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Manual – Fieldbus Interface INTERBUS UFI11A
Application examples
9.5 Reading of an UFI parameter
You read an UFI11A parameter with the "Read" service. The parameters are typically 4
bytes long (1 double word). This read service accesses only those parameters with in-
dices between 8300dez and 8310dez. Parameter access to all other parameters of the
UFI11A or a drive inverter connected to the UFI11A takes place via object 8288 "Vari-
able data channel with acyclical routing." The access is decribed in the next section.
Example
Reading of index 8301 unit type (Index 8301dez = 206Dhex)
After sending the service, you should receive a confirmation with "Read_Confirmation."
The parameter data are displayed as follows in the Motorola format (Simatic format):
00 28 01 00 hex = Identification for UFI11A
You will find additional information on the UFI11A parameters in the section "Parameter
List."
Word Meaning Coding (hex)
1 Command_Code = Read_Request 00 81
2 Parameter_Count 00 03
3 Invoke_ID Comm._Reference 00 02
4 Index 20 6D
5 Subindex - 00 00
Bits 15 ... 8 7 ... 0
Word Meaning Coding (hex)
1 Message_Code = Read_Confirmation (+) 80 81
2 Parameter_Count 00 05
3 Invoke_ID Comm._Reference 00 02
4 Result (+) 00 00
5 - Length 00 04
6 Data [1] Data [2] 00 28
7 Data [3] Data [4] 01 00
Bits 15 ... 8 7 ... 0
Data [1] = High Byte Data [2] = Low Byte Data [3] = High Byte Data [4] = Low Byte
00 hex 28 hex 01 hex 00 hex
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