Keithley PIO-32I/O 32-Channel Relay I/O Board

The Keithley PIO-32I/O is a 32-channel relay I/O board that delivers optically isolated digital inputs and outputs for industrial automation, process control, and data logging applications. It integrates 16 solid-state MOSFET output channels and 16 solid-state input channels, each with 60V channel-to-channel isolation. The board interfaces directly with IBM PC-compatible systems via standard expansion slot connectivity and includes comprehensive DriverLINX software with test panels, ExceLINX, and DLL/ActiveX drivers for rapid integration into measurement and control systems. ## Technical Specifications ### Digital Outputs • 16 channels, solid-state MOSFET with Form A relay configuration • Voltage range: DC or AC up to 60VDC or 30Vrms • Maximum load current: 350mA per channel • On-resistance: 3.5Ω typical, 4Ω maximum • Switching speed: 1.0ms typical on-time, 80µs typical off-time • Leakage current: 316nA typical at 60VDC (2µA maximum) • Output protection: Zener diodes and overcurrent devices (one per eight channels) ### Digital Inputs • 16 channels, solid-state with optical isolation • Voltage range: DC or AC up to 60VDC or 30Vrms • Input threshold: 3.5VDC to 28VDC • Logic levels: >2.5V high, <1.0V low • Response time: 0.6ms typical, 1.0ms maximum • Input resistance: 4.7kΩ • Selectable low-pass filter for AC/DC sensing • 32 channels support edge-selectable interrupts (rising or falling) ### Electrical & Environmental • Power consumption: 500mA maximum (card); additional 1A available at +5V • Isolation: 60V between channels and chassis via opto-coupler • Operating temperature: 0 to 50°C • Storage temperature: –20 to 70°C • Humidity: 0 to 80% non-condensing at 35°C • Board dimensions: 18.1cm × 10.8cm × 1.9cm ## Key Features • Dual-layer optical isolation ensures superior noise immunity • Ribbon header connectors for straightforward wiring • Requires +5V from expansion slot; incompatible with +3.3V supplies alone ## Compatibility & Integration • Operating systems: Windows 95/98/NT (Windows 7 64-bit not supported) • Designed for IBM PC series and compatible architectures • Bundled DriverLINX software suite enables immediate deployment