Ecolab 202580 Manual De Instrucciones página 58

Probifus-DP description
Cyclic data transmission
The data transmission between the DP master and the DP slaves is automatically carried
out by the DP master in a defined, recurring order. During bus system configuration, the
user defines the assignment of a DP slave to the DP master. The user also defines the DP
slaves that are to be included in, or excluded from, the cyclic user data transmission.
Data transmission between the DP master and the DP slaves is divided into three phases:
parameterization, configuration, and data transfer.
Prior to a DP slave entering the data transfer phase, the DP master checks in the
parameterization and configuration phases whether or not the intended configuration
matches the actual device configuration.
In the course of this check, the device type, format and length information as well as the
number of inputs and outputs must match.
These checks provide the user with reliable protection against parameterization errors.
In addition to the user data transfer, which is automatically performed by the DP master,
new parameterization data can be sent to the DP slaves at the request of the user.
Fig. 3: Cyclic data transmission
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