Industry Trends in Discrete Output Modules
The demand for flexible and reliable discrete output modules continues to grow as manufacturers seek to optimize machine performance and reduce downtime. In modern industrial environments, individually isolated outputs provide critical advantages by allowing different voltage sources on each channel and preventing fault propagation. The Allen-Bradley 1756-OB16I addresses these needs with its 16-point isolated design, supporting both sinking and sourcing configurations.
Introducing the 1756-OB16I
When engineers require precise control over multiple loads with electrical isolation, the Allen-Bradley 1756-OB16I ControlLogix isolated DC output module delivers a robust solution. This module features 16 individually isolated outputs, each capable of handling up to 2 A at 30 °C with linear derating to 1 A at 60 °C. It operates within a voltage range of 10-30 VDC, making it suitable for a wide variety of 12/24V DC applications.
Technical Specifications Analysis
The 1756-OB16I offers a maximum output current per module of 8 A at 30 °C and 4 A at 60 °C, with a power dissipation of 3.6 Watts at 60 °C. Its backplane current draw is 350 mA at 5 Volts and 3 mA at 24 Volts, ensuring efficient integration into ControlLogix chassis. Output delay times are 1 ms maximum from OFF to ON and 2 ms maximum from ON to OFF, providing fast response for critical processes.
Application Scenarios and Use Cases
In manufacturing lines, the 1756-OB16I can energize relays, pilot lamps, and solenoids with individual isolation to prevent ground loops. For process control, its configurable safe state positions—Hold Last State, On, or Off—allow safe operation when the controller changes to Program or Fault mode. This module is also ideal for driving indicators and buzzers in material handling systems.
Compatibility and Integration
The 1756-OB16I integrates seamlessly with ControlLogix local and remote chassis using removable terminal blocks 1756-TBCH or 1756-TBS6H, both 36-pin. It supports multiple communication formats including output data, listen-only output data, rack optimization, and scheduled output data. The module's isolation voltage is 50 Volts continuous between outputs and backplane, enhancing system reliability.
Comparison with Similar Modules
Compared to non-isolated output modules, the 1756-OB16I provides individual channel isolation, allowing different voltage sources per point. While some modules offer higher current per module, the 1756-OB16I's linear derating from 2 A per point at 30 °C to 1 A at 60 °C ensures stable performance across temperature ranges. Its 16-point density balances channel count with physical footprint.
Company Strength and Supply Assurance
Petro Auto Tech specializes in providing authentic industrial automation parts like the Allen-Bradley 1756-OB16I. With a focus on quality and availability, we help customers maintain and upgrade their systems efficiently. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.
Frequently Asked Questions About the 1756-OB16I
What is the operating voltage range of the 1756-OB16I? The module operates at 10-30 VDC, supporting 12/24V DC sink-source configurations.
How many outputs does the 1756-OB16I have and are they isolated? It has 16 individually isolated outputs, allowing independent wiring of different voltage sources.
What removable terminal blocks are compatible with the 1756-OB16I? Compatible RTBs are 1756-TBCH and 1756-TBS6H, both 36-pin housings.
What is the maximum current per point at 60 °C? At 60 °C, the maximum current per point is 1 A, with linear derating from 2 A at 30 °C.
