HEIDENHAIN LS679 Linear Scale U25531 G2U

( Brand: Heidenhain ), ( Manufacturer Part Number: LS679 ), ( Part Type: Linear Scale )

Review HEIDENHAIN Linear Scale G2u

The **Heidenhain LS679 U25531 Linear Scale with G2U Interface** is a high-precision, industrial-grade measurement solution designed for demanding applications in machine tooling, robotics, and automated manufacturing systems. Engineered to deliver unmatched accuracy and reliability, this incremental linear scale operates on the principle of magnetic field modulation, producing a robust and interference-resistant signal ideal for harsh environments. With a measurement range of up to **25 meters** (depending on configuration), the LS679 excels in long-stroke applications where traditional optical or mechanical scales may fall short due to alignment or environmental challenges. Its **U25531** designation indicates a **25 mm** scale length, which, when paired with the **G2U** interface module, facilitates seamless integration with CNC controllers, PLCs, or motion control systems via a **serial (RS422/RS485) or Ethernet/IP** connection, ensuring real-time feedback with minimal latency. The scale s **incremental output** (typically 1 m resolution) is complemented by a **high signal-to-noise ratio**, achieved through Heidenhain s proprietary **magnetic field encoding technology**, which resists contamination, temperature fluctuations, and mechanical stress making it a preferred choice for high-speed machining, coordinate measuring machines (CMMs), and automated assembly lines. The **G2U interface module** not only converts the scale s analog signals into digital data but also supports advanced features such as **multi-turn counting, absolute position encoding (via optional memory), and diagnostic functions**, enhancing system performance and troubleshooting capabilities. Built to withstand industrial conditions, the LS679 features a **durable stainless steel or aluminum housing**, IP67-rated protection against dust and water ingress, and a **wide operating temperature range** (typically -20 C to 60 C), ensuring consistent operation in factories, outdoor installations, or temperature-controlled environments. Whether deployed in **lathe, milling, or grinding machines**, or integrated into **robotics or automated guided vehicles (AGVs)**, this scale provides the precision and durability required for next-generation manufacturing. Its modular design allows for easy retrofitting into existing systems, while its compatibility with **Heidenhain s LNC or LNC2 controllers**, as well as third-party motion systems, ensures flexibility in implementation. For industries where fractional micrometer accuracy is non-negotiable, the **Heidenhain LS679 U25531 with G2U** stands as a benchmark for reliability, offering a perfect blend of cutting-edge technology and industrial ruggedness.

### **Pros and Cons of Buying a Heidenhain LS679 U25531 Linear Scale (G2U)**

#### **Pros**

1. **High Precision and Accuracy**

The Heidenhain LS679 is a high-end linear encoder known for its exceptional measurement accuracy, typically within ** 0.002 mm** over its full scale. This makes it ideal for applications requiring micrometer-level precision, such as CNC machining, semiconductor manufacturing, or metrology.

2. **Durability and Long-Term Reliability**

Heidenhain scales are built with robust construction, featuring corrosion-resistant materials (such as stainless steel or aluminum) and sealed components to withstand harsh environments, including exposure to dust, moisture, and temperature fluctuations. Their lifespan can exceed **20 years** with proper maintenance.

3. **Compatibility with Advanced CNC Systems**

The G2U interface (a variant of Heidenhain s digital output) is widely supported by modern CNC controllers, including **Siemens, Fanuc, Mitsubishi, and others**. It integrates seamlessly with Heidenhain s own **TNC** controllers, ensuring smooth data transmission and minimal signal loss.

4. **High Resolution and Fast Feedback**

The LS679 offers resolutions up to **1 nm** (depending on the configuration), enabling rapid and precise feedback for high-speed machining. This is particularly valuable in applications like **turning, milling, or additive manufacturing** where real-time position control is critical.

5. **Easy Installation and Calibration**

Heidenhain scales are designed for straightforward mounting on machine tools, with clear documentation and tooling provided. The **G2U interface** simplifies wiring and reduces the risk of signal interference compared to older analog systems.

6. **Minimal Maintenance Requirements**

Unlike mechanical encoders with moving parts, the LS679 uses a **laser-based or optical measurement principle**, reducing wear and tear. Regular cleaning and occasional recalibration are usually sufficient to maintain performance.

7. **Industry Standard and Trusted Brand**

Heidenhain is a **German engineering company** with a long-standing reputation for quality in precision measurement. Their scales are widely used in **aerospace, automotive, and medical industries**, where reliability is non-negotiable.

