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
