Product Overview
The Allen-Bradley 1746-IN16 is a SLC 500 Digital AC/DC Input Module engineered for precise discrete signal acquisition in industrial control systems. With sixteen (16) input channels and a voltage range of 24 VAC / VDC, this module delivers dependable performance for monitoring limit switches, push buttons, and proximity sensors. As part of the trusted SLC 500 family, the 1746-IN16 occupies a single slot in any 1746 chassis, simplifying installation and reducing panel space requirements.
Technical Specifications
Every parameter of the 1746-IN16 is designed to ensure accurate and repeatable operation. Below are the key specifications:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1746-IN16 |
| Series |
SLC 500 |
| Operating Voltage |
24 Volts AC/DC Sink |
| Module Type |
Digital DC Input Module |
| Voltage Range |
24 VDC / 24 VAC |
| Inputs |
16 |
| Signal Delay (AC) |
25 ms |
| Signal Delay (DC) |
15 ms |
| Backplane Current (5V DC) |
0.085 A |
| Off State Current |
1 milliamps |
| Nominal Input Current |
8 mA @ 24V DC; 8 mA @ 24V AC |
| Step Response |
100 ms in, 2.5 ms out |
| Watts Per Point |
0.35 |
| Minimum Watts |
0.425 |
| Total Watts |
6 |
| I/O Connection |
1746-HT and 1746-HCA |
| UPC |
10662468092743 |
Key Features & Benefits
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16 discrete inputs for flexible field wiring.
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Dual AC/DC operation (24 VAC/VDC) reduces inventory requirements.
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Per-channel LED indicators provide immediate visual status for fast troubleshooting.
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Single-slot design maximizes chassis space utilization.
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Reliable signal delays (15 ms DC, 25 ms AC) ensure consistent response times.
Industrial Applications
In manufacturing lines, the 1746-IN16 interfaces with push buttons, selector switches, and limit switches to feed status information into the PLC. Packaging machinery uses this module to monitor sensor outputs for product presence and positioning. Additionally, the module is well-suited for material handling systems where discrete inputs from photoeyes and proximity detectors trigger conveyor operations. Its ability to handle both AC and DC signals makes it a versatile choice for retrofitting older panels.
Installation & Setup
Installing the 1746-IN16 is straightforward. First, ensure the SLC 500 chassis is powered down. Align the module’s male connectors with the chassis backplane bus and firmly push the module into the slot until it locks. Secure the module using the built-in screws. For wiring, use the recommended I/O connection cables 1746-HT and 1746-HCA to connect field devices. Verify that the input voltage matches the module’s 24 VAC/VDC rating before powering up. After installation, use the LED indicators to confirm each channel’s status.
Compatibility & Integration
The 1746-IN16 is designed for the Allen-Bradley SLC 500 platform. It can be installed in any 1746 chassis, either in the local rack with the processor or in an expansion rack. This module works with SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processors when configured appropriately. The module uses the standard SLC 500 backplane interface, so no additional adapters are required.
Maintenance & Reliability
To ensure long-term reliability, periodically inspect the 1746-IN16 for dust accumulation and verify that all terminal connections remain tight. Check the LED indicators during routine maintenance to confirm proper channel operation. The module’s robust design minimizes failures, but if a channel fails, the LED will remain off, allowing quick identification. Keep spare fuses or replacement modules on hand to reduce downtime.
Buying Guide
Before purchasing the 1746-IN16, confirm that your system uses the SLC 500 platform and that you have an available single slot in your chassis. Verify the input voltage matches your field devices. For large quantities or custom requirements, contact PLC Source PRO for availability and competitive pricing.