Cyclic And Acyclic Communication Via Ctt2 - Siemens SINAMICS G110M Function Manual

Communication via AS-i - only for G110M

7.5 Cyclic and acyclic communication via CTT2

7.5 Cyclic and acyclic communication via CTT2
Via CTT2 (Combined Transaction Type 2), both cyclical and acyclical communication is
performed via AS-i. Because only one channel is available (AS-i.DO1 master -> slave or AS-
i.DI3 slave -> master), a concurrent cyclical and acyclical data exchange is not possible.
The communication type (cyclical or acyclical) is always coded in the first byte in accordance
with the following table.
Table 7- 6
Code
(hex)
Cyclic communication
Access to analog values via DS140 ... DS147. See CP 343−2
/ CP 343−2 P AS−Interface master
(http://support.automation.siemens.com/WW/view/en/558165
7), Chapter 4
Acyclic communication - standard
10 hex
50 hex
90 hex
11 hex
51 hex
91 hex
Acyclic communication - manufacturer-specific
12 hex
52 hex
92 hex
13 hex
53 hex
93 hex
1D hex
5D hex
9D hex
226
CTT2 commands
Explanation/meaning
Read request: Master -> slave
Read request OK: Slave -> master
Read request failed: Slave -> master
Write request: Master -> slave
Write request OK: Slave -> master
Write request failed: Slave -> master
Read request: Master -> slave
Read request OK: Slave -> master
Read request failed: Slave -> master
Write request: Master -> slave
Write request OK: Slave -> master
Write request failed: Slave -> master
Exchange request: Master -> slave
Exchange request OK: Slave -> master
Exchange request faulty: Slave -> master
Followed by
4 bytes: PWE1, PWE2
4 bytes: PWE1, PWE2
2 bytes: Index, length
Index, data
1 byte: Standard error code (3 hex)
Index, length, data
1 byte: Standard error code (3 hex)
Index, length
Data
Fault object
Index, length, data
Fault object
Index, read length, write length, write
data
PKE, index, n-2 data
Fault object
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
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