Product Overview
The Allen-Bradley 1756-IA16I is a ControlLogix digital AC input module designed for demanding industrial automation environments. It provides 16 individually isolated input channels, allowing you to monitor discrete AC signals with confidence. As part of the ControlLogix family, the 1756-IA16I integrates seamlessly into both local and remote chassis configurations, making it a versatile choice for process and machine control.
Key Features & Benefits
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16 Individually Isolated Inputs: Each channel is isolated to prevent ground loops and reduce noise interference, improving signal integrity in harsh plant environments.
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Wide Operating Range: Accepts 79–132V AC at 47–63 Hz, compatible with standard industrial power supplies.
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Programmable Input Delay: Choose 9 or 18 ms filter times to match your application's response requirements.
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Electronic Module Keying: Prevents incorrect module insertion, reducing installation errors.
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Removable Terminal Blocks: Supports 1756-TBCH and 1756-TBS6H housings for easy wiring and module replacement without rewiring.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1756-IA16I |
| Series |
ControlLogix |
| Module Type |
Digital AC Input Module |
| Number of Inputs |
16 Individually Isolated |
| Input Voltage |
120V AC |
| Operating Voltage Range |
79–132V AC |
| Input Delay Time |
Programmable 9 or 18 ms |
| Minimum Operating Current |
5 mA at 79V AC, 47–63 Hz |
| Maximum Operating Current |
15 mA at 132V AC, 47–63 Hz |
| Maximum Off-State Current |
2.5 mA |
| Power Dissipation (Max) |
4.9 W at 60°C |
| Backplane Current at 5V |
125 mA |
| Backplane Current at 24V |
2 mA |
| Removable Terminal Blocks |
1756-TBCH, 1756-TBS6H |
| UPC |
10612598164476 |
Applications
The 1756-IA16I excels in applications where reliable AC signal detection is critical. Typical uses include:
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Motor Control Monitoring: Detect the presence of AC control voltages in motor starter circuits, enabling precise status tracking.
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Valve Position Sensing: Monitor discrete AC signals from limit switches or proximity sensors in automated valve systems.
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Conveyor System Feedback: Interface with photo-eyes or push buttons in material handling lines to ensure smooth operation.
Thanks to its isolated channels, the 1756-IA16I is ideal for environments with mixed AC commons, reducing wiring complexity and improving safety.
Installation & Setup
Installing the 1756-IA16I is straightforward. Follow these steps:
- Mount the module into any ControlLogix chassis slot (local or remote).
- Attach a compatible removable terminal block housing (1756-TBCH or 1756-TBS6H) to the module front.
- Wire the AC input signals to the terminal block terminals, respecting the isolation boundaries.
- Configure the module in your ControlLogix programming software, setting input delay times (9 or 18 ms) as needed.
- Power up the system and verify channel status via front panel LEDs.
Ensure that the operating voltage stays within the 79–132V AC range to avoid damage.
Maintenance & Reliability
The 1756-IA16I requires minimal maintenance, but regular checks can extend its service life:
- Periodically inspect terminal block connections for tightness to prevent loose wiring.
- Keep the module free of dust and debris, especially in high-vibration areas.
- Monitor ambient temperature; the module is rated for up to 60°C, so ensure proper ventilation.
- Check for any signs of overheating or discoloration on the module face.
With proper care, the 1756-IA16I delivers long-term reliability, minimizing downtime and replacement costs.
Compatibility & Integration
The 1756-IA16I is compatible with any ControlLogix processor and communication adapter, enabling both local and remote I/O configurations. It works with standard 1756 chassis and uses the common 36-pin RTB form factor, simplifying spares management. Its electronic keying ensures correct installation, and its isolated inputs make it suitable for diverse industrial signal sources.
Buying Guide
When purchasing a 1756-IA16I, verify that your system uses ControlLogix architecture and that you have the correct terminal block housing (1756-TBCH or 1756-TBS6H). Consider your input voltage requirements—this module is designed for 120V AC. For genuine Allen-Bradley parts and fast delivery, choose PLC Source PRO for your automation spares needs.