Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-IA32 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | Digital AC Input Module |
| Number of Inputs | 32 (16 points per common) |
| On-State Voltage Range | 74–132V AC, 47–63 Hz |
| Nominal Input Voltage | 120V AC |
| Off-State Voltage | 20V AC maximum |
| On-State Current | 5mA @ 74V AC min; 15mA @ 132V AC max |
| Backplane Current | 165mA @ 5.1V DC; 2.0mA @ 24V DC |
| Backplane Power | 0.9W |
| Maximum Power Dissipation | 6.1W @ 60°C |
| Isolation Voltage | 250V continuous (group-to-group and user-to-system) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| RTB Compatibility | 1756-TBCH (36-position cage clamp) or 1756-TBS6H (spring clamp) |
Main Features and Advantages
Native 120V AC Input Capability: The 1756-IA32 accepts 74–132V AC signals directly, eliminating the need for external signal conditioners or interposing relays when interfacing with standard 120V AC control circuits. This reduces component count, panel space, and potential failure points in systems where AC pilot devices are specified.
Grouped Isolation Architecture: With two isolated groups of 16 inputs, the 1756-IA32 allows separate AC control circuits to be monitored by a single module while maintaining 250V continuous isolation between groups. This is particularly useful in panels where multiple control power sources or separately derived AC circuits coexist, preventing unintended common-mode paths.
Configurable Filtering and Diagnostics: The module supports user-selectable input filter times (1ms or 2ms for OFF-to-ON, 9ms or 18ms for ON-to-OFF), allowing engineers to tune response characteristics to match mechanical switch bounce or noisy field wiring. Change-of-state and timestamp diagnostics are software-configurable, with timestamp resolution of ±200μs, enabling precise sequence-of-events recording for troubleshooting intermittent field signals.
Removable Terminal Block Design: The 1756-IA32 uses a separately ordered 36-position Removable Terminal Block, available in cage clamp or spring clamp styles. This design permits pre-wiring of field connections on the RTB before module installation and allows module replacement without disturbing field wiring—a critical advantage in continuous-process industries where downtime must be minimized.
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