Rockwell-automation 2706-DXX Dataliner Message Display DL5 Series Instrukcja Użytkownika Strona 56

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2706-UM001A-US-P
7-6 Using the Parallel Port
Logic Levels
The DL5s 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
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