Product Name: Input Module
Brand Name: Allen Bradley
Model Number:1746-NR4
Country of Origin:USA
Warranty: 12 Months
Whatsapp：+86 18159889985
Email：[email protected]
Brand Name: |
Allen Bradley |
Model Number: |
1746-NR4 |
Country of Origin: |
USA |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
Delivery time in stock |
Payment Terms: |
T/T |
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Sales Manager: |
Stella |
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Send an email: |
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The Allen‑Bradley 1746‑NR4 is a four‑channel analog input module purpose‑built for the SLC 500 programmable controller platform. This 1746‑NR4 module interfaces directly with platinum, nickel, copper, and nickel‑iron RTD sensors, as well as resistance‑based devices such as potentiometers up to 3,000Ω. Each channel on the 1746‑NR4 is individually configurable for input type, excitation current (0.5 or 2.0 mA), filter frequency, and data format (°C, °F, or ohms). The 1746‑NR4 delivers on‑board scaling and conversion with 0.1°C resolution, while built‑in broken sensor detection (open/short circuit) and out‑of‑range alerts ensure reliable operation. Powered entirely via the SLC backplane, the 1746‑NR4 requires no external supply, making it a seamless addition to any fixed or modular SLC 500 system.
Direct RTD Interface – Eliminates the need for external signal conditioners by connecting bare RTD probes directly to the SLC 500 system.
High Measurement Precision – Delivers 0.1°C temperature resolution with selectable 10–250 Hz digital filtering for noise rejection in electrically noisy environments.
Flexible Sensor Compatibility – Supports a wide array of RTD types (platinum 385/3916, copper, nickel, nickel‑iron) and direct resistance inputs up to 3,000Ω.
Diagnostic Visibility – Five onboard LEDs (module + four channels) and self‑diagnostic error codes enable rapid fault identification and reduced troubleshooting time.
Simple Installation – Single‑slot SLC 500 form factor with removable terminal block and no external power requirements simplifies cabinet wiring and maintenance.
Hazardous Location Ready – UL/CSA Class I, Division 2 certification allows deployment in petrochemical and other potentially explosive environments.
4 Backplane‑Isolated Input Channels – Each channel independently configurable for RTD or resistance input types.
Selectable Excitation Current – 0.5 mA (for high‑resistance ranges) or 2.0 mA (for low‑resistance RTDs like 10Ω Copper).
Programmable Digital Filtering – Four notch frequencies (10, 50, 60, 250 Hz) provide 50/60 Hz noise rejection and adjustable update times.
On‑Board Scaling & Conversion – Delivers temperature readings in °C or °F, or resistance values in ohms, with user‑selectable engineering units, scaled‑for‑PID, or proportional counts formats.
Broken Sensor Detection – Per‑channel open‑circuit and short‑circuit detection with configurable fault response (zero, upscale, or downscale).
Out‑of‑Range Indication – Flags over‑range and under‑range conditions for each input channel.
Autocalibration – Module automatically recalibrates when a channel is enabled or when input type, filter frequency, or excitation current changes.
Diagnostic LED Indicators – One green LED per channel plus a module status LED for immediate visual health checks.
The 1746‑NR4 is engineered for reliable operation in industrial control environments, with an operating temperature range of 0°C to 60°C and storage capability from –40°C to 85°C. The module tolerates relative humidity from 5% to 95% non‑condensing. It carries UL and CSA certification for Class I, Division 2 hazardous locations (Groups A, B, C, D), making it suitable for petrochemical plants, spray painting areas, and other potentially explosive atmospheres. The module is also CE compliant for applicable EMC directives. Installation is permitted in any SLC 500 I/O chassis slot except slot 0, which is reserved for the processor or adapter. Optical isolation of 500V DC between inputs and chassis ground/backplane provides protection against electrical interference and transient voltages.
Q1: What types of sensors can I connect to the 1746‑NR4?
The 1746‑NR4 supports a broad range of RTD types including platinum (385 and 3916 curves: 100, 200, 500, 1000Ω), copper (426: 10Ω), nickel (618/672: 120Ω), and nickel‑iron (518: 604Ω). It also accepts direct resistance inputs from potentiometers and other variable resistance devices up to 3,000Ω.
Q2: Does the 1746‑NR4 work with 2‑wire, 3‑wire, and 4‑wire RTDs?
Yes. The 1746‑NR4 supports 2‑wire, 3‑wire, and 4‑wire RTD configurations. For highest accuracy, 3‑wire or 4‑wire connections are recommended to compensate for lead wire resistance.
Q3: Can the 1746‑NR4 read a 4‑20 mA temperature transmitter?
No. The 1746‑NR4 is designed to read bare RTD probes directly, not 4‑20 mA loop‑powered transmitters. For 4‑20 mA signals, use analog input modules such as the 1746‑NI4 or 1746‑NIO4 series.
Q4: How is the 1746‑NR4 configured?
Each channel on the 1746‑NR4 is configured via the user’s ladder logic program using the module’s output image table. There are no DIP switches on the module. Configuration parameters include input type, excitation current, filter frequency, temperature units (°C/°F), data format, and broken input response.
Q5: What is the update time of the 1746‑NR4?
The update time depends on the selected filter frequency and the number of enabled channels. With a single channel at 250 Hz filter, the update time is as fast as 17 ms; with four channels at 10 Hz filter, it extends to approximately 1.22 seconds.
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