PROFIBUS Manual

SAP configuration

SAP configuration

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SAP configuration

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With the DP protocol, services are coded using SAPs  (service access points). A telegram addressed to an SAP automatically has a certain meaning. The SAP therefore defines the function of the telegram.

 

For an MS0 connection the following SAPs are used:

 

SAP: service access points of master

SAP

Name

Meaning

---

Data_Exchange

Cyclic data exchange

62 (0x3E)

MSCY1M

Slave handler per DP slave

 

SAP: service access points of DP slave

SAP

Name

Data from master to slave

Data from slave to master

---

Data_Exchange

Output data

Input data

53 (0x35)

Ext_User_Prm

Ext. parameter

SC

55 (0x37)

Set_Slave_Adr

Address

SC

56 (0x38)

Rd_Inp

Blank

Input data

57 (0x39)

Rd_Outp

Blank

Output data

58 (0x3A)

Global_Control

Control

---

59 (0x3B)

Get_Cfg

Blank

Configuration

60 (0x3C)

Slave_Diagnosis

Blank

Diagnosis

61 (0x3D)

Set_Prm

Parameter

SC

62 (0x3E)

Chk_Cfg

Configuration

SC

 

The data contents of individual telegrams are explained in the following chapters.