1. Sensors Industrial Automation Control For Sale
  2. sku: 22983736633679604
  3. ALLEN BRADLEY 1747-L20D

ALLEN BRADLEY 1747-L20D Costmetic

1747-l20d Allen Bradley / 1747l20d Used Costmetic Damage Works

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1747-L20D ), ( Part Type: Work )

Review ALLEN BRADLEY Used Costmetic Damage Works

The **Allen-Bradley 1747-L20D** is a high-performance, compact industrial controller designed for demanding automation applications where reliability, flexibility, and scalability are paramount. Part of Rockwell Automation s **CompactLogix** series, this model features a **1747-L20D** designation, indicating its specific configuration within the family, which includes a **1747-L20D** cosmetic variant optimized for environments requiring enhanced protection against dust, moisture, and mechanical stress. This controller is engineered to deliver robust control capabilities in manufacturing, process automation, and discrete control systems, offering a seamless integration with other Rockwell Automation products such as **ControlLogix**, **SLC**, and **RSLogix** software platforms.

The **1747-L20D** is housed in a **NEMA 4X-rated enclosure**, providing superior resistance to corrosion, water, and oil, making it ideal for harsh industrial settings such as food and beverage processing, pharmaceutical manufacturing, or outdoor automation systems. Its **compact footprint** allows for efficient panel integration without compromising functionality, while the **dual Ethernet ports** enable high-speed communication for real-time data exchange, supporting protocols like **EtherNet/IP**, **CIP**, and **Modbus TCP** for seamless connectivity with PLCs, HMIs, and enterprise systems. The inclusion of **12 digital I/O points** (expandable via additional modules) provides versatile input/output flexibility, accommodating a wide range of sensors, actuators, and field devices, ensuring adaptability to diverse automation challenges.

At its core, the **1747-L20D** operates on **Rockwell Automation s integrated programming environment**, leveraging **RSLogix 5000** or **Studio 5000** software for intuitive ladder logic, structured text, or function block programming. Its **high-speed processing** and **deterministic timing** capabilities ensure precise control over complex sequences, making it suitable for applications requiring millisecond-level response times. Additionally, the controller supports **remote I/O expansion**, allowing for distributed control architectures that enhance system scalability and reduce wiring complexity. With built-in **diagnostic tools** and **self-monitoring features**, maintenance and troubleshooting are streamlined, reducing downtime and improving operational efficiency.

The **1747-L20D** also excels in energy management and sustainability, offering features such as **power-saving modes** and **low-power operation** to minimize electrical consumption while maintaining peak performance. Its compatibility with **Rockwell s Safety Integration System (SIS)** further enhances its appeal for safety-critical applications, providing integrated safety functions without the need for additional hardware. Whether deployed in a **small-scale automation project** or as part of a larger, integrated control system, the **1747-L20D** delivers a balance of **performance, durability, and ease of use**, making it a cornerstone of modern industrial automation solutions. For engineers and technicians seeking a **reliable, future-proof controller**, the **Allen-Bradley 1747-L20D** stands as a proven choice for driving efficiency and innovation in industrial environments.

**Pros and Cons of Buying a Used Allen-Bradley 1747-L20D (Cosmetic Condition)**

### **Pros:**

1. **Cost Savings** A used or refurbished unit is significantly cheaper than a new one, offering substantial savings without sacrificing core functionality.

2. **Functional Reliability** If the unit is in cosmetic condition (no mechanical or electrical issues), it will perform the same as a new controller for basic PLC operations.

3. **Compatibility** The 1747-L20D is a well-established model with broad industry support, meaning spare parts, documentation, and programming tools remain widely available.

4. **Quick Replacement** For legacy systems where new PLCs may not be immediately available, a used unit provides an immediate solution without requiring system redesign.

5. **Energy Efficiency** Older PLCs like this one consume less power than newer models, which can be beneficial in energy-sensitive applications.

6. **Proven Performance** The 1747 series has a long track record of reliability in industrial environments, making it a trusted choice for many engineers.

### **Cons:**

1. **Limited Warranty** Used units typically come with no or minimal warranty, leaving you responsible for any failures or maintenance costs.

2. **Obsolescence Risks** Allen-Bradley has phased out support for older models, meaning future software updates, driver compatibility, or technical support may be difficult to obtain.

3. **Potential Hidden Issues** Even if the unit is in cosmetic condition, internal wear (e.g., failing capacitors, degraded solder joints, or dust accumulation) could lead to premature failure.

