The Keithley KPCI-PDISO8A is a PCI bus isolated digital I/O board engineered for industrial data acquisition and control applications. It delivers eight optically isolated digital inputs and eight relay outputs—five Form C relays and three Form A relays—with galvanic isolation up to 60V channel-to-channel and channel-to-chassis. The board protects against voltage spikes and ground loops through optical isolation and on-board transient protection, making it suitable for harsh industrial environments with sensors, actuators, and external devices.
## Technical Specifications
**Digital Inputs (8 channels)**
• Solid-state, optically isolated inputs
• Voltage range: DC or AC, up to 60VDC, 30Vrms
• Logic levels: High >|±2.5V|, Low <|±1.0V|
• Response time: 0.6ms typical, 1.0ms maximum
• Selectable low-pass filter: 5ms time constant (200Hz), for AC or slow DC signals
• Not polarity sensitive; supports AC (50–1000Hz) or DC operation
• External interrupt and edge-latching capability for signal synchronization
**Digital Outputs (8 channels)**
• Electromechanical relays: five Form C, three Form A (N.O.)
• Voltage range: DC or AC, up to 60VDC, 30Vrms
• Maximum load current: 350mA per channel
• On-resistance: 3.5Ω typical, 4Ω maximum
• Relay switching times: 1.0ms on-time (max. 3.5ms), 80µs off-time (max. 200µs)
• Leakage current: 316nA typical at 60VDC, 50°C, 30% RH (2µA maximum)
**Electrical & Isolation**
• Power requirement: +5V, 500mA maximum (additional 1A available from pin 1)
• Channel isolation: 60V minimum guaranteed
• Optical isolation reduces noise immunity and ground loop susceptibility
**Environmental**
• Operating temperature: 0 to 50°C
• Storage temperature: -20 to 70°C
• Humidity (non-condensing): 0 to 80% at 35°C
## Key Features
• Optically isolated inputs and relay outputs for ground-loop immunity
• On-board transient protection against voltage spikes
• Selectable low-pass filtering for AC and slow DC measurements
• Programmable interrupt capability with edge-triggered latching
• 33MHz PCI bus interface; standard form-factor PCI card
• Includes 32-bit DriverLINX software for Windows
## Typical Applications
Industrial automation, sensor interfacing, equipment control, data acquisition in electrically noisy environments, relay-switched loads, and isolation-critical measurement systems.
## Compatibility & Integration
33MHz PCI bus slot; 32-bit DriverLINX software driver for Windows-based systems.
