Product Overview
The Allen-Bradley 1756-OB16IEF is a ControlLogix DC output module engineered for high-speed peer-to-peer control in demanding industrial environments. With 16 individually isolated 24V DC outputs (10-30V DC range) and a response time under 25µs, this module delivers the precision and reliability required for modern automation systems. Whether you are upgrading an existing line or designing a new application, the 1756-OB16IEF ensures fast, accurate output switching with robust fault protection.
Key Features
- 16 isolated digital outputs with electronic fusing per point
- Supports Pulse Width Modulation (PWM) for precise control
- Response time less than 25µs for rapid system transitions
- Configurable fault-mode states: Hold, Last State, On, or Off
- Diagnostic status indicators for easy troubleshooting
- Compatible with 1756-TBCH and 1756-TBS6H terminal blocks
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1756-OB16IEF |
| Series |
ControlLogix |
| Module Type |
DC Output Module |
| Circuit Type |
DC |
| Input Voltage Range |
10-30 Volts |
| Operating Voltage Range |
10-30 Volts DC |
| Max Output Current per Point |
2 A at 30°C, 1 A at 60°C |
| Max Output Current per Module |
8 A at 30°C, 4 A at 60°C |
| Power Dissipation (Max) |
3.6 W at 60°C |
| Backplane Current at 5V |
350 mA |
| Backplane Current at 24V |
3 mA |
| Isolation Voltage |
50V Continuous |
| Enclosure |
None |
Applications
The 1756-OB16IEF excels in applications requiring fast, isolated switching, such as:
- High-speed packaging machinery where precise timing is critical
- Material handling systems needing rapid actuator control
- Process control systems requiring reliable per-point isolation
Its PWM capability also makes it suitable for applications needing variable duty-cycle control, such as heating elements or light dimming in industrial settings.
Installation & Setup
Before mounting the 1756-OB16IEF to the chassis, you must install a removable terminal block (RTB). Only the 1756-TBCH and 1756-TBS6H RTBs are compatible. Ensure the module is properly seated and locked into the ControlLogix chassis. Connect wiring according to your application's voltage and current requirements, respecting the specified ratings.
Maintenance & Reliability
Routine inspection of the module's status indicators helps detect faults early. Keep the module free from dust and moisture to maintain isolation integrity. Because the 1756-OB16IEF features electronic fusing and per-point protection, downtime is minimized. Regular checks of terminal block connections prevent loose wiring issues.
Compatibility & Integration
As a ControlLogix module, the 1756-OB16IEF integrates seamlessly with ControlLogix processors. It supports CIP Sync as a slave-only device, requiring a master clock module on the network for time synchronization. This makes it ideal for coordinated motion and event-driven applications.
Buying Guide
When purchasing the 1756-OB16IEF, verify the part number and ensure it matches your system requirements. Confirm that your chassis supports the module and that you have the correct RTB. For genuine Allen-Bradley parts and expert support, consider PLC Source PRO as your reliable supplier.