Keithley KPCI-PDISO8A PCI Bus Isolated I/O Board

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.