Description
Technical Specifications
| Parameter | Details |
|---|---|
| Product Model | PCI-6514 |
| Manufacturer | National Instruments |
| NI Part Number | 778836-01 |
| Product Type | Industrial digital I/O PCI board |
| Total Channels | 64 |
| Digital Inputs | 32 sink/source inputs |
| Digital Outputs | 32 sourcing outputs |
| Input Voltage Range | -30 to +30 VDC |
| Output Voltage Range | -30 to +30 VDC |
| Logic Level | 24 V |
| Isolation | 30 VDC bank isolation |
| Isolation Configuration | Eight isolated banks |
| Maximum Single-Channel Output Current | 350 mA under specified loading conditions |
| All-Channel Output Current | Derated; approximately 75 mA per line at 100% duty cycle |
| Input Filtering | Software-selectable digital filters |
| Output Protection Features | Programmable power-up states and digital I/O watchdogs |
| Signal Type | Single-ended |
| Host Interface | PCI |
| Front Connector | SCSI-type connector |
| Operating Temperature | 0°C to 55°C |
The output-current distinction is important: 350 mA is not the unrestricted simultaneous current available from all 32 output channels. NI specifies lower per-line current when all outputs operate continuously.
Product Introduction
National Instruments PCI-6514 Digital I/O Board
The National Instruments PCI-6514 is a 64-channel industrial digital I/O interface for PCI-based computer systems. It combines 32 digital inputs with 32 sourcing outputs, using eight isolated banks to separate field signals from the host-side electronics. Its ±30 VDC signal range makes it suitable for interfacing with industrial switches, sensors, relays, and compatible control devices.
PCI-6514
For control-system integration, the board offers programmable output power-up states, watchdog-controlled safe output behavior, and configurable input filtering. These functions help reduce false signal transitions and provide defined output behavior during application or computer faults. Correct wiring, current derating, and software configuration remain essential to reliable operation.
Application Scenarios & Field Pitfalls
The PCI-6514 is useful in industrial test benches, automated inspection systems, and computer-based control platforms that require isolated digital signal acquisition and output switching. Its sourcing outputs can drive compatible loads, but the available current depends on the number of simultaneously active channels and the duty cycle.
Potential application areas
- Industrial equipment status monitoring and discrete signal acquisition.
- Automated test systems requiring multiple isolated digital channels.
- Relay and solid-state relay control using compatible sourcing outputs.
- Machine interlocking and supervisory control through PCI-based computers.
Engineer checks before installation
- Confirm sourcing-output wiring. The 32 outputs are sourcing type. Check load polarity and common-terminal wiring before connecting field devices.
- Observe output-current derating. The 350 mA figure applies under specified channel-loading conditions. NI’s guidance lists approximately 75 mA per line when all lines operate at 100% duty cycle.
- Check bank isolation. The board uses 30 VDC bank isolation, not independent channel-to-channel isolation. Keep field wiring within the specified bank arrangement and voltage limits.
- Configure safe output states. Set power-up behavior and watchdog response before connecting actuators. An incorrect default state can energize an output unexpectedly after startup or a software fault.
- Verify PCI and software compatibility. Confirm the host computer has a compatible PCI slot and that the installed NI driver and application environment support the board. Do not assume a PCIe slot accepts a conventional PCI card without suitable hardware support.
Related Products
The following NI digital I/O boards are related alternatives for industrial signal interfacing. Their channel direction, output topology, current capacity, and isolation arrangement differ.
- PCI-6513 — 64-channel sourcing digital output board. Unlike the PCI-6514, it does not provide the same 32-input/32-output configuration.
- PCI-6515 — 32-input and 32-sinking-output industrial digital I/O board. Its sinking output architecture differs from the PCI-6514’s sourcing outputs.
- PCI-6512 — 64-channel sinking digital output board. Intended for output-only applications rather than mixed input/output configurations.
- PCI-6516 — 32-channel sinking digital output board. It offers a different channel count and output-only arrangement.
- PCI-6517 — 32-channel sourcing digital output board. Consider it for output-only systems, not as a direct replacement for the .
- PCI-6518 — 16-input / 16-sinking-output board. Its channel count and output topology differ from the .
- PCI-6519 — 16-input / 16-sourcing-output board. Relevant to smaller mixed-I/O systems where the channel count is sufficient.
Procurement recommendation: The NI is identified by NI part number 778836-01. Before ordering, confirm the board revision, PCI interface, front connector, terminal block, and cable arrangement. For an existing installation, preserve the original channel assignments and output-state configuration when transferring the board.
