SIEMENS 6ES5700-3LA12 Plc Modules

( Brand: Siemens ), ( Manufacturer Part Number: 6ES5700-3LA12 ), ( Part Type: Module )

Review SIEMENS 6es57003la12 Used

The **Siemens 6ES5700-3LA12** is a high-performance, modular **S7-300 CPU 312-2DP** industrial programmable logic controller (PLC) designed for demanding automation applications in manufacturing, process control, and industrial environments. This robust controller is part of Siemens proven S7-300 series, renowned for its reliability, scalability, and seamless integration with other automation systems. The **6ES5700-3LA12** features a **312-2DP** processing unit, which combines a **240 MHz processor** with **2 MB of user memory** (expandable via optional memory extensions) and **2 digital inputs (24 V DC)** integrated directly into the CPU module. This compact yet powerful unit is ideal for applications requiring real-time control, data processing, and communication with peripheral devices, such as sensors, actuators, and human-machine interfaces (HMIs).

Engineered for durability, the **6ES5700-3LA12** operates within a temperature range of **-10 C to 60 C**, making it suitable for harsh industrial settings where temperature fluctuations and mechanical stress are common. Its **compact DIN-rail mounting design** allows for efficient space utilization in control panels, while its **modular architecture** enables easy expansion through the addition of **S7-300 signal modules, communication processors, or memory extensions**. The CPU supports a wide range of **Siemens communication protocols**, including **PROFIBUS DP, MPI (Multi-Point Interface), and Ethernet (via optional CP modules)**, ensuring seamless connectivity with other PLCs, SCADA systems, and enterprise networks.

One of the standout features of the **6ES5700-3LA12** is its **high-speed processing capabilities**, which enable it to handle complex control algorithms, motion control tasks, and real-time data acquisition with precision. The integrated **2 digital inputs** provide immediate feedback for basic control signals, while the **24 V DC power supply compatibility** ensures compatibility with a broad range of industrial sensors and relays. Additionally, the CPU supports **Siemens STEP 7 programming environment**, a user-friendly software suite that simplifies the development, debugging, and maintenance of automation programs. This integration with **TIA Portal** (Totally Integrated Automation) further enhances productivity by allowing engineers to design, simulate, and deploy control logic efficiently.

The **6ES5700-3LA12** is also designed with **safety and redundancy in mind**, offering options for **fail-safe configurations** and **redundant communication links** to minimize downtime in critical applications. Its **long-term availability** and **proven reliability** make it a trusted choice for industries where uptime and performance are non-negotiable. Whether deployed in **discrete manufacturing, packaging lines, or process automation**, this PLC delivers consistent performance, making it a cornerstone of modern industrial automation systems. With its balance of **processing power, expandability, and industrial robustness**, the **Siemens 6ES5700-3LA12 (312-2DP)** remains a versatile and dependable solution for engineers and technicians seeking a high-performance PLC for their automation challenges.

### **Analysis of Siemens 6ES5700-3LA12 (S7-300 CPU 314-2DP) Pros and Cons**

The **Siemens 6ES5700-3LA12** is a **CPU 314-2DP** module from the **S7-300** series, commonly used in industrial automation for PLC (Programmable Logic Controller) applications. Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.

---

### **Pros**

1. **Reliability and Proven Track Record**

- The S7-300 series, including the CPU 314-2DP, has been widely used in industrial environments for decades. Siemens robust engineering ensures high reliability in harsh conditions, making it suitable for manufacturing, process control, and automation tasks.

- The module is designed for **24V DC power supply**, which is common in industrial settings, reducing compatibility issues.

2. **Sufficient Processing Power for Small to Medium Applications**

- The **CPU 314-2DP** features **2 digital inputs, 2 digital outputs, and 2 analog inputs (12-bit resolution)**. While not as powerful as newer CPUs (e.g., S7-1200 or S7-1500), it is adequate for **basic control logic, motor control, and simple process automation** in small to medium-sized systems.

- Supports **16 KB user program memory**, which is sufficient for most small-scale applications.

3. **Compatibility with Existing S7-300 Systems**

- If you already have an **S7-300 network (PROFIBUS DP, MPI, or ET200M)**, this CPU integrates seamlessly without requiring major infrastructure changes.

