Product Summary
The 1794-OB16P Flex I/O module energizes field devices like solenoids and relay coils. Its sixteen 24VDC sourcing outputs deliver up to 500mA per channel. Electronic fusing protects each output from overcurrent faults, enhancing system reliability. This module works with Logix and legacy controllers.
Product Procurement & Buyer Guide
Selecting the Right Output Module
The 1794-OB16P drives 24VDC loads with a maximum current of 8 Amps per module. Each channel delivers between 1 mA and 500 mA for precise control. This module needs an external DC supply from 10 to 31.2 Volts. The supply current requirement ranges from 25 to 75 mA. Always verify your power budget against these values. The module dissipates a maximum power of 5.0 W at 31.2 Volts DC. This thermal output equals 17.0 BTU/hr which requires adequate cabinet ventilation. The FlexBus draws 60 mA at 5V DC from the backplane. Account for this draw when sizing your power supply.
Compatibility and Installation Needs
This module requires a compatible terminal base for DIN rail mounting. Use bases like the 1794-TB2 or 1794-TB3 for secure connections. The module uses screw clamp terminations for robust field wiring. It communicates via adapters for ControlNet, DeviceNet, PROFIBUS, and EtherNet/IP. This flexibility allows integration into diverse network architectures. You can mix this module with any Flex I/O type for distributed control. It works seamlessly with ControlLogix, CompactLogix, PLC5, and SLC500 controllers.
Expert Technical Evaluation & Performance Review
Switching Speed and Protection
The 1794-OB16P offers a fast OFF to ON output delay of only 0.5 milliseconds. Its ON to OFF delay is slightly slower at 1.0 milliseconds. These speeds suit applications needing rapid actuator response. The module provides electronic fusing on every output channel. This feature eliminates the need for external fuses for each point. Each channel can handle a surge current of 2 Amps for 50 milliseconds. This surge is repeatable every 2 seconds for demanding loads. The maximum off-state leakage current is just 0.5 mA. This low leakage prevents false activation of sensitive loads.
Environmental and Physical Tolerances
This module operates reliably in temperatures from 0 to 55 degrees Celsius. It can be stored safely in environments from -40 to 85 degrees Celsius. The non-condensing relative humidity range is 5 to 95 percent. This tolerance ensures operation in damp conditions without condensation. The module withstands 5g vibration at 10 to 500 Hertz during operation. It also survives operating shock of 30g for industrial robustness. The ON-state voltage drop across the output is a maximum of 0.5 Volts DC. This low drop minimizes power loss and heat generation in your cabinet.
