Allen-Bradley vs Siemens: how do the two PLC platforms compare?

Both are leading industrial control platforms. Allen-Bradley, from Rockwell Automation, is dominant in North American manufacturing and uses the Studio 5000 environment; Siemens is strong globally and in process industries and uses TIA Portal. Many plants run both, so the most employable engineers are comfortable in either.

Which PLC platform should I learn first?

Learn the platform your target industry and region use most. In North American discrete manufacturing that is often Allen-Bradley; in process industries and global plants Siemens is common. The control concepts transfer, so a strong foundation in one makes the other easier.

Is it worth knowing both Allen-Bradley and Siemens?

Yes. Knowing both widens the jobs and contracts you qualify for, since plants and integrators rarely standardize on a single vendor. Dual-platform fluency is one of the most valued combinations in controls work.

How do I find Allen-Bradley or Siemens controls jobs?

Automate America is a marketplace where companies post controls and automation jobs, contracts, and RFQs for free and North American professionals apply directly. You can browse the work or post your own profile and review your matches.

Allen Bradley vs Siemens PLC: Which to Learn First

If you are starting a career in industrial automation, this is probably the first real decision you face. Allen-Bradley (made by Rockwell Automation) and Siemens are the two PLC platforms that dominate the global market. Together, they account for over 60% of all PLC installations worldwide.

Siemens holds 37.2% of the global PLC market. They are the world leader when measured across all regions. Siemens dominates in Europe, where their S7 series is the standard in automotive, pharmaceutical, and process industries.

Rockwell Automation (Allen-Bradley) holds 23.1% globally but over 40% of the North American market. In the United States, Allen-Bradley is the default choice for discrete manufacturing, automotive, food and beverage, and packaging.

If you plan to work primarily in North America, Allen-Bradley gives you the widest job pool. If you want to work internationally, Siemens opens more doors. If you learn both, you eliminate geography as a constraint.

The Software: Studio 5000 vs TIA Portal

Studio 5000 is Rockwell's integrated development environment for ControlLogix and CompactLogix processors. It uses a tag-based architecture where every data point gets a descriptive name rather than a memory address.

TIA Portal is Siemens' unified engineering framework for S7-1200, S7-1500, and ET 200SP processors. PLC programming, HMI design, drive configuration, and network setup all happen in one software package.

Programming Philosophy Differences

Allen-Bradley emphasizes flat, tag-driven programs. A typical project has a main routine calling subroutines with descriptive tag names. Most programs are readable by maintenance electricians.

Siemens emphasizes structured, modular programs using Function Blocks (FBs) with instance data blocks. This approach scales better for large projects with repeated equipment but requires more upfront planning.

What Each Platform Does for Your Pay

Pay follows the platform, the region and the depth of your experience:

Allen-Bradley specialists: the widest pool of North American work, strongest in the Midwest.

Siemens specialists: strong in process industries and European-owned plants.

Dual-platform professionals: the hardest to find, and the ones companies compete for.

Industry-Specific Preferences

Allen-Bradley dominant: Automotive manufacturing, food and beverage, packaging, water/wastewater, oil and gas (North America).

Siemens dominant: Pharmaceutical and life sciences, chemical process, European-owned automotive, power generation, metals and mining.

Training and Education Options

Allen-Bradley: Rockwell Automation official courses ($2,000-$4,000 per course). Community colleges in the Midwest feature AB heavily. Automate America lists 130+ schools with automation training.

Siemens: SITRAIN official courses. The Siemens SCE program provides free software licenses to educational institutions. TIA Portal includes built-in simulation (PLCSIM).

The Real Answer: Learn Both, But Start With One

On the Automate America platform, professionals who list both Allen-Bradley and Siemens receive 40% more contract inquiries than those listing only one.

Years 1-3: Master your primary platform. Get certified. Build a portfolio. Years 3-5: Add the second platform through formal training and cross-platform contracts. Year 5+: You are a dual-platform professional. Rate ceiling increases. Geographic flexibility increases.

Learn Allen-Bradley first if you plan to work in North America. Start with Siemens if you are near European-owned facilities. The underlying concepts of industrial control are platform-agnostic.

There are 2.1 million manufacturing jobs projected to go unfilled by 2030, with only 9 candidates per open automation position. Whichever platform you choose, the demand is there.