writes it to r2050[1] and r2050[2].
To process these values in the converter, you must appropriately interconnect r2050[1] and
r2050[2] in the converter. This means, when the control sends the speed setpoint, you must
interconnect parameter p1070 (source for the main setpoint) with r2050 as follows:
p1070[0] = 2050[1]
Note
Internal interconnection with Macro 34
If, when commissioning, you select Macro 34, then the main setpoint is internally
interconnected with r2050[1].
Once a setpoint has been transferred completely, the setpoint present in the control will be
transferred as next setpoint. Any setpoint changes made during the transfer are not
considered.
