NPBA-12 Installation and Start-up Guide 6-1
Chapter 6 – Communication
Overview
This chapter describes the PROFIBUS messaging used in the
communication with the drive.
PROFIBUS-DP
The NPBA-12 module supports the PROFIBUS-DP protocol, including
the DPV1 Extensions to the EN 50170 standard. PROFIBUS-DP is a
distributed I/O system which enables the master to use a large number
of peripheral modules and field devices. The data transfer is mainly
cyclic: the master reads the input information from the slaves and
sends the output information back to the slaves.
The PROFIBUS-DP protocol uses so-called PPOs (Parameter/Process
Data Objects) in cyclic communication. See Figure 6-1 for the different
PPO types and their composition.
Service Access Points The services of the PROFIBUS Data Link Layer (Layer 2) are used by
PROFIBUS-DP through Service Access Points (SAPs). Precisely
defined functions are assigned to individual SAPs.
For further information on Service Access Points, refer to the manual of
the PROFIBUS master, PROFIDRIVE – The PROFIBUS Profile for
Adjustable Speed Drives, or the EN 50170 standard.
Communication
Start-up
The following Service Access Points (SAPs) are used to initiate DP
communication:
SAP No. Short Name Name
61 Set_Prm Send Parameter Data
62 Chk_Cfg Check Configuration Data
60 Slave_Diag Read Slave Diagnostic Information
128 (Default) Data_Exch Transfer Input and Output Data
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