Technical data

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4.4. The data channels
The DK900 offers the following data channels which are logically separated from each other:
· Process data channel for inputs (identifier 0x98)
· Bidirectional channel (identifier 0xFF)
· Shortened bidirectional channel (identifier 0xBF)
· Slave diagnosis
The following combinations are possible:
· Process data channel alone: 98
· Bidirectional channel alone: FF
· Short bidirectional channel alone: BF
· Process data channel + bidirectional channel: 98 + FF or FF + 98
· Process data channel + short bidirectional channel: 98 + BF or BF + 98
4.4.1. Process data channel for inputs (identifier 0x98)
The process data channel contains, at any time, the data that appear in the display of the
DK900. It is impossible to transmit commands or data to
the DK900.
The data are continuously transmitted to the Master at the maximum speed defined during the
Profibus’ parameterisation. The data contents are updated at the mean value rate defined
for the analog output of the DK900 during parameterisation. The same applies for systems
that are not equipped with an analog output, as far as hardware is concerned. This allows
very fast data transmission (up to appr. 10 milliseconds) with a steady display at the same
time.
The data are put out with the increment parameterised within the DK900. Transmission is
performed in the form of a standard input identifier with a 9 Byte consistency.
DK900 12