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National Instruments Corporation
35
NI UMI-7774/72 User Guide and Specifications
Encoder Interface
Inputs .....................................................................Quadrature, incremental
Differential input threshold....................................±0.3 V (typical),
RS-422 compatible
Termination ............................................................120
Input voltage range ................................................0 to 5.5 VDC
Max quadrature frequency .....................................20 MHz
Limit and Home Switch, Inhibit, Inhibit All, Shutdown, and General Purpose Digital Inputs
Type........................................................................Optically isolated, current sinking
Input voltage range ................................................0 to 30 V
Input ON voltage............................................3.5 to 30 V
Input OFF voltage ..........................................0 to 2 V
Turn on current.......................................................14 mA maximum, current limited
3 mA minimum, current limited
Maximum pulse rate ..............................................100 KHz
Minimum pulse detected........................................10 µs
Reverse polarity protection ....................................Yes, –30 V
Trigger Inputs
Type........................................................................Optically isolated, current sinking
Input voltage range ................................................0 to 30 V
Input ON voltage............................................3.5 to 30 V
Input OFF voltage ..........................................0 to 2 V
Turn on current.......................................................14 mA maximum, current limited
3 mA minimum, current limited
Maximum pulse rate ..............................................1 MHz
Minimum pulse detected........................................1 µs
Reverse polarity protection ....................................Yes, –30 V
Axis Enable Outputs
Type........................................................................Optically isolated, current sourcing
Output voltage range..............................................5 to 30 V
Output current
5 V
iso
..............................................................60 mA, maximum
24 V
iso
............................................................150 mA, maximum
30 V
iso
............................................................160 mA, maximum
Maximum pulse rate ..............................................10 kHz
Minimum pulse generated .....................................100 µs
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