- Works with **TIA Portal (Siemens engineering software)** and **STEP 7** for programming and diagnostics.

4. **Cost-Effective for Legacy or Budget-Conscious Projects**

- Compared to newer Siemens CPUs (e.g., S7-1200 or S7-1500), the **CPU 314-2DP is relatively inexpensive**, making it a cost-effective choice for **retrofits, small machines, or applications where high-speed processing is unnecessary**.

- Easily available in the **used/refurbished market**, further reducing costs.

5. **Analog and Digital I/O Capabilities**

- The **2 analog inputs (0-10V or 4-20mA)** allow for **sensor interfacing (temperature, pressure, flow, etc.)**, expanding its applicability beyond pure digital control.

- The **2 digital outputs** can drive relays, solenoids, or other actuators.

6. **PROFIBUS DP Support (Optional)**

- While the base model uses **MPI (Multipoint Interface)**, it can be upgraded to **PROFIBUS DP** via additional modules (e.g., **6ES7 391-1AH00-0XB0**), enabling faster communication with higher-end devices.

7. **Easy Troubleshooting and Maintenance**

- Siemens provides **detailed documentation, error codes, and diagnostic tools** in TIA Portal, simplifying troubleshooting.

- The **LED indicators** on the CPU provide quick status checks (e.g., power, run, fault).

---

### **Cons**

1. **Limited Processing Power and Memory**

- The **CPU 314-2DP is outdated by modern standards** and lacks the **speed and memory** of newer CPUs (e.g., S7-1200 with 16 KB user memory vs. S7-1500 with 512 KB ).

- **No integrated Ethernet port** (unlike S7-1200/1500), requiring additional modules (e.g., **CP342-1 or CP1613**) for Ethernet communication, increasing complexity and cost.

- **Slower scan times** compared to modern CPUs, which may be a bottleneck in **high-speed control applications**.

2. **No Built-in Safety Functions**

- Unlike newer Siemens CPUs (e.g., **S7-1500 with SIS capabilities**), the **CPU 314-2DP does not support safety-related control (SIL 2/3)** out of the box. Safety functions require **additional safety modules (e.g., S7-300 with S7 Safety Controller)**, adding cost and complexity.

3. **Limited Expansion Options**

- The **CPU 314-2DP supports only 16 slots** in the rack, but **expansion is limited** compared to newer systems. For larger applications, additional **ET200M or S7-400** modules may be needed.

- **No integrated real-time clock (RTC)** in the base model (requires an additional module like **6ES7 391-1AH00-0XB0**).

4. **Deprecated Software Support**

- Siemens has **phased out full support for S7-300** in favor of newer architectures (S7-1200, S7-1500, SIMATIC PCS 7). While **TIA Portal still supports it**, future software updates may be limited.

- **No native support for modern communication protocols** (e.g., OPC UA, MQTT) without additional modules.

5. **Physical Size and Rack Requirements**

- The **CPU 314-2DP requires a full-size S7-300 rack (19" rack)**, which may be **bulkier and less flexible** than compact PLCs (e.g., S7-1200).

- **No compact or DIN-rail versions** available, making installation in space-constrained environments more challenging.

6. **Higher Long-Term Maintenance Risks**

- As Siemens shifts focus to newer technologies, **parts and technical support may become harder to find** over time.

- **Compatibility issues with modern HMI/SCADA systems** may arise if using legacy software.

7. **No Built-in Web Server or Cloud Connectivity**

- Unlike modern PLCs (e.g., S7-1500 with **SIMATIC NET**), the **CPU 314-2DP lacks built-in web server or cloud integration**, requiring additional hardware (e.g., **CP1613 for Ethernet**) and software for remote monitoring.

---

### **Conclusion**

- **Budget is a concern** (cost-effective for basic control).

- **Existing S7-300 infrastructure is already in place** (no need for migration).

- **High-speed processing or advanced safety functions are not required**.

- **Analog and digital I/O needs are minimal** (2 each for inputs/outputs).

- **High-speed control, motion control, or complex process automation** (where newer CPUs like S7-1200 or S7-1500 would be better).

- **Applications requiring safety certification (SIL 2/3)** without additional modules.

- **Modern industrial environments needing Ethernet, OPC UA, or cloud connectivity**.

