120 Communication protocol
Service access points (SAPs)
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 SAPs, refer to the manual of the
PROFIBUS master, PROFIDRIVE – The PROFIBUS Profile for
Adjustable Speed Drives V2.0 and V3.1, or the EN 50170 and
IEC 61784 standards.
Communication start-up
The following service access points (SAPs) are used to initiate DP
communication:
SAP no. Short name Name
Default SAP (0) Data_Exch Cyclical Data Exchange
(Write_Read_Data)
58 Global_Control Global Control Service
59 Get_Cfg Read Configuration Data
60 Slave_Diag Read Diagnostic Data
61 Set_Prm Send Parameter Data
62 Chk_Cfg Check Configuration Data
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