The 1794-OB16 digital DC output module drives 16 sourcing channels at a nominal 24VDC. Each channel supports a maximum on‑state current of 500mA, giving a total output rating of 8A. The module operates reliably between 0 and 55 °C and withstands 30g shock plus 5g vibration at 10‑500 Hz.
Expert Technical Evaluation & Performance Review
Hardware Design and Output Characteristics
This module provides 16 current‑sourcing outputs with an on‑state voltage range of 10 to 31.2VDC. The maximum on‑state voltage drop stays below 0.5VDC, while off‑state leakage current remains under 0.5mA. Engineers rely on these tight tolerances for precise actuator control in distributed I/O applications.
Transient Performance and Signal Timing
The 1794-OB16 handles surge currents of 2A for 50 milliseconds, repeatable every two seconds. Signal delays measure 0.5ms from off‑to‑on and 1.0ms from on‑to‑off. This fast response suits high‑speed sequencing and machine interlock logic.
Environmental Endurance and Certifications
Operating temperature spans 0 to 55 °C, with storage from -40 to 85 °C. The module holds multiple global approvals: c‑UL‑us, CSA, CE, Ex, TÜV, KC, EAC, and RCM. These certifications simplify compliance for installations in North America, Europe, and Asia.
Power Management and Thermal Dissipation
The FlexBus draws 80mA at 5VDC, leading to a maximum power dissipation of 5.3W at 31.2VDC. Thermal dissipation reaches 18.1 BTU/hr. Engineers should install external fusing (recommended SAN‑O MQ4‑800mA) because the module lacks internal fuses.
Compatibility and Mounting Details
The 1794-OB16 works with terminal base units 1794‑TB2, 1794‑TB3, 1794‑TB3S, 1794‑TB3K, and 1794‑TB3SK. Keyswitch position 2 prevents misinsertion. The open‑type enclosure mounts on a DIN rail, and the module weighs only 78g. Use any 1794 Flex I/O adapter for distributed topologies.
