Where Are the Most Outstanding PLC Professionals Now?

Introduction

In today’s era of automation, PLCs serve as the core brain of industrial automation, playing a crucial role.

In the challenging and opportunity-filled field of PLCs, professionals at different levels possess varying expertise and career paths.

So, where are the most outstanding PLC professionals? Let’s unveil the mystery of the “gods” at each tier.

First Tier: The Creators – Core R&D Teams of PLC Manufacturers

Location: Headquarters or core R&D centers of PLC manufacturers such as Siemens (Germany), Rockwell (USA), Schneider (France), Mitsubishi (Japan), and Inovance (China).

Why are they the best? If we compare PLCs to a kingdom, then the people in this tier are the “gods” who created the physical laws and universal language of this kingdom. They are the source of technology and the rule-makers. Their excellence is reflected in several aspects:

1. The “Heart” and “Skeleton” of Hardware: They design not just application circuits, but the PLC itself. From selecting the CPU chip to designing hardware circuits, power management, high-speed counters, pulse output modules, and ensuring the product operates stably in harsh industrial environments from -40℃ to 70℃, this requires profound knowledge in electronic engineering, embedded systems, chip-level programming, and electromagnetic compatibility. They consider not just the success or failure of a project, but the stability and reliability of thousands of devices worldwide.

2. The “Soul” of Software: The programming software we use, such as STEP 7, TIA Portal, GX Works2, and CodeSys, are their masterpieces. They not only implement the IEC 61131-3 standard (LD, FBD, SFC, ST, IL programming languages) but also design compilers, debuggers, simulators, communication protocol stacks (like Profinet, EtherCAT, Modbus TCP/IP), as well as the entire software architecture and user experience. The code they write is the “meta-code” that generates the final control code.

3. The “Founders” of the Ecosystem: They define the expansion capabilities of PLCs and how to seamlessly integrate with devices such as HMIs (Human-Machine Interfaces), SCADA (Supervisory Control and Data Acquisition), MES (Manufacturing Execution Systems), robots, and frequency converters. They build the foundation of the entire automation ecosystem.

For example: Imagine a software architect from the Siemens TIA Portal team. His job may not be to write a specific control program for a welding robot for an automotive factory, but to design a brand new feature, such as an “AI-based predictive maintenance library.” He needs to consider:

• How to efficiently run a lightweight AI model within the PLC kernel?
• How to design standardized data interfaces and function blocks for this library, allowing engineers worldwide to easily call them?
• How to ensure this new feature does not affect the PLC’s real-time performance and determinism? This kind of creativity from scratch and absolute control over underlying technology is unmatched by any application-level engineer. They stand at the pinnacle of technology.

Second Tier: The Architects – Senior Electrical Engineers in Large Automation Companies

Location: Automation departments of large system integrators, engineering companies (such as MCC, CEEC, and major multinational engineering firms), or large manufacturing industries (such as automotive, aerospace, and semiconductor giants).

Why are they impressive? If the first tier is “gods,” then the second tier is the “representatives of gods on earth,” capable of wielding the tools created by the gods to construct magnificent palaces. Their excellence is reflected in:

1. Grand Project Vision: They are often responsible for “super projects” with investments of hundreds of millions or even billions. For example, a brand new production line for new energy vehicles, an automated container terminal at a large port, or a DCS/PLC control system for a chemical plant. They need to design the entire automation system architecture from a top-down perspective, selecting the most suitable PLC brand, network topology, redundancy solutions, and safety levels.

2. Standardized Program Framework: While one person can write a good program, a group must rely on standards to collaboratively write countless projects. These senior engineers create and maintain a complete set of programming specifications and standard program libraries for the company.

3. For instance, they might define a “motor” function block that not only includes start-stop logic but also integrates fault diagnosis, alarm logging, runtime accumulation, and energy efficiency management. All engineers call this standard block in their projects, ensuring code consistency, readability, and maintainability. This itself is a high level of engineering wisdom.

4. Rich Practical Experience and Troubleshooting Ability: They have undergone countless project debugging “baptisms” and dealt with various bizarre on-site issues. For example, if a production line experiences communication interruptions at specific times, they can quickly determine whether it is a grounding issue, a network storm, or a bug in a device’s protocol stack. This intuition based on vast experience and systematic problem-solving ability is invaluable.

For example: A senior electrical engineer responsible for the body shop at Tesla’s Shanghai factory. His task is not to write a program for a single robot, but to:

• Architectural Design: Decide whether to use thousands of PLCs from Siemens S7-1500 or Rockwell’s ControlLogix? Should the main network use Profinet or EtherNet/IP? How to interface with the upper MES system?
• Standard Setting: He leads the team to write the “Tesla Body Shop PLC Programming Standard,” which specifies everything from variable naming, comment styles, HMI screen templates to safety logic handling.
• Overcoming Challenges: During the debugging phase, he discovers that multiple robots working together exhibit slight timing errors, leading to decreased welding accuracy. He needs to analyze the communication delays of the entire network, the PLC’s scanning cycle, and the robots’ response times, ultimately solving this tricky problem by optimizing task priorities and network configurations in the PLC program.
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Third Tier: The Experts – Technical Elites of PLC Brand Distributors

Location: Technical support departments of authorized distributors or resellers of brands like Siemens, Inovance, and Rockwell.

Why are they skilled? They are the bridge connecting the “gods” (manufacturers) and “mortals” (end users), serving as the “living dictionary” and “technical authority” for specific PLC brands. Their advantages include:

1. Depth and Specialization: They are well-versed in the PLC product lines of the brands they represent. From the performance parameters of the latest models to the usage of obscure instructions, and even bugs in known firmware versions, they can provide detailed insights. Their depth of knowledge on specific brands may even surpass that of many engineers in large companies.

