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Digital input logic level thresholds
TTL Logic and Contact Closure modes
High level (ON) input voltage ...............≥2 V
Low level (OFF) input voltage...............≤0.8 V
24V modes
IEC 1131-2 compatibility ......................Type 1 and 3
High level (ON) input voltage ...............≥10 V
High level (ON) input current................≥2 mA
High level (OFF) input voltage..............≤6 V
Low level (OFF) input current ...............≤1 mA
Input current
TTL Logic and Contact Closure modes.........≤375 μA at 30 V
Contact Closure mode pull-up current...........≤175 μA through closed contact
24V modes .....................................................≤6.4 mA at 30 V
Minimum detectable pulse width
TTL Logic mode............................................30 μs
24V modes .....................................................30 μs
Contact closure mode.....................................100 μs
Digital Output
Modes (configurable per channel)
DIO power supply voltage range (V
Sourcing current (one channel)..............................0.25 A maximum
Sinking current (per channel) ................................1 A maximum
Output voltage
Sourcing .........................................................>(V
Sinking ...........................................................<50 mV with I
3V TTL Logic mode pull-up .........................>2 V with I
DO protection
Voltage ...........................................................+30 VDC maximum
Reversed voltage ............................................None
Short circuit (sourcing)
Trip current ............................................0.26 A minimum, 1.2 A maximum
Trip time.................................................<250 μs, at 1.2 A
Overcurrent (sinking).....................................6.5 A maximum
DO propagation delay
Sinking ...........................................................150 μs
Sourcing .........................................................2.5 ms
NI WSN-3226 User Guide and Specifications
≤110 μA at 5 V
≤80 μA at 3 V
≤3.2 mA at 15 V
.........................Drive High
High and Low (Sinking and
Logic (Open-Collector with Pull-Up)
) ........3 to 30 V
DIO_PWR
DIO_PWR
28
(Sourcing),
Drive Low
(Sinking),
Sourcing), and
–750 mV) with I
<0.25 A
OUT
<1 A
OUT
<20 μA
OUT
Drive
3V TTL
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