Overview
The Allen-Bradley 1756-IA32 is a ControlLogix digital input module manufactured by Rockwell Automation. This AC input module features thirty-two (32) input channels, accepting signal voltage range of 74-132VAC in two groups of sixteen (16) channels each group. It may be installed to a 1756 local or distributed I/O chassis. This AC input module has a display where users can check its input and communication status, as well as the module health.
Key Features
- Group-to-group isolation, allowing the module to function even if a group has malfunctioned
- Input to backplane isolation (no isolation between input channels)
- Fixed hardware delay of 1.5 ms OFF to ON transition and 1 ms ON to OFF transition; user-configurable delay with filter time options of 1 ms or 2 ms for OFF to ON and 9 ms or 18 ms for ON to OFF
- Current draw at 24V is 2mA and 165 mA at 5.1V
- Continuous isolation voltage of 250V; voltage category is 120V AC and 50/60Hz
Technical Specifications
- Input Voltage: 74-132V AC, 47-63 Hz
- Input Points: 32 channels (2 groups of 16 points each)
- Current Draw: 2 mA @ 24V; 165 mA @ 5.1V
- Backplane Power: 0.9W total
- Maximum Inrush Current: 390 mA
- Operating Temperature: 0-60°C
- Response Time: 1-18 milliseconds (configurable)
- Isolation Voltage: 250V (continuous)
- Mounting Type: Chassis-mounted (1756 I/O)
- On-State Current (max): 15 mA @ 132V AC
- Off-State Voltage (max): 20V
Typical Applications
The Allen-Bradley 1756-IA32 is primarily used to interface input or signaling devices that provides AC input signals with range of 74-132VAC. Common applications include:
- Distributed automation and process control systems
- High-density signal acquisition from AC-powered sensors and switches
- Industrial machinery control requiring multi-group isolation
- Manufacturing systems using legacy or mixed AC/DC control signals
Compatibility & Replacements
Compatible With
- 1756 local I/O chassis
- 1756 distributed I/O chassis
- ControlLogix Programmable Automation Controller (PAC) family
- Studio 5000 Logix Designer programming environment
- Bulletin 1756 ControlLogix I/O module ecosystem
Replaces / Drop-In Replacement For
The 1756-IA32 is the successor to earlier discrete input modules in the 1756 family. Verify compatibility with your system integrator before substituting alternative models. No direct drop-in replacements exist—this is a standard module upgrade path.
Works With
- Studio 5000 Logix Designer (CompactLogix and ControlLogix controllers)
- 1756 Firmware v3.004 and later
- Compatible removable terminal block housings: 1756-TBCH and 1756-TBS6H
- Supported by Rockwell Automation’s Add On Profiles (AOP) for 1756 Discrete I/O
