Purchase now 1794-IB16XOB16P to maximize the efficiency and reliability of your distributed I/O architecture. The Allen-Bradley 1794-IB16XOB16P is a high-density digital combination module for the Flex I/O system, featuring 16 current-sinking inputs and 16 current-sourcing protected outputs. This module is specifically engineered to provide a compact, single-slot solution for applications requiring both signal acquisition and actuator control. The «P» designation indicates that the output channels are equipped with integrated electronic short-circuit protection, safeguarding the module and field wiring from overcurrent conditions. By consolidating 32 points of I/O into a single module, automation engineers can significantly reduce the footprint of control cabinets while maintaining the high-speed, deterministic performance required for complex manufacturing environments like automotive assembly and food processing.
What Is the 1794-IB16XOB16P?
The 1794-IB16XOB16P is a 32-point digital combination module that interfaces with 24V DC field devices. It mounts directly onto a terminal base (such as the 1794-TB32 or 1794-TB32S), which provides the physical connection points for the field wiring and the Flexbus backplane. The input section handles signals from proximity sensors, limit switches, and pushbuttons, while the sourcing output section drives solenoids, relay coils, and indicators. A key feature of this module is its ability to report fault conditions back to the controller, allowing for proactive maintenance and rapid troubleshooting. The module is optically isolated to prevent voltage transients on the field side from damaging the sensitive logic circuitry of the PLC adapter.
Key Technical Specifications
- Part Number: 1794-IB16XOB16P
- Manufacturer: Allen-Bradley / Rockwell Automation
- Number of Inputs: 16 Sinking Inputs (1 group of 16)
- Number of Outputs: 16 Sourcing Outputs (1 group of 16)
- Voltage Category: 24V DC nominal
- Operating Voltage Range: 10V DC to 31.2V DC
- Output Current Rating: 0.5A per channel (8.0A per module maximum)
- Protection Type: Electronic short-circuit protection (outputs)
- Isolation Voltage: 50V (continuous) between field and logic
- Flexbus Current: 70 mA maximum
Output Protection and Diagnostic Capabilities
The electronic short-circuit protection on the 1794-IB16XOB16P is a critical safety feature. If an output channel detects a current draw exceeding its rated limit, the module automatically shuts down that specific channel to prevent thermal damage to the internal transistors. The status is then communicated to the PLC processor, which can trigger an alarm on the HMI. This «per-point» protection ensures that a single wiring fault does not disable the entire 16-output group, allowing the rest of the process to continue if safe to do so. This makes it an ideal choice for high-availability systems where uptime is paramount.
Maintenance Tips
For long-term reliability of the 1794-IB16XOB16P, maintenance teams should periodically verify the integrity of the 24V DC field power supply. Voltage dips below 10V can cause intermittent input signal loss, while spikes above 31.2V can trigger the output protection prematurely. An expert tip: when a short-circuit fault is reported, always inspect the field device and the connector pins for moisture or carbon buildup before resetting the fault. Although the module is protected, repeated short-circuit events can eventually stress the switching components. Always ensure the terminal base screws are torqued to the manufacturer’s specification to prevent arcing and localized heating at high current loads.
Frequently Asked Questions
Q: Does the 1794-IB16XOB16P require a specific terminal base?
A: Yes, due to the high density of 32 points, it requires a 32-point terminal base such as the 1794-TB32 or 1794-TB32S to provide enough termination points for all I/O channels and commons.
Q: Can I use the outputs to drive AC loads?
A: No. The 1794-IB16XOB16P is strictly a DC module. Attempting to switch AC power will cause immediate failure of the output transistors. For AC loads, use an interposing relay or an AC-rated output module.
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