Model: PCI‑6519

Part Number: 779085‑01

Brand: National Instruments (NI)

Series: 651x Industrial Isolated DIO

Bus: PCI (5 V, half‑length)

Connector: 1 × 37‑pin D‑Sub

Isolation: 2 optically isolated banks (Bank 0: 16 DI; Bank 1: 16 DO)

Driver: NI‑DAQmx

Operating Temp: 0 ~ 55 °C

Features: ±30 V, 16 sink/source inputs + 16 sink outputs, bank isolation, watchdog, programmable power‑on, low cost

I. Digital Inputs (DI) – 16 ch, isolated, sink/source

• Channels: 16 isolated digital inputs (Bank 0)

• Voltage Range: ±30 VDC

• Logic Thresholds: Low ≤ +4 V, High ≥ +11 V

• Input Type: sink or source configurable

• Filtering: programmable debounce filters per channel

• Max Rate: ~100 kHz (software dependent)

• Functions: change detection, event counting, status monitoring

II. Digital Outputs (DO) – 16 ch, isolated, sink

• Channels: 16 isolated digital outputs (Bank 1, sink)

• Voltage Range: 0 ~ +30 VDC (sink, low active)

• Load Current:

  • Continuous: 120 mA/channel

  • Peak: 500 mA/channel

• Output Type: sink (pulls load to ground)

• On‑Resistance: < 1 Ω (typical)

• Power‑On State: programmable (high/low/hold)

• Max Switching Rate: ~100 kHz

• Functions: single/group control, pulse, software PWM, watchdog safety

III. Industrial Features

• Watchdog Timer: 1–65535 ms; fault → safe state (high/low)

• Programmable Power‑On: prevents unexpected actuation

• Dual‑Bank Isolation: DI bank / DO bank isolated from each other & system ground

• Overcurrent Protection: per‑channel current limiting

• High CMR: robust for motors, inverters, relays

IV. Physical & Environmental

• Size: half‑length PCI, ~12.4 × 12.6 × 2.2 cm

• Weight: ~0.15 kg

• Temperature: 0 ~ 55 °C (oper), −20 ~ 70 °C (storage)

• Humidity: 10%–90%, non‑condensing

• Isolation Voltage: ≥ 500 Vrms (banks to system ground)

• Power: +5 V @ ~150 mA; +3.3 V @ ~300 mA

V. Wiring Highlights

• DI (sink/source): sensor to +24 V or GND; threshold +4 V low / +11 V high

• DO (sink): load between +24 V and DO; DO low = ON

• Inductive loads: add 1N4007 freewheeling diode across coil

• Shielding: shield to isolated field ground, not system ground

VI. Core Advantages & Applications

• 16 isolated DI (sink/source) + 16 isolated sink DO, ±30 V, 120 mA continuous sink outputs

• Dual‑bank optical isolation, watchdog, programmable power‑on, NI‑DAQmx, half‑length PCI

• Ideal for 24 V industrial sensors + sink‑type relay/valve control, mixed I/O, manufacturing test, industrial automation