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NI ISM-7400 User Manual
Digital Inputs
Optically isolated, 5 to 24 V logic. Sourcing, sinking, or differential signals can be used. Drive
steps on falling edge of STEP+ input.
Minimum on voltage.........................................4 VDC
Maximum voltage .............................................30 VDC
Input current......................................................5 mA typ at 4 V,
15 mA typ at 30 V
Maximum pulse frequency ...............................150 kHz or 2 MHz (switch selectable)
Minimum pulse width.......................................3
μ
s (at 150 kHz setting)
0.25
μ
s (at 2 MHz setting)
Fault Output
Photodarlington.................................................80 mA, 30 VDC max
Voltage drop ......................................................1.2 V max at 80 mA
Physical
Dimensions .......................................................1.71 × 2.20 × 2.64 in.,
5 mm shaft with flat, (43.5 × 56 × 67 mm)
overall, not including pilot or shaft
Weight ...............................................................14.7 oz (416 g)
Rotor inertia ......................................................1.16 × 10 to 3 oz · sec
2
(82 g · cm
2
)
Operating
temperature range ............................0 °C to 40 °C
Incremental Encoder Specifications
10-pin connector signals (pin assignments)
Ground .....................................................1, 2
Index- .......................................................3
Index+ ......................................................4
A- .............................................................5
A+ .............................................................6
+5VDC power ..........................................7, 8
B- .............................................................9
B+ .............................................................10
Power supply requirements...............................5 VDC at 56 mA typical, 59 mA max
Encoder internal differential line driver (26C31)
Source .......................................................20 mA at TTL levels
Sink ...........................................................20 mA at TTL levels
Maximum encoder frequency ..........................100,000 cycles per second