Order now 1794-IB16 to enhance your plant-floor diagnostics and signal acquisition speed. The Allen-Bradley 1794-IB16 is a high-density 24V DC digital input module designed for the Flex I/O platform, offering 16 current-sinking input points. This module is the industry standard for distributing I/O closer to field devices, significantly reducing wiring costs and complexity. The 1794-IB16 interfaces seamlessly with a wide range of sourcing (PNP) sensors, limit switches, and other discrete devices. Built with industrial-grade optical isolation, it provides a robust barrier between the field-side electrical noise and the internal Flexbus logic. By utilizing this genuine Rockwell Automation component, you ensure a reliable, deterministic data stream to your ControlLogix, CompactLogix, or PLC-5 controllers, maximizing machine uptime and process efficiency.
What Is the 1794-IB16?
The 1794-IB16 is a 16-point digital input module that mounts on a 1794 terminal base. It operates as a current-sinking device, meaning it provides the return path for the current coming from a sourcing field device. Each of the 16 channels features an individual LED indicator for rapid visual troubleshooting on the factory floor. The module is engineered for «Removal and Insertion Under Power» (RIUP), allowing for hot-swapping during active production cycles without disrupting the communication to other modules in the rack. Its low power consumption and high-speed input filtering make it ideal for high-speed material handling, packaging, and assembly line applications where every millisecond of scan time is critical.
Key Technical Specifications
- Part Number: 1794-IB16
- Manufacturer: Allen-Bradley / Rockwell Automation
- Number of Inputs: 16 Sinking Inputs (1 group of 16)
- Nominal Voltage: 24V DC
- On-State Voltage Range: 10V DC to 31.2V DC
- On-State Current: 2.0 mA minimum
- Off-State Current: 1.5 mA maximum
- Input Filter Time: 0.25ms to 8ms (Software configurable)
- Isolation Voltage: 50V (continuous) between field and logic
- Flexbus Current: 30 mA maximum
Compatibility and Terminal Bases
The 1794-IB16 is a universal module within the Flex I/O ecosystem. It is compatible with several terminal bases, including the 1794-TB3, 1794-TB3S, and 1794-TBN. For high-density applications, the 1794-TB3 is preferred as it provides three levels of terminals for simplified common and power distribution. The module configuration is easily handled through Studio 5000 or RSLogix 500, where users can adjust input filter times to eliminate the effects of contact bounce from mechanical switches.
Installation Advice
When installing the 1794-IB16, ensure that the terminal base is securely latched to the DIN rail to maintain a stable backplane connection. An expert tip: when using the 1794-IB16 with long cable runs (exceeding 30 meters), use shielded twisted pair wiring to prevent induced voltages from nearby AC power lines from causing «ghost» inputs. Furthermore, always verify the polarity of your 24V DC field power; although the module is rugged, reversed polarity on the power terminals can prevent the inputs from triggering or potentially damage the diagnostic LEDs over time.
Frequently Asked Questions
Q: Does the 1794-IB16 support NPN (Sinking) sensors?
A: No, because the module itself is a sinking input, it requires sourcing (PNP) sensors. If you have NPN sensors, you would typically need a sourcing input module like the 1794-IV16.
Q: Can I change the input filter time for individual channels?
A: No, the input filter time is generally set for the entire module or in groups, depending on the adapter and software version being used. Standard settings are 0.5ms and 1ms for high-speed requirements.
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