Manual – Fieldbus Interface INTERBUS UFI11A
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Application examples
9.3 Representation of the coding examples
All information of a PCP service is represented in a word-by-word manner with one word
listed below the other. This means you can consider a word as an PLC word (for examp-
le Simatic data word). You will find a coding example for the UFI11A in the right table
column.
Select the UFI11A to be configured with the "Communication Reference (CR)." In the
following examples, the UFI11A has been assigned the CR = 02 hex in the CMD tool.
The index defines the parameter that is to be accessed.
Before you can use the PCP channel of the UFI11A, you will have to configure the de-
vice description for the inverter in the CMD Tool.
9.4 Sequence of a parameter setting process
The Peripherals Communication Protocol (PCP) of the INTERBUS standardizes the ac-
cess to parameter data of INTERBUS stations and establishes the following sequence:
• Establishing the PCP connection with the "Initiate" service.
• Reading or writing parameters with the "Read" and "Write" services.
• If the communication connection is no longer necessary, it can be disconnected with
the "Abort" service (not explained here since it often is not necessary, see PCP ma-
nual).
• Initialization of the PCP connection with the "Initiate" service.
Access to the parameters of the Interbus station takes place only after the PCP connec-
tion has been established with "Initiate_Request." This step can be established during
the initial startup of the system.
After sending the service, you should receive a confirmation with "Initiate_Confirmation"
(see PCP manual in case of a non-confirming message).
Word Meaning Coding (hex)
1 Command_Code = Initiate_Request 00 8B
2 Parameter_Count 00 02
3 - Comm._Reference 00 02
4 Password Access_Groups 00 00
Bits 15 ... 8 7 ... 0
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