Technical Description: Allen-Bradley 1746-IB16
The Allen-Bradley 1746-IB16 is a 16-point digital DC input module engineered for the SLC 500™ modular hardware platform. This module is designed for 24V DC sinking configurations, meaning it receives current from field devices that «source» the signal. It is an essential interface for high-speed digital feedback in automated machinery, providing the PLC with real-time status updates from sensors and actuators.
Core Functionality and Design
The 1746-IB16 features optical isolation between the field-side wiring and the logic-side backplane, preventing damage to the CPU from external surges. The module’s 16 points are organized into a single group with a common return, simplifying the wiring architecture within the control cabinet. Its low power consumption of 0.050A at 5V DC allows for dense I/O configurations without overstressing the 1746 power supply.
Key Specifications
- Number of Inputs: 16 Points.
- Voltage Category: 24V DC (Sinking).
- Operating Voltage Range: 10–30V DC.
- Backplane Current (5V DC): 0.050 A.
- Off-State Voltage (Max): 5V DC.
- On-State Current (Min): 8 mA at 10V DC.
- Input Delay (Max): 8ms (on/off).
Installation and Maintenance
The 1746-IB16 includes a removable terminal block (RTB), which allows for «cold-swapping» the module without removing any wires. This feature is vital for maintenance teams looking to reduce Mean Time to Repair (MTTR). The module also features front-panel LEDs that provide instant visual diagnostics for each of the 16 input points, facilitating rapid troubleshooting of field wiring issues.
| Feature | Detail |
| Input Type | Current Sinking |
| Response Time | 8 ms typical |
| Wire Size | 14 AWG (2.1 mm²) max |
Operational Advantage
Because of its 24V DC rating, the 1746-IB16 is compatible with a vast array of industrial sensors, including PNP-type encoders and proximity switches. Its rugged design ensures long-term performance in high-vibration and temperature-variant environments typical of the manufacturing sector.
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For 24V DC sensing, this 16-point module fits securely into the 1746-A4 compact chassis.
