Purchase now 1794-IC16 to expand your high-voltage DC monitoring capabilities with industrial-grade reliability. The Allen-Bradley 1794-IC16 is a high-density digital input module for the Flex I/O platform, providing 16 current-sinking input points specifically rated for 48V DC nominal systems. This module is essential for specialized power distribution and telecommunications applications where standard 24V DC logic is insufficient. By utilizing this genuine OEM module, you ensure a deterministic data stream from field-side devices such as limit switches, proximity sensors, and pushbuttons to your ControlLogix or CompactLogix controllers via a Flex I/O adapter. The 1794-IC16 features 500V AC galvanic isolation, ensuring that electrical noise or high-voltage transients in the field do not reach the sensitive internal backplane logic of the PLC system.
What Is the 1794-IC16?
The 1794-IC16 is a discrete input interface designed to mount on a 1794 terminal base. It serves as the primary bridge for signals operating in the 30V DC to 60V DC range. Each channel is optically isolated and features an individual logic-side LED for immediate troubleshooting. The «sinking» nature of the module means it provides the ground path for sourcing (PNP) field devices. One of its standout architectural features is the support for «Removal and Insertion Under Power» (RIUP), allowing maintenance personnel to hot-swap modules without halting the entire network or powering down the rack, which is a critical requirement for high-availability manufacturing and processing lines.
Key Technical Specifications
- Part Number: 1794-IC16
- Manufacturer: Allen-Bradley / Rockwell Automation
- Number of Inputs: 16 Sinking Inputs
- Voltage Category: 48V DC nominal
- Operating Voltage Range: 30V DC to 60V DC
- On-State Current: 2.0 mA minimum
- Off-State Current: 1.5 mA maximum
- Isolation Voltage: 500V AC between field and logic
- Flexbus Current: 30 mA maximum
- Power Dissipation: 4.7W maximum at 60V DC
Architecture and System Integration
The 1794-IC16 is fully compatible with all 1794 Flex I/O adapters, including EtherNet/IP (1794-AENT), ControlNet (1794-ACN15), and Remote I/O (1794-ASB). In a typical configuration, the 1794-IC16 occupies one slot on the DIN rail and is keyed to a terminal base such as the 1794-TBN or 1794-TB3. Its high-density 16-point layout provides a high concentration of monitoring points in a compact 70mm footprint, significantly reducing the size requirements for local control panels in distributed I/O architectures.
Maintenance Tips
For long-term reliability of the 1794-IC16, it is critical to monitor the ambient temperature within the control cabinet. Operating a fully populated 16-point 48V module at the upper limit of its voltage range (60V) can generate significant heat. An expert maintenance tip is to ensure at least 2 inches of clearance above the module for convective cooling. Additionally, periodically check the BNC or Ethernet connectors on the master adapter; high vibration can cause microscopic communication drops that the 1794-IC16 will register as a backplane fault. Always use ferrules on the 48V field wiring to prevent stray strands from causing a high-voltage short circuit across the terminal base pins.
Frequently Asked Questions
Q: Can I use the 1794-IC16 with a 24V DC power supply?
A: No. The 1794-IC16 has a minimum «On-State» voltage of 30V DC. If you use a 24V supply, the inputs will not trigger consistently, and the module will not accurately reflect the state of the field sensors.
Q: Is the 1794-IC16 compatible with NPN sensors?
A: No. Since the module is a sinking input, it requires sourcing (PNP) sensors. If your system relies on NPN sensors, you would need an IV-series sourcing input module.
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