The Acces PCI-DIO-72 is a 72-channel digital input/output module for PCI bus systems, delivering flexible interfacing for industrial automation, data acquisition, and control applications. Built on programmable peripheral interface (PPI) architecture using 8255-5 chips, the module provides individually buffered I/O lines with 32 mA sourcing and 64 mA sinking capability per channel. Port configuration—two 8-bit ports (A, B) and two 4-bit ports (C_high, C_low) per PPI group—is software-selectable as input or output latches. Output buffers feature 10 kΩ pull-up resistors to +5 VDC. The card occupies 16 bytes of I/O address space with system-assigned base addressing and requires no manual jumper configuration.
Technical Specifications
• Interface: PCI Bus
• Digital I/O Channels: 72
• Current Drive: 32 mA source / 64 mA sink per I/O line
• Programmable Peripheral Interface Chips: 8255-5
• Port Configuration: Two 8-bit ports (A, B) and two 4-bit ports (C_high, C_low) per PPI; all ports independently configurable as input or output latches
• Group C Nibble Control: Each 4-bit group independently selectable as input or output
• Output Pull-up Resistors: 10 kΩ to +5 VDC
• I/O Address Space: 16 bytes
• Supply Voltage: +5 VDC available to user
• Logic Level Support: 5 V, 3.3 V, 2.5 V, 1.8 V (jumper selectable on compatible models)
• PCI Compatibility: Universal PCI, PCI-X, 3.3 V and 5 V compatible
• Card Length: 12.2 inches (310 mm)
• Connector: 50-pin male header on mounting bracket; ribbon cable compatible
– Key Features
• Automatic operating system detection (Windows 95/98/NT without manual base address or IRQ configuration)
• Driver and utility support for DOS, Linux, and Windows XP and newer
• Long PCI slot form factor
• Each I/O line fully buffered
– Typical Applications
• Industrial automation control systems
• Data acquisition platforms
• Sensor and device interfacing
• Digital signal routing and switching
– Compatibility & Integration
Automatic plug-and-play detection eliminates manual configuration. The module integrates into standard PCI motherboards and is compatible with industry-standard I/O rack systems.
