Cyclic Communication - Siemens SINAMICS G110M Function Manual

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].
Fieldbuses
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
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
Communication via AS-i - only for G110M
7.5 Cyclic and acyclic communication via CTT2
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