PROFIBUS Manual

Services for data transmission

Services for data transmission

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Services for data transmission

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PROFIBUS offers the following services for data transmission:

 

Service

Function

DP-V0

DP-V1

DP-V2

FMS

SDN

Send Data with No acknowledge

X

X

X

X

SDA

Send Data with Acknowledge

(X)

 

 

X

SRD

Send and Request Data

X

X

X

X

CSRD

Cyclic  Send and Request Data

 

 

 

X

MSRD

Send and Request Data with Multicast Reply

 

 

X

 

CS

Clock Synchronization

 

X

X

 

 

These services are always requested by one bus user as the "initiator" and delivered by another user as the "responder". Only a master with the authority to transmit can request a service listed in this table, but all services can be delivered by either master or slave.

 

Apart from SDN and CS, services are based on a true two-way connection between initiator and responder, requiring a reaction of acknowledgment or response to all services. This important behaviour for the real-time activity of the bus system is called:  immediate response.

 

Asking for a service is called a request (req). Confirmation of a service call is called a confirm (con). A service is displayed as an indication (ind) and optionally acknowledged as a response (res).