Model: PCI‑6527

Part Number: 777810‑01

Brand: National Instruments (NI)

Series: 652x Industrial Isolated DIO

Bus: PCI (5 V, half‑length)

Connector: 1 × 100‑pin female

Isolation: 60 V channel‑to‑channel (DI & DO)

Driver: NI‑DAQmx

Operating Temp: 0 ~ 55 °C

Features: 24 opto‑isolated DI (2–28 V), 24 solid‑state relay DO (120 mA), differential sensing, digital filtering, jumperless

I. Digital Inputs (DI) – 24 ch, opto‑isolated, differential

• Channels: 24 optically isolated digital inputs, channel‑to‑channel isolated

• Voltage Range: 2–28 VDC (logic high), 0–1 VDC (logic low)

• Input Type: differential (Dig+/Dig−), no polarity required

• Input Current: 1.5 mA/ch (5 V); 8 mA/ch (24 V)

• Filtering: per‑channel digital debounce / glitch filter

• Interrupts: rising/falling edge detection, change notification

• Isolation: 60 VDC channel‑to‑channel, 500 Vrms field‑to‑system

II. Digital Outputs (DO) – 24 ch, solid‑state relay (Form A)

• Channels: 24 normally‑open solid‑state relay outputs

• Load Voltage: 0–30 VDC max

• Load Current: 120 mA continuous / channel

• On‑Resistance: < 15 Ω (typical)

• Output Type: passive switch (requires external power)

• Isolation: 60 VDC channel‑to‑channel, isolated from system ground

• Life: > 10^8 operations (no mechanical wear)

III. Industrial Features

• Jumperless Design: software‑configurable, no hardware changes

• High CMR: rejects common‑mode noise in motor/inverter environments

• Differential Sensing: improves noise immunity for long cables

• Watchdog: (via NI‑DAQmx) safe state on timeout

• Compact: half‑length PCI, fits standard slots

IV. Physical & Environmental

• Size: 17.5 × 10.7 cm (6.9 × 4.2 in), half‑length PCI

• Weight: ~0.2 kg

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

• Humidity: 10%–90%, non‑condensing

• Power: +5 V @ ~300 mA (typical)

V. Wiring Highlights

• DI (differential): connect sensor between Dig+ and Dig−; 2–28 V = high

• DO (SSR): external 24 V → load → DO → isolated GND; max 120 mA

• Inductive loads: add 1N4007 freewheeling diode across coil

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

VI. Core Advantages & Applications

• 24 ch differential opto‑isolated DI (2–28 V) + 24 ch SSR DO (30 V / 120 mA)

• True channel‑to‑channel 60 V isolation, solid‑state reliability, differential noise immunity, jumperless

• Ideal for 24 V sensor banks, solenoid arrays, LED panels, low‑noise industrial I/O, where channel isolation and long‑term reliability matter