Allen-Bradley 1756-IA32 | ControlLogix I/O Module

Overview

The 1756-IA32 is a ControlLogix input module from Allen-Bradley designed for reliable AC signal processing. It provides 32 input points organized in two groups of 16, supporting applications that demand precise and stable data handling in industrial environments.

Electrical Characteristics

The module operates within an input voltage range of 74 to 132 Volts AC at 47–63 Hertz, with a nominal 120 Volts AC rating. It draws 165 milliamperes at 5.1 Volts and 2 milliamperes at 24 Volts, resulting in a total backplane power of 0.9 Watts. Additionally, it dissipates up to 6.1 Watts at 60°C and releases 20.8 BTU per hour.

Input and Signal Performance

For accurate timing, the 1756-IA32 offers a hardware off-to-on delay of 1.5 ms nominal and 10 ms maximum, with user-selectable filters of 1 or 2 ms. The on-to-off delay is 1 ms typical and 8 ms maximum, with configurable filters of 9 or 18 ms. The module maintains an off-state maximum voltage of 20 Volts and a leakage current limit of 2.5 mA. In the on state, it requires at least 5 mA at 74 Volts AC and supports up to 15 mA at 132 Volts AC.

Integration and Compatibility

The 1756-IA32 is mounted within a ControlLogix chassis and requires either a removable terminal block (RTB) or a Bulletin 1492 interface module (IFM) for proper wiring integration. It supports listen-only communication formats, making it suitable for flexible system architectures. In addition, the module can process CST timestamped input data, ensuring synchronization with the local chassis system clock whenever inputs change.

Environmental and Operational Notes

Manufactured in Malaysia, the 1756-IA32 is designed for dependable operation in industrial control environments. Its inrush current capacity reaches 390 mA, ensuring stable startup conditions. The efficient power design, combined with flexible filter options, enables consistent input signal processing across a wide range of AC control applications.