PCI-6510 | Product Introduction

The NI PCI-6510 is a National Instruments (NI) industrial-grade 32-channel isolated digital input card (30 V, full card isolation, source/drain selectable), PCI bus, half-length card, featuring:

32 channels of isolated DI (±30 VDC, group isolation, source/drain selectable, digital filtering, watchdog)

Suitable for 24 V industrial sensors, PLC signal acquisition, relay contact detection, factory automation, and switch input in strong interference environments.

Part number: 778835-01; discontinued (EOL), replacement model: PCIe-6510.

I. Basic Information

Model: PCI‑6510

Brand: National Instruments (NI)

Series: 651x Industrial Isolated DIO Series

Bus: PCI (5 V compatible, half-length card)

Connector: 1 × 37-pin D‑Sub

Isolation: Entire card 32 channels in a group, optical isolation (ground isolation)

Driver: NI‑DAQmx

Operating Temperature: 0 ~ 55 °C

Features: ±30 V withstand voltage, selectable source/drain type input, digital filtering, programmable power-on state, watchdog timer, high immunity to interference

II. Digital Input DI (32 channels, isolated type)

Channels: 32 isolated digital inputs (single-ended)

Isolation: Entire card 32 channels in a group, optical isolation, ground isolation

Input Voltage Range: ±30 VDC (maximum)

Logic Threshold:

Low Level: ≤ +4 V

High Level: ≥ +11 V

Input Type: Source type (Sink)/ Drain type (Source) software configurable

Input Current: Approximately 3 mA/channel

Filtering: Programmable digital filtering (debouncing)

Power-On State: Programmable (high/low)

Maximum Rate: Approximately 1 MHz (software dependent)

Functions: Status reading, edge detection, change detection, interrupt

III. Industrial Characteristics

Watchdog Timer: Programmable timeout, safe shutdown output (if available)

Change Detection: Channel state change triggers interrupt

Digital Filtering: Suppress contact jitter/noise

High Common-Mode Suppression: Suitable for industrial strong interference environments

IV. Physical and Environmental

Size: Half-length PCI, approximately 12.4 cm × 12.6 cm × 2.2 cm

Weight: Approximately 0.12 kg

Temperature: 0 ~ 55 °C (operating), -20 ~ 70 °C (storage)

Humidity: 10% ~ 90%, no condensation

Withstand Voltage: Isolation withstand voltage ≥ 500 Vrms (to ground)

V. Installation and Usage Tips Installation

Power off and disconnect, insert into the standard PCI half-length slot; after startup, identify with MAX, install NI-DAQmx.

Wiring (37-pin D-Sub)

DI common terminal: Isolated ground, separated from the system ground to avoid ground loop.

24 V sensor: Positive pole connected to DI, negative pole connected to isolated ground (sink type); or vice versa (source type).

Contact signal: One end connected to DI, the other end connected to isolated ground / 24 V.

Do not exceed ±30 V to prevent damage to optocouplers.

Software configuration (NI-DAQmx)

Input type: Sink (Source)

Filtering: Enable 10–50 ms debounce, suitable for relays

Interrupt: Change detection interrupt, reduces polling overhead

Watchdog: Must be enabled in industrial environments to prevent system freeze and loss of control Notes for Attention

Each card is isolated from each other, and the common-mode voltage should not exceed ±30 V.

The long line uses a shielded cable, with the shield connected to the isolation ground and not connected to the system ground.

It is not suitable for direct connection to high voltage (>30 V), and a relay / optocoupler adapter needs to be added.

Six. Core Features

32 isolated DI (±30 V, each card's group of optical isolators, source/drain can be configured, 3 mA per channel)

PCI half-length card, 37-pin D-SUB, NI-DAQmx, watchdog, digital filtering, change detection

Industrial-level isolation, high anti-interference, direct connection to 24 V sensors / relays

Applicable: Factory automation, 24 V switch quantity acquisition, PLC signal connection, relay contact detection, DI in strong interference environments