Product Summary
The Allen-Bradley 1746-OB16E provides 16 high-current DC outputs for your SLC 500 system. This module delivers 1 amp per output with electronic fusing. It operates on 10-30V DC source voltage. The module fits any slot in a 1746 chassis. You get reliable switching with a 1ms signal delay time.
Expert Technical Evaluation & Performance Review
Robust Output Drive Capabilities
The 1746-OB16E excels at driving high-current DC loads. Each of its 16 outputs handles 1.0 amp continuously. The total module current reaches 8 amps. This capacity suits demanding actuator and relay banks. You get a 2.0 amp inrush current per point for 2ms. This handles initial load surges without tripping.
Precision Switching and Protection
This module offers exceptional switching performance. The step response is 60 milliseconds on and 2.5 milliseconds off. Signal delay time stays load-dependent at just 1ms. The OFF-state leakage current is only 1mA. Electronic fusing protects each output from overcurrent damage. This feature reduces downtime and protects field wiring.
Environmental and Electrical Robustness
The 1746-OB16E operates reliably in harsh conditions. It functions from 0 to 60 °C with 5-95% humidity. The module withstands 2.5G vibration at 10-200Hz. It also handles a 30G shock rating. NEMA ICS 2-230 noise immunity ensures stable operation in noisy plants. Total heat dissipation is 7.6W, keeping your cabinet cool.
Installation and Wiring Guide
Chassis Mounting and Backplane Setup
Install the 1746-OB16E into any available slot in your 1746 chassis. The module draws only 135 milliamps from the 5V backplane. This low draw leaves power for other modules. Secure the module firmly to ensure proper backplane connection. The module uses a Removable Terminal Block (RTB) for easy wiring.
Wiring Your Outputs Correctly
Connect your 10-30V DC source to the module's power terminals. Wire each output point to your load device. Ensure each load draws at least 1mA minimum current. For inductive loads, install a flyback diode. This protects the output from voltage spikes. The RTB allows you to pre-wire and swap modules quickly.
Step Response and Timing Considerations
Account for the module's timing in your control logic. The ON step response is 60 milliseconds. The OFF step response is just 2.5 milliseconds. This fast OFF time is critical for precise control. The 1ms signal delay is consistent for both ON and OFF states. Plan your scan cycles accordingly for accurate actuation.
Logistics & Standard Packaging Details
- One Allen-Bradley 1746-OB16E Digital DC Output Module
- One Removable Terminal Block (RTB) for field wiring
- Product documentation and installation guide
- Static-safe packaging for secure transport
- Express delivery shipping is available via FedEx, UPS, and DHL