- **Long-term projects where future-proofing is critical** (due to limited Siemens support).

---

### **Recommendation**

- You are **retrofitting an existing S7-300 system** and need a cost-effective CPU.

- Your application is **simple (motor control, basic sequencing, analog sensor monitoring)**.

- You **cannot afford or justify upgrading** to a newer PLC (e.g., S7-1200 or S7-1500).

- You **prioritize reliability over advanced features** and have a **support plan** for potential obsolescence.

- You need **high-speed processing, motion control, or advanced communication (Ethernet, OPC UA)**.

- Your project requires **safety-certified control (SIL 2/3)**.

- You are **starting a new project** and can invest in a **modern PLC (S7-1200 or S7-1500)** for better scalability and future compatibility.

- You anticipate **long-term use beyond 10-15 years**, as Siemens may discontinue full support.

- **Siemens S7-1200 (e.g., 6ES7 212-1BE23-0XB0)** More compact, Ethernet-native, better programming tools, but less analog I/O.

- **Siemens S7-1500 (e.g., 6ES7 512-1BE23-0XB0)** High-performance, safety-certified, cloud-ready, but more expensive.

- **Allen-Bradley Micro800 or CompactLogix** If considering non-Siemens options for modern features.

- **

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. Sells new and surplus product develops channels to purchase such. Call to use a shipping service other than the ones listed.

part #: 6es57003la12 prices

• $107.00-$872.02

specifications sensoindustria:

• brand: Siemens
• mpn: 6es5700-3la12
• part type: Module

seller sensoindustria:

• rating: 99.5%
• # reviews: 191365
• city: 1 Millennium Dr, Willingboro, NJ 08046

payments sensoindustria:

• credit card: Mastercard
• wallet: Google-pay
• other

shipping sensoindustria:

• service: Standard
• cost: $12.90
• class: Standard
• transit: 22-34 Days
• type: Fixed

general sensoindustria:

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

returns sensoindustria:

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

offer sensoindustria:

• options: Ship-to-home
• quantity: 1
• started: February 22, 2026
• availability: In Stock
• sold: 0

Siemens 6ES5700-3LA12 Is Similar To:

• 222-1bf22-0xa0 Siemens Used Output Module Make Offer (25.8% similar) All technical questions problems should be addressed through messages for the fastest possible service. Any damaged package received should be addressed with the delivering USPS office and a claim filed there. This lot consists of: 1 used Siemens 6ES7 222-1BF22-0XA0 output module no box condition: ...(March 7th, 2019)
• 3rk1304-0hs00-7aa0 Siemens Isolator Module Used (40.9% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(February 17th, 2018)
• 3tf4422-0b Unbranded Siemens Used (32.4% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(June 15th, 2017)
• 462008.7604.01 Siemens Drive Circuit Board Used Free Shipping (33.3% similar) The shipping on this item reflects standard ground for us. 01 drive circuit board - used for sale. Greenback stock G29329...(July 2nd, 2018)
• 500-5016 Siemens Ti Two Channel Analog Output Module Used (32.7% similar) For sale is a ti Siemens two channel analog output module - used no wiring terminals...(July 21st, 2018)
• 505-6308 Siemens Input Module Used (40% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(January 21st, 2018)
• 505-6516 Siemens Slot Plc Chasis Rack Used (41% similar) Siemens 16 slot plc chassis rack model: 505-6516ITEM from surplus inventory...(August 1st, 2018)
• 545-1106 Siemens Texas Instruments Plc Module Cpu Used (35.8% similar) ...(September 8th, 2018)
• 6es7-222-1ef22-0xa0 Siemens Used Output Module (27.6% similar) For sale is a used Siemens 6ES7-222-1EF22-0XA0 output module...(July 16th, 2018)
• 6es7-235-0kd00-0xa0 Siemens Used Analog I-o (28.6% similar) Please e-mail with any questions. This item is guaranteed to be as described. Left right side e-stand, please specify which one you are interested. Siemens 6ES7-235-0KD00-0XA0 used analog I o module 235-0KD00-0XA0 note: 2 units available...(February 24th, 2018)
• 6es7-235-0kd22-0xa0 Siemens Used Analog I-o (28.6% similar) This item is guaranteed to be as described. Please e-mail with any questions...(February 17th, 2018)