General Information on Implementation via PROFIBUS DP

Overview

The PROFIBUS DP LTMR controller supports a PROFIBUS DP application profile based on DP V0 and DP V1 services: Motor Management Starter (MMS).

Cyclic/Acyclic Services

In general, data is exchanged via cyclic services and via acyclic services.

The application profiles define, for the cyclic data:

• Manufacturer independent data,

• Manufacturer-specific data.

The fixed set and defined use of manufacturer independent data enables the replacement of a module from vendor A by a module from vendor B.

DP V1 Read/ Write Services

DP V1 read and write services enable access to the data that cannot be accessed by cyclic data exchange.

PKW Feature

In order to make this data accessible also for DP V0 primaries, a special feature, called PKW (Periodically Kept in acyclic Words), is implemented.

In cyclically exchanged data, there are encapsulated request and response frames. They provide access to the TeSys T system´s internal registers.

Clear Mode Option

The LTMR controller supports the Clear Mode option. When the PROFIBUS DP primary is in Clear Mode, the LTMR controller generates a communication trip, if enabled, and applies its fallback condition.

As soon as PROFIBUS DP data packets are received, the LTMR controller removes its fallback condition.