The HP/Agilent 44425A is a 16-channel isolated digital input module for data acquisition and industrial control systems. It acquires digital data from up to 16 independent lines while providing galvanic isolation to reject noise and transient overvoltages. The module operates with 5 V, 12 V, or 24 V input signals and includes an onboard 5 V supply for driving external contact closures and open-collector outputs. Dual operational modes—standard digital input and interrupt-driven monitoring—accommodate both continuous data bus surveillance and event detection. Up to 8 channels can be configured for interrupt operation, enabling the module to signal the host controller when specified logic transitions occur, making it ideal for detecting transient signals and momentary switch events without continuous polling.
Technical Specifications
• Channels: 16 digital inputs
• Input voltage levels: 5 V, 12 V, or 24 V
• External supply output: 5 V (for external circuit driving)
• Dimensions: 12 × 8 × 3 inches (approximate)
• Weight: 4 lbs (approximate)
– Key Features
• Dual-mode operation: digital input sensing and interrupt-driven data acquisition
• Up to 8 channels configurable for interrupt monitoring
• Galvanic isolation protects against noise and voltage spikes
• Multi-voltage input compatibility (5 V, 12 V, 24 V logic levels)
• Onboard 5 V supply for external load driving
• Suitable for monitoring digital data buses and detecting transient signals
– Typical Applications
• Industrial automation and process control systems
• Plant floor data acquisition with noise immunity requirements
• Real-time event detection and momentary signal monitoring
• Digital bus surveillance in harsh electrical environments
– Compatibility & Integration
The 44425A integrates with the Agilent 3497A Data Acquisition System. When paired with the Actuator/Digital Output Assembly (Option 110), it forms an independent digital input/output port for bidirectional control applications.
