Choosing Between Siemens and Delta PLCs: A Detailed Comparison

Key Takeaways: Comparing Siemens and Delta PLCs

FeatureSiemens PLCsDelta PLCs
Market PresenceGlobal leader with extensive history in automationStrong presence, especially in Asia and emerging markets
Model VarietiesDiverse range including S7-1500, S7-300Focus on cost-effective solutions suitable for SMEs
Technical SpecificationsHigh processing speeds, extensive I/O capabilitiesCompetitive processing capabilities with simpler I/O options
User InterfaceAdvanced, customizable, suitable for complex projectsUser-friendly, easier for basic operations
CostGenerally higher, with comprehensive support servicesMore budget-friendly, with cost-effective maintenance
InstallationComplex, requiring specific configurationsEasier installation and maintenance
Main ApplicationsLarge-scale industrial and engineering projectsSmall to medium automation projects


Programmable Logic Controllers (PLCs) are fundamental to modern industrial automation. They manage and monitor machinery and processes, ensuring efficiency and precision. Siemens and Delta, two prominent names in the PLC market, offer solutions that cater to different industrial needs. This article, brought to you by ControlNexus, a leading provider since 2013, explores the differences between Siemens and Delta PLCs to assist you in choosing the right solution for your requirements.

Understanding PLCs

A PLC is an industrial digital computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis. PLCs are critical in automation because they provide the brainpower needed to perform precise and repetitive tasks.

Overview of Siemens PLCs

Siemens is a stalwart in the automation industry, known for its robust and versatile PLC solutions. The company offers a range of models:

  • S7-200: Compact, perfect for simple automation tasks.
  • S7-1200: Versatile, with integrated web server and high performance.
  • S7-300/400: Suitable for more complex applications with varied expansion modules.
  • S7-1500: The flagship series with superior capabilities and Profinet integration.

These PLCs are designed to cater to large-scale and complex engineering projects, offering features like built-in safety, advanced communication protocols, and high scalability.

Overview of Delta PLCs

Delta Electronics emphasizes cost-effectiveness and accessibility, making its PLCs ideal for small to medium-sized enterprises (SMEs). The models are known for their ease of use and maintenance, providing a competitive edge for businesses that need reliable automation without extensive customization. Delta PLCs are widely recognized for their efficiency in simple to moderate applications, such as material handling and HVAC systems.

Technical Comparison

When comparing the technical aspects, Siemens PLCs generally offer higher processing power and more sophisticated network capabilities, which are essential for larger and more complex installations. In contrast, Delta PLCs provide sufficient performance for most standard applications, with an emphasis on user-friendliness and lower costs.

Real-World Applications and User Feedback

Siemens PLCs

Siemens PLCs are renowned for their robust performance in demanding industrial environments. They are a staple in automotive manufacturing, where precision and reliability are paramount. For instance, the S7-1500 series is often used in complex automation systems requiring high-speed processing and intricate logic controls. Users often praise Siemens for its scalability and the ability to integrate with a wide range of industrial software and hardware, enhancing overall system productivity.

  • Case Study Highlight: A leading automotive manufacturer implemented Siemens S7-400 PLCs to streamline their assembly line, resulting in a 20% increase in production efficiency and significant reductions in downtime.

Delta PLCs

Delta PLCs, while more budget-friendly, are highly effective in simpler applications like textile machinery or packaging lines. These PLCs are favored for their ease of setup and reliability in repetitive tasks. Small to medium enterprises often report that Delta PLCs are cost-effective solutions that meet their automation needs without unnecessary complexity.

  • User Testimonial: A small textile company utilized Delta DVP Series PLCs to automate their dyeing machines, achieving more consistent product quality and a 30% reduction in manual labor.

Cost Analysis

The cost of a PLC system is not only about the initial purchase price but also includes installation, maintenance, and the potential for future upgrades.

Siemens PLCs

Siemens PLCs generally have a higher upfront cost, attributed to their advanced features and capabilities. However, the total cost of ownership can be lower for large enterprises due to the durability and extensive support offered, including 24/7 technical assistance and regular software updates.

  • Support and Maintenance: Siemens provides comprehensive support packages, which, while initially more costly, offer savings in the long term through efficient problem resolution and minimized downtime.

Delta PLCs

Delta PLCs offer a more affordable initial investment, which is attractive for companies with limited automation budgets. The maintenance costs are also lower, making them suitable for businesses that need straightforward automation without the bells and whistles.

  • Economical Choice: For many small to medium projects, Delta PLCs provide a balance between functionality and cost, often requiring less technical support and offering easier troubleshooting processes.


The choice between Siemens and Delta PLCs should be guided by the specific needs of your project. Siemens is ideal for large-scale industrial applications where complexity and scalability are necessary. In contrast, Delta offers cost-effective solutions perfect for smaller projects with less demanding requirements.

For further guidance tailored to your specific industrial automation needs, consider consulting with our experts at ControlNexus. Explore our range of Siemens and Delta PLCs at ControlNexus Products to find the perfect match for your automation challenges.


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