Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Manual do Utilizador descarregar pdf (Página 56)

2706-UM001A-US-P

7-6 Using the Parallel Port

Logic Levels

The DL5’s parallel port accepts DC inputs of 0-24 volts. These input

voltages can be used to trigger messages or transfer variable (numeric) data.

The DL5 interprets the voltages that are present on the data lines as either a

“High” or “Low” condition. There is also a third state which should be

avoided, an in between or indeterminate state. The indeterminate state

occurs when the input voltage is between the “High” voltage range and the

“Low” voltage range. The voltage ranges that the DL5 interprets as either

“High” or “Low” values depends on whether positive or negative binary

logic has been selected.

The table below lists the voltage ranges and their logic values.

Positive Logic

Level

Negative Logic

Level

Recognized

Voltage Range

Indeterminate

Voltage Range

High (True) Low (True) 3.5 to 24V DC 0.9 to 3.5V DC

Low (False0 High (False) 0 to 0.9V DC 0.9 to 3.5V DC

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 118 119

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Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Manual do Utilizador Página 56