8. **Future-Proofing and Upgradability**

Heidenhain s digital interfaces (like G2U) are backward and forward-compatible with newer CNC systems. Some models support **wireless or digital communication protocols**, making them adaptable to evolving automation trends.

---

#### **Cons**

1. **High Initial Cost**

The LS679 is a **premium product**, and the U25531 variant (likely a specific length or configuration) will cost significantly more than budget-friendly alternatives (e.g., **Renishaw, Heidenhain s lower-end models, or Chinese encoders**). Prices can range from **$2,000 to $10,000 **, depending on length and accessories.

2. **Limited Availability and Lead Times**

As a specialized component, Heidenhain scales may not be stocked by all distributors. Ordering directly from Heidenhain or authorized dealers can result in **longer lead times** (weeks to months), which may disrupt production schedules.

3. **Complexity in Installation and Troubleshooting**

While Heidenhain provides excellent documentation, setting up and troubleshooting the scale may require **specialized knowledge**, particularly with wiring, calibration, and controller integration. Some users may need to hire a technician for proper installation.

4. **Potential for Signal Noise in Noisy Environments**

Although robust, the **G2U interface** can be susceptible to electromagnetic interference (EMI) in environments with strong magnetic fields or poor shielding. Proper grounding and shielding may be necessary to avoid errors.

5. **Replacement Parts and Spare Availability**

While Heidenhain scales are durable, if a component fails (e.g., a connector or cable), finding **OEM replacement parts** can be challenging. Some older models may no longer receive full support, requiring third-party solutions.

6. **Overkill for Low-Precision Applications**

If your application only requires **sub-micron accuracy** (e.g., basic CNC milling or 3D printing), investing in a Heidenhain LS679 may be **unnecessary**. Lower-cost alternatives (e.g., **Renishaw RLE, Heidenhain s LS670 series, or even some Chinese encoders**) may suffice.

7. **Learning Curve for Non-Expert Users**

Operating Heidenhain s software (e.g., **Heidenhain s TNC controllers**) and interpreting error codes requires **training**. Smaller workshops or hobbyists may find the system **overwhelming** compared to plug-and-play alternatives.

---

### **Conclusion and Recommendation**

#### **Who Should Buy the Heidenhain LS679 U25531?**

- You operate in a **high-precision industry** (e.g., aerospace, medical device manufacturing, semiconductor fabrication).

- Your CNC machine requires **sub-micron accuracy** and **long-term reliability**.

- You are working with **Heidenhain or Siemens CNC controllers** and need seamless integration.

- You can **justify the cost** based on improved part quality, reduced scrap, and extended machine tool lifespan.

- Your application involves **high-speed machining** where fast, accurate feedback is critical.

#### **Who Should Avoid It?**

- Your budget is **tight**, and you can achieve similar results with a **lower-cost encoder** (e.g., Renishaw, Heidenhain LS670).

- You lack **technical expertise** in CNC calibration or troubleshooting.

- Your machine operates in a **highly corrosive or extremely dirty environment** where even premium scales may degrade faster.

- You are a **hobbyist or small workshop** with basic machining needs (e.g., woodworking, plastic prototyping).

#### **Final Recommendation**

The **Heidenhain LS679 U25531 is one of the best linear scales available for professional, high-precision applications**. If your workflow demands **uncompromising accuracy, durability, and long-term support**, it is a **worthwhile investment**. However, if you are working within a **tight budget or non-critical applications**, exploring alternatives (such as **Renishaw s RLE series or Heidenhain s LS670**) may provide a **cost-effective balance** without sacrificing too much performance.

For most **industrial CNC users**, the LS679 remains the **gold standard**, but always **compare total cost of ownership** (including installation, training, and potential downtime) before making a decision. If possible, **test the scale in your environment** or consult with a **Heidenhain-certified integrator** to ensure it meets your specific requirements.

Details:

part #: ls679 prices

• $325.00-$491.97

specifications linactuat:

• brand: Heidenhain
• mpn: Ls679
• part type: Linear Scale

shipping linactuat:

• transit: 5-12 Days
• type: Fixed
• class: Standard
• cost: $0.00
• service: USPS Ground Advantage
• carrier: USPS

returns linactuat:

• policy: No Returns

general linactuat:

• Industrial Automation Motion Controls > Rotary Linear Motion > Linear Encoders
• condition: Used

offer linactuat:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: March 6, 2026

payments linactuat:

• credit card: Discover
• wallet: Paypal
• other

seller linactuat:

• city: Bensenville, Illinois
• rating: 96.5%
• # reviews: 43629

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