PCI-6512 | Product Introduction

The NI PCI-6512 is a National Instruments (NI) industrial-grade 64-channel isolated digital output card (±30 V, 8 groups of isolation, source output, high current drive), PCI bus, half-length card, featuring:

64 channels of isolated DO (±30 VDC, 8 groups of independent optocouplers, source-type output, 75 mA per channel, peak 350 mA, watchdog, programmable power-on state) NI

Suitable for 24 V relays, solenoids, contactors, LED loads, industrial actuators, factory automation, and switch quantity control in strong interference environments.

Part number: 778968-01; discontinued (EOL), replacement model: PCIe-6512NI.

I. Basic Information

Model: PCI‑6512

Brand: National Instruments (NI)

Series: 651x Industrial Isolated DIO Series

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

Connector: 1 × 100-pin SCSI (high density)

Isolation: 64 channels divided into 8 groups (Bank 0–7, 8 channels per group), optical isolation between groups

Driver: NI-DAQmx (7.2 and above)

Operating Temperature: 0 - 55 °C

Features: ±30 V withstand voltage, 8 groups of isolation, source-type output, large current drive, watchdog, programmable power-on state, high interference resistance NI

II. Digital Output DO (64 channels, isolated type, source output)

Channels: 64 isolated digital outputs (single-ended), divided into 8 groups (8 channels per group)

Isolation: Optical isolation between groups, independent isolation for each group, ground isolation

Output Voltage Range: 0 - +30 VDC (source output, high active) NI

Load Current:

Continuous: 75 mA/channel NI

Peak (pulse): 350 mA/channel

Output Type: Source (Source), output high-level drives load

On-Resistance: Low resistance, typical < 1 Ω

Power-On State: Programmable (high / low / hold) NI

Maximum Switching Rate: Approximately 100 kHz (software dependent)

Functions: Single-point control, group control, pulse output, PWM (software), fail-safe shutdown

III. Industrial Characteristics

Watchdog Timer: Programmable timeout (1–65535 ms), automatically switches to safe output (high / low) when fault occurs (NI)

Programmable Power-On State: Prevents accidental actions during power-on NI

Group Independent Isolation: 8 groups completely independent, can be connected to different voltage domains, suppresses ground loop interference NI

High Common-Mode Suppression: Suitable for strong interference fields such as motors, frequency converters, relays, etc.

Overcurrent / Overvoltage Protection: Single-channel current limiting, prevents short circuit damage

IV. Physical and Environmental

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

Weight: Approximately 0.15 kg

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

Humidity: 10% - 90%, no condensation

Isolation Voltage: ≥ 500 Vrms (between groups / to ground)

Power Consumption: +5 V @ 150 mA; +3.3 V @ 300 mA (typical)

V. Installation and Usage Tips

Installation

Turn off and disconnect power, insert into standard PCI half-length slot; turn on and identify in MAX, install NI-DAQmx.

Cabling (100-pin SCSI)

8 independent isolated grounds: Each group's ground is isolated from the system ground to avoid ground loop.

Source Output Cabling: DO connected to the positive terminal of the load, negative terminal of the load connected to the isolated ground of the same group (24 V load).

Load Voltage: 0 - 30 VDC, recommended 24 V industrial standard.

Do not short circuit: Single-channel current limiting, long-term short circuit will trigger protection.

Inductive Load (Relay / Electromagnetic Valve): Be sure to parallel a shunt diode (1N4007) to prevent reverse high voltage breakdown of the board.

Software Configuration (NI-DAQmx)

Output Mode: Source (Source)

Power-On State: Set to low level (default safe)

Watchdog: Must be enabled in industrial field, set timeout to 100–500 ms, safe state low level

Output Rate: Relay control recommended ≤ 10 Hz, avoid contact burnout

Notes for Attention

8 independent isolation groups, with insulation voltage ≥ 500 Vrms between groups, and capable of connecting different voltage loads.

Long lines use shielded cables, with the shielding connected to the isolation ground of the same group and not connected to the system ground.

It is not suitable for directly connecting loads > 30 V; a middle relay needs to be added for conversion.

Capacitive loads must be equipped with a rectifier diode; otherwise, the output channel is prone to damage.

Six. Core features

64 isolated DO (±30 V, 8 independent optocouplers, source-type output, 75 mA per channel, peak 350 mA) NINI

PCI half-length card, 100-pin SCSI, NI-DAQmx, watchdog, programmable power-on state, group independent isolation, large current drive NI

Directly drives 24 V relays / solenoids / LEDs, highly anti-interference, suitable for large-scale switch quantity control

Applicable: Factory automation, 64-channel actuator control, relay / solenoid drive, LED array, strong interference environment DO