Functions
6.11 Operation in fieldbus systems
SINAMICS G110D
180 Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
The CTT2 protocol allows both cyclic and acyclic serial data to be transferred between
master and slave. The commands implemented to achieve this are as shown in the table
below.
Table 6- 66 CCT2 commands
Read cyclic data from slave
1 0x01 Write cyclic data to slave 4 byte PWE data
80 0x50 Standard read response ok Data
Standard read response error
Standard write response ok
Standard write response error
Vendor specific read request
Vendor specific read response ok
Vendor specific read response error
Vendor specific write request
Vendor specific write response ok
Vendor specific write response error
29 0x1D Vendor specific exchange request index, read length, write
Vendor specific exchange response ok
Vendor specific exchange response error
In the event that an acyclic request cannot be successfully responded to the following
standard error codes are used.
Table 6- 67 Standard error codes
3 request not implemented
busy (request was not executed completely within time frame; try again later)
last acyclic request not acknowledged
Command "selective read request" is missing
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.
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