Step7

Step7
Name	Step7
Developer	Siemens
Released	1995
Latest release	SIMATIC Step7 V5.x / TIA Portal transitions
Programming language	C, C++
Operating system	Microsoft Windows
Genre	Programmable logic controller programming environment
License	Proprietary

Step7

Step7 is a proprietary programmable logic controller (PLC) engineering suite developed by Siemens during the 1990s for the SIMATIC product family. It integrates configuration, programming, diagnostics, and commissioning tools used in industrial automation projects across manufacturing, process, and infrastructure sectors. The package ties together Siemens hardware platforms, fieldbus systems, and higher-level automation components to support system design, deployment, and maintenance.

Overview

Step7 serves as the engineering backbone for Siemens SIMATIC S7-300, SIMATIC S7-400, SIMATIC S7-1200, and SIMATIC S7-1500 PLC families, linking hardware configuration with logic development and diagnostics. The environment coordinates with fieldbus and industrial Ethernet technologies such as PROFIBUS DP, PROFINET, and Industrial Ethernet implementations used in plants like BASF chemical facilities and automotive lines operated by Volkswagen and BMW. Integration points include supervisory control and data acquisition systems such as SIMATIC WinCC and manufacturing execution systems from vendors including SAP and Rockwell Automation interoperable setups. Step7 also interacts with motion control modules from Siemens Motion Control and safety controllers compliant with standards influenced by the International Electrotechnical Commission.

History and Development

Step7 originated in the mid-1990s as Siemens consolidated earlier programming tools for the SIMATIC S5 and early S7 series, formalizing a Windows-based engineering suite during an era shaped by companies like Microsoft and standards from the VDE and IEC 61131-3. Major milestones include support for the S7-300 and S7-400 families in the 1990s, extension to support industrial Ethernet and PROFINET in the 2000s, and the gradual migration path toward the TIA Portal initiative championed by Siemens in the 2010s. Corporate strategy shifts at Siemens AG and competitive dynamics involving Schneider Electric, ABB, and Mitsubishi Electric influenced Step7 feature roadmaps and licensing approaches. Industry adoption accelerated with large-scale projects at companies like Siemens Energy and infrastructure deployments for operators such as Deutsche Bahn.

Architecture and Features

Step7 is structured as a modular engineering system that combines a hardware configuration editor, network topology manager, logic editors, compile/link tools, and online diagnostics. Its architecture maps directly to Siemens hardware modules—central processing units, input/output modules, communication processors, and function blocks—used by integrators such as Festo and systems integrators like Siemens Advanta. Key features include ladder logic and function block diagramming compliant with IEC 61131-3 influences, block libraries, parameterization for analog and digital I/O, and online trace and force functions deployed in plants run by Bayer and ThyssenKrupp. Diagnostic integration leverages elements of STEP 7 tooling to present module and bus diagnostics, echoing approaches from systems like Yokogawa distributed control systems.

Programming Languages and Interfaces

Step7 supports several programming paradigms and interfaces tied to industrial standards: statement list (STL), ladder diagram (LAD), and function block diagram (FBD), reflecting practices codified alongside IEC 61131-3 influenced implementations. The suite exposes communication interfaces using MPI and Profibus DP protocols and later Profinet IO stacks for integration with devices from vendors such as Phoenix Contact and Weidmüller. Integration APIs and data exchange formats allow connectivity to supervisory systems like OSIsoft PI System and third-party HMIs. For automation engineers migrating to newer toolchains, Siemens provided conversion utilities toward the Totally Integrated Automation Portal ecosystem, aligning with trends at industrial IT vendors like IBM and Siemens Industry Software.

Applications and Industry Use

Step7 is widely used in discrete and process industries for factory automation, process control, building automation, and infrastructure projects. Typical deployments include assembly lines in facilities run by Daimler, batch processing at chemical plants owned by Dow Chemical, water treatment control for municipal systems such as works commissioned by Veolia, and energy management in power plants built by GE Power and Siemens Energy. Systems integrators apply Step7 to implement safety instrumented functions in collaboration with safety standard bodies and device vendors like Pilz and Rockwell Safety Center for machine safeguarding and SIL-rated solutions. Because of the Siemens ecosystem footprint, many OEMs and machine builders standardize on Step7 for commissioning and lifecycle support.

Licensing and Versions

Step7 is distributed under proprietary licensing terms by Siemens AG and historically offered as boxed software, site licenses, and bundled bundles with SIMATIC hardware. Major version streams include the classic Step7 V5.x line and the migration pathway toward the TIA Portal suite, which consolidated Step7 functionality with SIMATIC WinCC and other tools. Licensing models and support contracts are negotiated with Siemens regional subsidiaries such as Siemens USA and Siemens Deutschland; third-party maintenance providers and integrators like Rittal offer complementary services. Upgrading between versions often requires attention to CPU firmware compatibility and archived project conversion validated against standards set by IEC committees.

Category:Siemens software