Overview
The Allen-Bradley 1746-IB16 is a discrete digital input module designed for the SLC 500 modular PLC platform. This module provides 16 non-isolated current-sinking input points in a single group with common termination. Operating across 10–30V DC, it is a standard industrial I/O solution for real-time discrete signal acquisition in automation control systems.
Key Features
- 16 sinking input channels with single common
- Optical-electro isolation of 1500V separates control logic from input terminals
- Maximum signal delay of 8 milliseconds for responsive input processing
- Low backplane current consumption: 50mA at 5V, 0mA at 24V
- Surge protection and input filtering for reliable operation in noisy environments
- Color-coded removable terminal block for simplified wiring
- 16 individually-numbered LEDs indicate input channel status
Technical Specifications
Rated at 24 Volts DC with acceptable input range of 10 to 30 Volts DC (sink). Each input channel nominal current is 8 milliamps at 24 Volts DC. Maximum backplane current draw is 0.085 Amps at 5 Volts DC with maximum inrush rating of 0.8 Amps. Thermal dissipation per point is 0.2W, with minimum dissipation of 0.425W and maximum of 3.60W. UL 508 listed and CSA 22.2 142 approved, meeting industrial safety standards.
Typical Applications
- Discrete sensor input acquisition (limit switches, proximity sensors, pushbuttons)
- Equipment status monitoring and alarm signaling
- Material handling and conveyor control
- Motor control interlocking circuits
- General-purpose industrial automation and process control
- Hazardous environment applications per NEMA noise immunity standards
Compatibility & Replacements
Compatible With
- Allen-Bradley SLC 500 modular controllers (all revisions)
- SLC 5/01, 5/02, 5/03, 5/04, 5/05 processors
- Allen-Bradley automation rack chassis
- RSLogix 500 programming software
Replaces / Drop-In Replacement For
The 1746-IB16 is a standard legacy module. Direct equivalents within the SLC 500 family include alternative 16-point input modules. Verify compatibility with your specific SLC 500 configuration before ordering. For modern applications, Compact LogiX or ControlLogix platforms offer updated I/O options.
Works With
- RSLogix 500 and RSLogix Micro programming environments
- Allen-Bradley HHT (Hand-Held Terminator) field devices
- Discrete 24V DC input field wiring
- SLC 500 backplane communication (proprietary Allen-Bradley bus)
