Product Overview
The Allen-Bradley 1794-OB16P is a Flex I/O digital DC output module designed for industrial automation systems. It provides 16 current sourcing outputs at 24VDC nominal voltage, making it suitable for energizing indicator lights, solenoid valves, relay coils, and other 24VDC field devices. Each output channel is electronically fused for protection, reducing the risk of damage from overloads.
Technical Specifications Breakdown
Key parameters for the 1794-OB16P are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | Discrete Outputs |
| Number of Channels | 16 Sourcing |
| On-state Voltage (nominal) | 24V DC |
| On-state Current (max per channel) | 500mA |
| Output Current Rating (per module) | 8.0A |
| On-state Voltage Drop (max) | 0.5V DC |
| Off-state Leakage Current (max) | 0.5mA |
| Isolation Voltage | 50V Continuous |
| Flexbus Current | 60 mA @ 5V DC |
| Power Dissipation | 5.0 W @ 31.2V DC |
| Thermal Dissipation | 17.0 BTU/hr @ 31.2V DC |
Industry Applications
The 1794-OB16P module excels in discrete control applications within manufacturing, processing, and material handling environments. Its 16 sourcing outputs can drive multiple 24VDC loads simultaneously, such as indicator lamps on a control panel or solenoid valves in a pneumatic system. The electronic fusing on each channel minimizes downtime by preventing a single fault from disabling the entire module.
Installation & Setup Guidance
Mount the 1794-OB16P on a DIN rail using a compatible terminal base. The module requires a terminal base for DIN rail attachment and I/O termination. Compatible terminal bases include 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK. Wire size is determined by the installed terminal base. The module operates with an external DC supply voltage range of 10 to 31.2VDC. Ensure the Flexbus current of 60 mA @ 5V DC is available from the communication adapter.
Maintenance & Reliability
The 1794-OB16P is designed for reliable operation in industrial environments. Its operating temperature range is 0 to 55 °C (32 to 131 °F), and storage temperature range is -40 to 85 °C (-40 to 185 °F). The module withstands vibration of 5g @ 10 to 500 Hz and operating shock of 30 g. Periodically inspect the module for signs of damage or contamination and ensure the DIN rail mounting is secure.
Compatibility & Integration
The 1794-OB16P integrates with Flex I/O communication adapters supporting ControlNet, DeviceNet, PROFIBUS, and EtherNet/IP. It can be used as distributed I/O with Logix controllers such as ControlLogix and CompactLogix, as well as legacy controllers like PLC5 and SLC500. The module can be mixed with other Flex I/O modules in the same rack for flexible I/O architectures.
Selection Guide & Purchasing Advice
When selecting the 1794-OB16P, verify that your application requires 16 sourcing outputs at 24VDC with a maximum of 500mA per channel. Ensure your system provides the necessary Flexbus current and that a compatible terminal base is available. SpareTechPLC offers this module along with technical support to help you integrate it into your automation system.
Troubleshooting & Common Issues
If an output channel fails to energize, check the electronic fuse status via the yellow status indicators. Verify the external DC supply voltage is within 10 to 31.2VDC. If the module does not communicate, confirm the Flexbus connection and that the communication adapter is properly configured. For persistent issues, consult the product manual or contact SpareTechPLC for assistance.
