Product Overview
The Allen-Bradley 1746-IB16 is a 16-channel Digital DC Sinking Input module designed for the SLC 500 programmable logic controller family. This compact module provides reliable interfacing with limit switches, proximity sensors, pushbuttons, and other 24VDC signal devices. With a nominal input voltage of 24VDC and a wide operating range of 10-30VDC, the 1746-IB16 offers flexibility in various industrial environments. Its sinking wiring configuration and single common terminal simplify installation and reduce wiring complexity.
Technical Specifications
| Parameter |
Value |
| Module Type |
Digital DC Sinking Input |
| Number of Inputs |
16 (sinking) |
| Input Voltage Range |
10–30 VDC |
| Nominal Input Voltage |
24 VDC |
| Input Current (nominal) |
8 mA @ 24 VDC |
| Signal Delay (ON/OFF) |
8 ms |
| Backplane Current (5 VDC) |
85 mA |
| Off-State Voltage (max) |
5.0 VDC |
| Off-State Current (max) |
1 mA |
| Thermal Dissipation per Channel |
0.20 W |
| I/O Connection |
1746-HT, 1746-HCA |
| Operating Temperature |
0 to 60 °C (32 to 140 °F) |
| Storage Temperature |
-40 to 85 °C (-40 to 185 °F) |
| Relative Humidity |
5–95% (non-condensing) |
| Shock Rating |
30G operational |
| Vibration Rating |
2.5G @ 57–200 Hz |
| Isolation |
1500V electro-optical |
| Certifications |
UL, CSA, CE, C-UL Class I Div 2 |
Industry Applications
The Allen-Bradley 1746-IB16 provides cost-effective digital input monitoring in manufacturing, packaging, material handling, and process control systems. Its 16 sinking inputs efficiently capture discrete signals from pushbuttons, limit switches, and proximity sensors in conveyor lines or assembly stations. With a fast 8 ms signal delay, the 1746-IB16 ensures real-time response for critical interlocks and safety circuits, reducing downtime and improving overall equipment effectiveness (OEE).
Installation & Setup
The 1746-IB16 installs directly into any I/O slot of a 1746 chassis (local or remote). Connect field devices using the recommended 1746-HT or 1746-HCA terminal blocks. Maintain proper wiring polarity for sinking inputs and avoid exceeding 30 VDC. For remote installations, pair the module with a 1746 communication adapter (RIO or Ethernet) for distributed I/O configurations. Always power down the chassis before inserting or removing the module.
Maintenance & Reliability
The 1746-IB16 features status LED indicators for each channel, simplifying troubleshooting and reducing mean time to repair (MTTR). Its rugged design withstands 30G shock and 2.5G vibration, making it suitable for harsh industrial environments. Routine inspection of terminal connections and cleaning of the front panel every six months ensures long-term reliability. The module's low thermal dissipation (0.20 W per channel) minimizes heat buildup in the enclosure, extending component life.
Selection Guide
When selecting the Allen-Bradley 1746-IB16, verify compatibility with your SLC 500 CPU and chassis type. Confirm the number of I/O points required and ensure the power supply can handle the total backplane current (85 mA per module at 5 VDC). For sinking input applications, the 1746-IB16 is a direct replacement for older 1746-IB8 or 1746-IB32 modules in many systems. UBEST Automation offers this module with full traceability and fast shipping. Contact ubest101 for bulk pricing or technical support.