Cyclic Communication - Siemens SINAMICS G110M Function Manual

Communication via AS-i - only for G110M
7.5 Cyclic and acyclic communication via CTT2
If an acyclical request cannot be executed by the inverter, it replies with one of the following
error messages.
Error message
7.5.1

Cyclic communication

Inverter -> master
The inverter 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 default setting 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 -> inverter
The master transfers the data in the "Combined Transaction Type 2" (CTT2) to the inverter
and writes it to r2050[1] and r2050[2].
To process these values in the inverter, you must appropriately interconnect r2050[1] and
r2050[2] in the inverter. 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 default setting 34
If, when commissioning, you select "Default setting 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.
212
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
Function Manual, 01/2016, FW V4.7 SP6, A5E34229197B AC
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