Overview
The Allen-Bradley 1794-OB16P is a Flex I/O digital output module designed for applications requiring 16 channels of 24VDC source outputs. This module integrates into distributed I/O architectures, providing electronically protected outputs for controlling solenoids, indicator lights, relay coils, and other 24VDC field devices. Its compact design and modular construction simplify system expansion and replacement in production environments.
Key Features
- 16 Source Output Channels — Sixteen (16) Current sourcing outputs, providing 24VDC voltage output
- Electronic Protection — Each channel is equipped with electronic fusing
- High Current Rating — Each channel has a minimum output rating of 1.0 mA and maximum of 500 mA per channel
- Surge Withstand — Each channel is capable of withstanding surge current of 2 A for 50 ms, repeatable for every 2 seconds
- Low Bus Power Demand — Requires a FlexBus current of 60 mA @ 5V DC and with maximum power dissipation of 5.0 W @ 31.2V DC
- Flexible Wiring Options — Mounts on a DIN rail, requiring specific terminal bases such as 1794-TB3 or 1794-TB3S
Technical Specifications
- Output Voltage: 24VDC
- Number of Outputs: 16
- Output Type: Source (Current Sourcing)
- Minimum Output: 1.0 mA per channel
- Maximum Output: 500 mA per channel
- Maximum Surge Current: 2.0 A for 50 ms
- External Supply Voltage Range: 10–31.2 VDC
- FlexBus Current: 60 mA @ 5V DC
- Power Dissipation: 5.0 W @ 31.2V DC
- Thermal Dissipation: 17.0 BTU/hr @ 31.2V DC
- Response Time: 1 millisecond
- Operating Temperature: 32–131°F (0–55°C)
- Mounting: DIN Rail
- Protection Rating: IP20
- Certifications: UL, CSA, CE, CUL, C-TICK, GOST, KC, Marine
- Product Family: FLEX I/O
- Weight: Approximately 0.13–0.22 lbs
Typical Applications
Used to energize electrical components that operate in 24VDC voltage categories such as indicator light and lamps, solenoid actuated devices, relay coils, and other field instruments. The module is particularly effective in distributed I/O architectures where modular output expansion is required without replacing main controller hardware. Common uses include motor starters, pneumatic valve control, stack light activation, and process equipment interlocking.
Compatibility & Replacements
Compatible With
- Flex I/O Base units and adapters
- CompactLogix and ControlLogix controllers via Flex I/O communication networks
- Ethernet and ControlNet communication adapters
- Compatible with Logix controllers and legacy systems such as PLC5 and SLC500
- Studio 5000 Logix Designer software
Replaces / Drop-In Replacement For
The 1794-OB16P directly replaces the original 1794-OB16 in most applications. Verify compatibility with your system integrator before ordering to ensure firmware and configuration requirements are met.
Works With
- Compatible terminal bases for this module are 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK
- FLEX I/O bus network architecture
- Distributed I/O communication protocols
- Studio 5000 project configuration and monitoring
