Acces PCI-DIO-72 Digital Input / Output Module

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.