The Allen-Bradley 1746-IM16 is a high-voltage discrete input module engineered for the SLC 500 programmable controller platform. This unit provides sixteen independent input points, allowing the PLC to monitor the status of various field devices operating on 200/240V AC power. By converting high-level AC signals into logic-level data for the processor, the 1746-IM16 facilitates the seamless integration of heavy machinery, limit switches, and motor starters into the automated control architecture.
Because this module targets high-voltage applications, it incorporates rigorous electrical safety features, including substantial isolation between field-side wiring and the sensitive backplane logic. This robust design ensures that electrical transients or noise from the factory floor do not compromise the integrity of the central processing unit. Although Rockwell Automation moved the SLC 500 series to legacy status in 2016, the 1746-IM16 remains a fundamental component for maintaining and repairing existing 240V control systems.
Technical Specifications
| Feature | Detailed Specification |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model Number | 1746-IM16 |
| Module Type | Digital AC Input |
| Number of Inputs | 16 Points |
| Nominal Input Voltage | 200V / 240V AC |
| Operating Voltage Range | 170V to 265V AC (47-63 Hz) |
| Backplane Current (5V DC) | 85 mA |
| Max Off-State Voltage | 50V AC |
| Signal Delay (On/Off) | 35ms (Max On), 45ms (Max Off) |
| Isolation Voltage | 1500V AC (Field-to-Backplane) |
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