Beckhoff PT100 Manual de usuario descargar pdf (Pagina 6)

PT100 4-fold temperature measurement Beckhoff II/O System

Page 6 of 10 Version : 1.1 Date : 12 March 97

Channels are pre-selected in accordance with Select 1-4 priorities.

Select1 Select2 Select4 Significance D0, D1

0 0 0 Measurement channel 1 is

selected.

1 0 0 Measurement channel 2 is

selected.

0 1 0 Measurement channel 3 is

selected.

1 1 0 Measurement channel 4 is

selected.

0 0 1 Control channel a is selected.

1 0 1 Control channel b is selected.

Pre-selection is valid with the falling edge (1=>0) of signal "Valid" D2.3.

Control channels a and b provide a specific bit pattern at selection. This allows for monitoring

of whether or not the microprocessor is active and properly operating.

Set value for control channel a: AA55 hex

Set value for control channel b: 55AA hex

The processor may be restarted by means of the D2.7 reset key if this alternating bit pattern is

not provided.

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Beckhoff PT100 Manual de usuario Pagina 6