2. Broad Case Experience: Distributors serve clients across various industries in their regions. Today they might help a food factory solve a packaging machine positioning issue, tomorrow assist a water treatment plant in optimizing a PID control, and the day after help an equipment manufacturer debug a specialized device integrated with a vision system. This cross-industry experience gives them a broad perspective and flexible problem-solving capabilities.

3. First-Hand Information Channels: They can directly obtain the latest technical materials, training, and support from manufacturers. When end users encounter an unsolvable problem, distributor engineers are often the first to access the core technical support channels of the manufacturers.

For example: An engineer from a first-tier Siemens distributor, Mr. Wang. A client using an S7-1200 PLC to control a third-party instrument via Modbus RTU experiences unstable data. The client has struggled for a week without success. When Mr. Wang arrives, he does not rush to modify the program but instead:

• Hardware Inspection: He checks the signal quality of the RS485 bus with an oscilloscope and finds that the terminal resistor is not connected, causing signal reflection.
• Protocol Analysis: He connects a Modbus debugging tool to capture communication messages and discovers that the instrument times out under certain conditions.
• Program Optimization: He suggests the client add communication timeout and error retry mechanisms in the PLC program and adjusts the polling interval. Ultimately, the problem is resolved, and Mr. Wang also provides the client with a detailed “Best Practices for Modbus Communication” report. This comprehensive grasp of products, protocols, and on-site issues is the value of distributor engineers.
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Fourth Tier: The Practitioners – Electrical Engineers in Small and Medium-Sized Companies

Location: Small and medium-sized equipment manufacturers, equipment maintenance departments in factories, and small system integrators.

They are the foundation of the industry This is the largest group of PLC engineers, supporting the automation upgrade of China’s manufacturing industry. Their characteristics include:

1. Versatility and Comprehensive Skills: In small and medium-sized companies, an electrical engineer often needs to be “multi-skilled.” They must understand PLC programming, HMI configuration, electrical schematic design (using AutoCAD or EPLAN), frequency converter/servo parameter settings, and even perform wiring and debugging themselves. They are the “jack-of-all-trades” for solving specific problems.

2. Cost and Efficiency Orientation: Their work is often subject to strict cost and deadline constraints. How to quickly meet customer needs with the most mature and reliable technical solutions within a limited budget is a daily challenge. This “down-to-earth” engineering capability is invaluable.

3. Quick Learning and Adaptability: Small and medium-sized companies have diverse projects; they may use Mitsubishi today and Inovance tomorrow. They need to quickly adapt to new brands and products.

For example: An electrical engineer, Mr. Li, from a small non-standard automation company. The client requests the design of an automatic screw locking machine with a limited budget and a one-month deadline. Mr. Li’s workflow is:

• Model Selection: Considering cost and performance, he chooses the domestic brand Inovance PLC and HMI, along with Delta servo motors.
• Design: He uses EPLAN to draw the complete electrical schematic and wiring diagrams.
• Programming and Debugging: He independently completes the PLC logic control, HMI interface design, precise positioning of the servo motor, and timing control of the screw feeder. During this process, he cleverly uses a photoelectric sensor and a timer to achieve effective detection of screw blockage at a low cost. Mr. Li may not understand complex network architectures or participate in standard setting, but he can turn a vague requirement into a stable, value-creating machine. This ability to transform technology into productivity is what the manufacturing industry needs most.
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Fifth Tier: The Guides – PLC Training Instructors

Location: Various vocational training institutions and online education platforms.

They are the “seeders” of the industry Placing them in the fifth tier is not to belittle their technical level, but to position them based on their role in the engineering practice chain. Top PLC training instructors often have rich project experience, and their excellence lies in:

1. Knowledge Refinement and Transformation Ability: They can distill complex and obscure technical knowledge into easy-to-understand, step-by-step course systems. They know where beginners are likely to get stuck and what metaphors and examples can best aid understanding. This ability to “simplify complexity” is itself a high level of skill.

2. Breadth and Forward-Looking Perspective: To attract students, excellent training instructors need to continuously learn about the latest PLC models, programming software, and industry trends (such as Industrial IoT, OPC UA), and incorporate these into their courses to keep the content fresh and competitive.

3. Experience Transmission and Inspiration: They not only teach technology but also share their project experiences and “pits” they have encountered, illuminating a path for beginners to help them avoid detours and quickly get started.

For example: A well-known PLC training instructor, Mr. Zhang. He was once a senior engineer in the second tier and, after retirement, devoted himself to education. His courses are popular because:

• Case-Driven: He does not teach dry instructions but uses real projects like “automatic feeding carts” and “constant pressure water supply systems” as carriers to integrate knowledge points.
• Detailed Analysis: He breaks down the program framework of a large project, explaining to students “why it should be written this way” rather than just “this is how it should be written.”
• Teaching to Fish: He emphasizes programming concepts and troubleshooting methods rather than having students memorize code. He teaches students how to consult manuals, use search engines, and analyze error logs.

Mr. Zhang may no longer participate in frontline projects, but the thousands of students he has trained are shining in the fourth, third, and even second tiers. In this sense, he is an indispensable “guide” in the entire PLC talent ecosystem.

Conclusion: Who is the Truly “Best” PLC Professional? If we consider technical depth, the PLC R&D engineers in the first tier are undoubtedly at the top of the pyramid; if we consider project experience, the engineers from large automation companies in the second tier have more practical advantages; if we consider application flexibility, the distributor engineers in the third tier may excel. Meanwhile, engineers from small and medium-sized companies and training instructors represent a broader group of PLC professionals.We welcome everyone to leave comments and engage in discussions!