1746-NI16I | Allen Bradley SLC 500 16-Channel Isolated Analog Input Module

Product Overview

The Allen Bradley 1746-NI16I acts as a high-density analog acquisition interface for the SLC 500 controller platform. This 100% brand new original module provides sixteen isolated input channels, allowing the system to monitor a vast array of current-based field sensors simultaneously. It utilizes advanced Sigma-Delta conversion to ensure high-resolution data processing, making it a critical component for complex process control and data acquisition tasks in industrial environments.

Technical Specifications

• Manufacturer: Allen Bradley

• Product Line: SLC 500

• Module Type: High-Density Analog Input

• Number of Inputs: 16 Channels

• Signal Types: 0 to 20 mA, 4 to 20 mA, ±20 mA, 0 to 1 mA

• Conversion Type: Sigma-Delta

• Backplane Current: 125 mA @ 5V DC; 75 mA @ 24V DC

• Isolation: 500V AC for 1 second

• Bandwidth: 6 to 250 Hz

• Step Response: 9 to 630 ms

• Thermal Dissipation: 2.43 Watts

• Programmable Filter Frequencies: 6 Hz, 10 Hz, 20 Hz, 40 Hz, 60 Hz, 80 Hz, 100 Hz, 250 Hz

• Recommended Cable: Belden #8761 (Shielded)

Engineering Advantages

• Superior Noise Rejection: The integrated low-pass digital filter allows engineers to program specific filter frequencies (6 Hz to 250 Hz). This capability effectively eliminates electrical noise and 50/60 Hz interference, ensuring stable readings from sensors located in high-EMI areas.

• High-Density Monitoring: Providing 16 channels in a single slot maximizes the I/O capacity of the SLC 500 chassis. This design reduces the total number of chassis required for large-scale operations and significantly lowers the cost-per-point for analog sensing.

• Enhanced System Protection: The 500V AC isolation protects the backplane and the processor from field-side voltage spikes and transients. This hardware-level separation prevents catastrophic failure of the central controller during field-side electrical faults.

• Real-Time Diagnostics: Five green LED indicators provide instant visual feedback. One LED monitors general module status, while the remaining four manage groups of four channels, allowing technicians to identify signal loss or hardware issues at a glance without a PC.

FAQs

• Is this 1746-NI16I module a brand new original product?

  Yes, we supply only 100% brand new and original Allen Bradley hardware in factory-sealed packaging to ensure long-term field reliability.

• Which SLC 500 slots support this module?

  You can install the 1746-NI16I into any available I/O module slot within an SLC 500 chassis, except for slot 0, which is reserved for the processor.

• Does this module support voltage signals?

  No, the 1746-NI16I specifically handles current signals such as 4-20 mA or ±20 mA. If your application requires voltage inputs, you must select a different module in the 1746 series.

• How do I ensure signal integrity over long distances?

  We recommend using Belden #8761 shielded twisted-pair cable or an equivalent to connect your sensors. Proper shielding and grounding of this cable minimize interference over extended runs.