Overview
The Allen-Bradley 1746-IA16 is a digital AC input module for the SLC 500 I/O family. This 16-point input module interfaces discrete AC-powered field devices (limit switches, push buttons, solenoids, proximity sensors) directly with SLC 500 fixed or modular chassis controllers. The removable terminal block eliminates rewiring during installation or module replacement, making it ideal for maintenance-critical environments.
Key Features
- 16 AC Input Channels: Accepts 85–132 VAC signals at 47–63 Hz
- Compact Single-Slot Design: Occupies one slot in standard or expansion SLC 500 chassis
- Removable Terminal Block: Twenty screw terminals with two internally wired commons; quick disconnect for ease of maintenance
- Built-in Filtering & Isolation: Surge protection and optical coupling reduce noise in harsh industrial environments
- LED Status Indicators: Individual input channel status lights for quick troubleshooting
- Backplane-Powered Operation: 5 VDC supply from SLC chassis simplifies wiring
Technical Specifications
- Input Voltage Range: 85–132 VAC @ 47–63 Hz (nominal 100–120 VAC)
- Number of Inputs: 16 channels, 16 points per common
- Input Current (Nominal): 12 mA @ 120 VAC
- Signal Delay (Max): ON-delay 35 ms; OFF-delay 45 ms
- Backplane Current Draw: 85 mA @ 5 VDC
- Power Consumption: 0.27–0.425 W per point; 4.8 W total
- OFF-State Voltage/Current: 30 VAC max / 2 mA max
- Inrush Current: 0.8 mA max @ 500 µs duration
- Dimensions: 5 × 2 × 6 inches (13 × 5 × 15 cm)
- Weight: 0.34 kg
- Operating Temperature: 0–60 °C (32–140 °F)
- Certifications: GOST, KC, Marine
Typical Applications
The Allen-Bradley 1746-IA16 is commonly deployed in:
- Manufacturing automation and assembly line control
- Motor starter interlocks and safety circuits
- Discrete process monitoring (pressure switches, flow sensors, limit switches)
- HVAC and facility automation systems
- Retrofit and legacy system maintenance
- Machine tool and material handling equipment control
Compatibility & Replacements
Compatible With
- SLC 500 fixed chassis (1746-A2, 1746-A4, 1746-A13)
- SLC 500 modular chassis (1746-P4, 1746-P5)
- SLC 500 expansion racks
- All SLC 500 processors (1747-L511, 1747-L512, 1747-L514, 1747-L521, etc.)
- Ladder Logic and structured text programming via Studio 5000 Logix Designer
- EtherNet/IP and DH+ network integration via gateway modules
Replaces / Drop-In Replacement For
- 1746-IA16 Series B (earlier revision)
- 1746-IA16 Series D (compatible pinout, plug-compatible in chassis)
- 1746IA16 (alternative part marking)
Works With
- RSLogix 500 and Studio 5000 Logix Designer programming software
- SLC 500 ladder logic and structured text
- EtherNet/IP gateway modules (1756-EN2*)
- Remote I/O adapters for distributed control
- Standard 120 VAC industrial input devices (switches, sensor outputs, solenoid auxiliaries)
