PROFIBUS DP-V0 <—> PROFIBUS DP-V1

Commands and monitoring signals

The transfer of commands and monitoring signals is the essential task of the field bus and the connected units.

They control and inform mainly about the process, e.g. control digital/analog outputs or read digital/analog inputs. They are the same for DP-V0 and DP-V1

Command and monitoring telegrams represent the cyclic data transfer.

Diagnosis

The diagnosis telegram provides detailed information if there is any problem, particularly in the process. A short circuit on a digital output is an example. Diagnosis data are automatically read by the PROFIBUS DP master if it gets a general fault info within a monitoring telegram.

Parameters

Parameters are necessary to adapt the device to the process.

E.g., for the Digital S500 I/O modules the parameter “Input Delay” can be configured to filter contact switch bouncing

Parameters can also include service-oriented data such as “Operation hours”.

The main difference between the PROFIBUS DP versions DP-V0 and DP-V1 is:

DP-V0 only allows to write the complete parameter set in one block.

The bus master sends the parameter block to the slave during power-up of the slave/device. Some control systems also allow to send the parameter block during normal operation.

DP-V1 offers reading and writing single parameters.

The possibility to read single parameters is an important advantage: E.g. to read single parameters of a drive (configuration parameters). In AC500 the function block DPV1_MSCAC1_READ can be used.

Note

In all cases only the bus master can start the data exchange on the PROFIBUS DP bus.

PROFIBUS DP Master Class 1, PROFIBUS DP Master class 2

PROFIBUS DP Master, class 1 and class 2