Description
1746-N1161 A-B SLC 500 16-Channel Analog Input Module
Product Dimensions：
Product Description (Detailed Explanation)
The 1746-NI16I is a non-isolated analog input module that provides 16 differential input channels. It is designed to interface with various field sensors that output current signals (typically 4-20mA).
The module converts these analog current signals into 16-bit digital values that the SLC 500 processor can interpret and use for control logic. Its high-density design is particularly beneficial for systems with limited rack space that still require extensive environmental or process monitoring.
Product Parameters (Technical Specifications)
| Parameter Category | Specification |
| I/O Platform | SLC 500 Series |
| Number of Inputs | 16 Differential Channels |
| Input Type | Current (4–20 mA, 0–20 mA) |
| Resolution | 16-bit (0 to 32,767) |
| Backplane Current (5V) | 125 mA |
| Backplane Current (24V) | 75 mA |
| Step Response | 10 ms to 100 ms (configurable filter) |
| Input Impedance | 250 Ω |
| Accuracy | ±0.1% of Full Scale at $25^\circ C$ |
Product Advantages (Key Benefits)
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High Density: Provides 16 channels in a single slot, significantly reducing the hardware footprint and the number of racks required for large-scale operations.
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Cost Efficiency: Lower cost-per-channel compared to using multiple 4-channel or 8-channel modules.
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High Resolution: The 16-bit resolution ensures precise data acquisition, which is critical for sensitive process variables like pressure or temperature-derived current signals.
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Flexible Filtering: Users can configure the digital filter to strike a balance between noise rejection and response speed based on the specific application needs.
Precautions (Important Notes)
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Non-Isolated Inputs: This module is non-isolated. This means all 16 channels share a common signal ground. Care must be taken to ensure that field devices are either ungrounded or at the same ground potential to avoid ground loops.
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External Power: The module requires both 5V and 24V DC from the SLC backplane. Ensure your power supply (e.g., 1746-P1, P2, or P4) has sufficient capacity for all installed modules.
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Shielding: Use shielded twisted-pair cable for all analog signals. The shield should be grounded at only one end (typically at the PLC rack) to prevent EMI/RFI interference from distorting the readings.
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Heat Dissipation: Due to the high density of 16 channels, ensure the control cabinet has adequate airflow to keep the module within its operating temperature range.
Product Applications (Typical Use Cases)
The 1746-NI16I is used extensively in process-heavy industries:
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Water and Wastewater Treatment: Monitoring multiple flow meters, pH sensors, and tank level transmitters across a large facility.
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Oil & Gas Operations: Gathering data from pressure transducers and temperature transmitters located on wellheads or pipelines.
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Chemical Processing: Real-time monitoring of various chemical feed rates and reaction vessel pressures.
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Building Automation: Interfacing with a large number of environmental sensors for HVAC control in large commercial structures.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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