4. **Software Limitations** Older PLCs may not support modern programming environments (e.g., newer versions of Studio 5000 or RSLogix), requiring compatibility checks with your existing system.

5. **No Guarantee on Longevity** Unlike a new unit, a used PLC may not last as long, especially if it has seen heavy usage or improper storage.

6. **Compatibility with New Devices** Some modern I/O modules, HMI interfaces, or communication protocols (e.g., Ethernet/IP with newer firmware) may not work seamlessly with this older model.

### **Conclusion:**

The **Allen-Bradley 1747-L20D in cosmetic condition** is a viable option for applications where cost is a priority and the unit will be used in a stable, well-maintained environment. It is particularly suitable for:

- Legacy systems where replacement is needed but budget is tight.

- Non-critical control applications where reliability is not compromised by age.

- Short-term or temporary deployments.

However, if the PLC will be used in a **long-term, mission-critical, or high-reliability** application, investing in a **new or refurbished unit with warranty support** may be more prudent. Additionally, if software compatibility or future scalability is a concern, a newer PLC model (e.g., 1769 series or Micro800) could be a better long-term investment.

### **Recommendation:** - **Buy the 1747-L20D used** if:

- You have verified it is in **cosmetic condition with no known electrical or mechanical issues**.

- The unit will be used in a **low-risk, short-term, or non-critical** application.

- You are prepared to **test it thoroughly** before full deployment and have spare parts on hand.

- You can **maintain it proactively** (e.g., cleaning, monitoring for overheating).

- **Avoid the 1747-L20D used** if:

- You need **long-term reliability** without risk of obsolescence.

- The application requires **modern communication protocols or software support**.

- Budget allows for a **new or refurbished unit with warranty coverage**.

- You lack the expertise to **diagnose potential hidden failures**.

For best results, **inspect the unit thoroughly** (check for burn marks, loose connections, or signs of electrical stress) and consider **pairing it with a backup or newer I/O modules** to mitigate risks. If possible, consult an Allen-Bradley specialist to confirm compatibility with your existing system.

Details:

Inputs: 12 24 VDC sinking inputs. Power Input: 120 240 VAC. ALLEN BRADLEY 1747-L20D / 1747L20D USED Costmetic Damage Works. Series: SLC 500 Fixed Controller.

part #: 1747l20d prices

  • $198.00-$500.00

specifications sensoindustria:

  • brand: Allen Bradley
  • mpn: 1747-l20d
  • part type: Work

seller sensoindustria:

  • rating: 100.0%
  • city: Edmond, Oklahoma
  • # reviews: 3707

shipping sensoindustria:

  • service: USPS Ground Advantage
  • class: Standard
  • transit: 4-10 Days
  • cost: $14.50
  • carrier: USPS
  • type: Fixed

returns sensoindustria:

  • method: Money back
  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Buyer

general sensoindustria:

  • condition: Used
  • PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules

offer sensoindustria:

  • availability: In Stock
  • sold: 0
  • quantity: 1
  • started: June 5, 2026
  • best offers: True
  • options: Ship-to-home

payments sensoindustria:

  • other
  • wallet: Google-pay
  • credit card: Discover
part type: work,
category: business & industrial > plcs hmis > plc peripheral modules > plc input output modules, sku: 22983736633679604,
Allen Bradley 1747-L20D Is Similar To:
sensoindustria logo
5 offers $198.00–$500.00 USD
  • Used. Offer #1 priced at $198.00 + $14.50 shipping estimate = $212.50* total. Expansion: Supports a 2-slot expansion chassis. Communication: DH-485 serial communications (not Ethernet).+$14.50 shipping
  • Used. Offer #2 priced at $401.21 + $12.90 shipping estimate = $414.11* total. +$12.90 shipping
  • Used. Offer #3 priced at $500.00 + $17.62 shipping estimate = $517.62* total. All screws are tight and look like they never had a screwdriver put to them. Allen-Bradley Series B FRN 4.+$17.62 shipping
  • New – Open box. Offer #4 priced at $649.00 + $14.50 shipping estimate = $663.50* total. B SLC500 Controller Module USA A4077 F8C7 NEW OPEN BOX- ALLEN BRADLEY SER.+$14.50 shipping
  • Used. Offer #5 priced at $494.10 + $84.46 shipping estimate = $578.56* total. purchasing this item. For sale is an Allen Bradley , Series B, Frn 4 Processor Unit.+$84.46 shipping

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