Siemens SINAMICS G110D Operating Instructions Manual page 153

CTT2 Error Codes
In the event that an acyclic request cannot be successfully responded to the following
standard error codes are used.
Table 6- 61 Standard error codes
Error code
0
1
2
3
4
5
6
7
Vendor specific response errors contain an error object. This consists of the appropriate
standard error code followed by up to four bytes of optional further data. Inverters will not
use the optional extra data and so will transmit an error object of only one byte in length.
Cyclic Data Transfer
The CTT2 cyclic data stream allows four bytes in each direction to be transferred on a
regular basis between master and slave. The message between master and slave is 5 bytes
in each direction, first the code byte (00 or 01 depending on direction) and then the four data
bytes. Four bytes is sufficient for any single value parameter to be transferred but where the
parameter to be transferred is of a type shorter than four bytes the data is padded as
described in the figure below.
Figure 6-37
In the inverter the four bytes from the master appear in read only parameter rxxxx and the
four bytes to the master are the value of the parameter pointed to by Pyyyy.
Pxxxx is not connected to any function by default but can be connected to any BiCo
connector input as required – e.g. setting the value of P1070 to xxxx would connect the main
inverter setpoint to the AS-i cyclic data from the master.
SINAMICS G110D
Operating Instructions, 2009-05-15, A5E02385577A AB
Description
no error
Illegal index
Illegal length
request not implemented
busy (request was not executed completely within time frame; try again later)
last acyclic request not acknowledged
Illegal sub index
Command "selective read request" is missing
Cyclic data transfer
6.11 Operation in fieldbus systems
Functions
153