The Allen-Bradley 1756-IA16 is a 16-point AC digital input module designed for integration within the ControlLogix® series, facilitating efficient monitoring of 120V AC signals in industrial automation systems.
Key Features
- Input Channels: 16 discrete input points, organized into two groups of eight.
- Voltage Range: Operates within 74–132V AC, with a nominal input of 120V AC at 50/60 Hz.
- Response Time: Configurable input delay times, with hardware delays of up to 10 ms (Off to On) and 8 ms (On to Off), plus user-selectable filter times of 1 or 2 ms (Off to On) and 9 or 18 ms (On to Off).
- Current Specifications:
- On-State Current: Minimum of 5 mA at 74V AC; maximum of 13 mA at 132V AC.
- Off-State Current: Maximum of 2.5 mA.
- Power Consumption: Draws 100 mA at 5.1V DC and 2 mA at 24V DC from the backplane, with a total power dissipation of 5.8 W at 60°C.
- Isolation: Provides 125V continuous isolation between groups of eight inputs.
- Environmental Tolerance: Operates within a temperature range of 0–60°C (32–140°F) and supports relative humidity up to 95% non-condensing.
Applications
The 1756-IA16 module is ideal for monitoring AC input signals from field devices in various industrial automation settings, including manufacturing, automotive, packaging, and process control environments. Its integration into the ControlLogix architecture ensures seamless communication and control within complex PLC systems.
Installation and Compatibility
This module occupies a single slot in a ControlLogix chassis and requires a 20-pin removable terminal block (RTB) for field-side wiring connections. It is compatible with all ControlLogix chassis configurations, offering flexibility for both new installations and system upgrades.
Certifications
The 1756-IA16 module meets various international standards, including CE, CSA, and UL certifications, ensuring compliance with global safety and performance requirements.
In summary, the Allen-Bradley 1756-IA16 AC input module delivers reliable performance and versatility for monitoring 120V AC signals, making it a valuable component in industrial automation systems.

















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