Product Introduction
In industrial automation, reliable output modules are critical for controlling actuators, valves, and indicators. The Allen-Bradley 1794-OB16 Flex I/O Digital DC Output Module provides a cost-effective solution with 16 sourcing channels, ensuring long service life and low power dissipation, reducing overall operational costs.
Technical Specifications
The Allen-Bradley 1794-OB16 module is built for robust performance in demanding environments. Below are its key technical parameters from the manufacturer:
| Specification |
Value |
| Number of Outputs |
16, sourcing |
| On-state Voltage, min |
10 VDC |
| On-state Voltage, nom |
24 VDC |
| On-state Voltage, max |
31.2 VDC |
| Output Current per Channel |
500 mA max. |
| Total Output Current Rating |
8.0 A |
| On-state Voltage Drop |
0.5 VDC max. |
| Off-state Leakage Current |
0.5 mA max. |
| Isolation Voltage |
50 V continuous |
| FlexBus Current |
80 mA @ 5 VDC |
| Power Dissipation |
5.3 W @ 31.2 VDC max. |
| Thermal Dissipation |
18.1 BTU/hr @ 31.2 VDC max. |
| Operating Temperature |
0 to 55 °C (32 to 131 °F) |
| Storage Temperature |
-40 to 85 °C (-40 to 185 °F) |
| Vibration |
5g @ 10 to 500 Hz |
| Operating Shock |
30 g |
| Indicators |
16 yellow status LEDs |
| Mounting |
DIN Rail |
| Enclosure |
Open-type |
| Dimensions (H x W x D) |
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in) |
| Weight |
78 g (2.75 oz) |
Industry Applications
The Allen-Bradley 1794-OB16 module excels in discrete manufacturing, material handling, and packaging lines. With 16 sourcing outputs at 24 VDC, it directly drives solenoid valves, pilot lights, and contactors. Its low power dissipation (5.3 W max) minimizes heat buildup in control cabinets, contributing to energy savings and extended component life—key benefits for cost-conscious operations.
Installation & Setup
Mount the Allen-Bradley 1794-OB16 on a DIN rail using any compatible 1794 terminal base (TB2, TB3, TB3S, TB3K, TB3SK). Ensure the keyswitch is set to position 2 for proper alignment. Wire size depends on the chosen terminal base. The module supports source wiring configuration and requires an external fuse (recommended SAN-O MQ4-800 mA) since it lacks internal fusing. Up to eight 1794-OB16 modules can reside in a single Flex I/O rack.
Maintenance & Reliability
Routine inspection of the LED indicators (16 yellow status LEDs) allows quick diagnosis of channel health. The open-type enclosure requires a clean, dry environment to maintain reliability. The Allen-Bradley 1794-OB16 operates from 0 to 55 °C and withstands 5g vibration, ensuring uptime in typical industrial settings. The low thermal dissipation reduces stress on nearby components, further enhancing system reliability and lowering total cost of ownership.
Compatibility & Integration
The Allen-Bradley 1794-OB16 works with any 1794 Flex I/O adapter for distributed I/O applications. It also functions as local I/O for FlexLogix controllers via the 1794-FLA extender. The module communicates over the FlexBus backplane, consuming 80 mA at 5 VDC. It is compatible with terminal bases listed above and fits seamlessly into existing Allen‑Bradley control architectures.
Selection Guide & Purchasing Advice
When selecting the Allen-Bradley 1794-OB16, verify your system voltage is within 10–31.2 VDC and that you have the correct terminal base. Consider external fusing for each output group as needed. For genuine parts and expert support, trust UBEST Automation—a reliable supplier of industrial automation spares. Ensure your order includes the module and required terminal base.