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  Industrial software
    - PLC
    - HMI
    - SCADA

Siemens S7 PLC programmers and programmable logic controllers (PLCs)


S7 400

S7 300

S7 1200

S7 200


Xybella supplies the following expertise:

Siemens Step 7 PLC / Siemens programmers

A Siemens programmer has a good understanding of automation software across the whole range of Siemens equipment. This includes; PLCs, HMIs, SCADA systems and Motion control.

Siemens S7 programmers / Siemens S7 software engineers

A Siemens S7 programmer or software engineer is able to configure all the Siemens range of control equipment to produce a working solution i.e. PLC, HMI or SCADA, drives, sensors and the control networks PPI, MPI, Profibus, Profinet and ASi.

Siemens S7 PLC programmer (Control know-how)
A Siemens S7 PLC programmer can write PLC code using Simatic Step 7 Micro/WIN, Simatic STEP7, Simatic Step 7 TIA Basic and Simatic Step 7 TIA Professional.

Siemens Simatic S7/Step 7
Siemens S7 Micro/Win programmers
Simatic Step 7-Micro/WIN provides Statement list (STL) and ladder (LAD) programming environment for S7-200.

Siemens Step 7 programmers
Simatic Step 7 provides a range of languages including; Ladder (LD), Function Block Diagram (FBD), Statement List (STL) , Graph and Structured Control Language (SCL) for S7-300 and S7-400 PLCs. Siemens S7 Totally Integrated Automation portal (TIA portal) programmers.

Siemens Step 7 Totally Integrated Automation (TIA) programmers
Simatic Step 7 Totally Integrated Automation (TIA) Basic provides a range of languages including; Ladder (LD), Structured text (SCL), Function Block Diagram (FBD)and includes WinCC Basic for HMI configuration for S7-1200 PLC.

Simatic Step 7 Totally Integrated Automation (TIA) Professional provides a range of languages including; Ladder (LD), Structured Control Language (SCL),Function Block Diagram (FBD), Statement List (STL), Graph(SFC). The software package also includes WinCC Basic for HMI configuration. The software may program S7-1200, S7-300,S7-400 PLCs.

The programmer also has knowledge of how to control equipment such as motors, valves and electrical solenoids together with an understanding of how to read analogue values and interpret digital signals.

Note: Siemens languages STL, SCL and Graph are equivalent to IEC 61131-3 Instruction List (IL), Structured Text (ST) and Structured Function Chart (SFC).

Siemens S7 PLC engineer (Hardware expert)

A Siemens S7 PLC engineer may design and specify all the PLC hardware required to interface to the equipment under control.



Siemens Simatic S7/Step 7 PLC range (6ES7)

Size / Capacity PLC range name Product Code Comms Ports I/O Card system Programming software
S7 400 6ES7412
MPI and/or Profibus Rack base

Step 7
(Address based)
TIA Step 7 Professional
(Tag based)

S7 300


MPI and/or Profibus Rack base SIMATIC
Step 7
(Address based)
TIA Step 7 Professional
(Tag based)


S7 1200


PROFINET Fixed I/O expansion via interlocking cards SIMATIC
Step 7 Basic
(Tag based)
S7 200 6ES7211
PPI Fixed I/O expansion via interlocking cards

Step 7-MicroWIN
(Address based)


S7_400 Siemens Step 7/Step7/S7 S7400, S7 400, S7-400 PLC programmers
The S7 400 has the fastest communications update rate, largest memory and highest I/O capacity of the S7 range. Its programs can control whole plant areas. Multiple programmers are able to write code concurrently while online to a single PLC. Typical applications include batch control, complex machinery and process control.
S7_300 Siemens Step 7/Step7/S7 S7300, S7 300, S7-300 PLC programmers
The S7 300 is ideal for standalone machines and processes. The memory sizes and speed processors have been continuously improved together with its many communications options. This range od PLCs provides a powerful solution for many applications.
S7_1200 Siemens Step 7/Step7/S7 S71200, S7 1200, S7-1200 PLC programmers
The latest addition to the S7 range. It was the first to use Siemens tag based PLC programming software, Step 7 TIA. The software also includes a built in version of the HMI software, WinCC Flexible.
S7_200 Siemens Step 7/Step7/S7 S7200, S7 200, S7-200 PLC programmers
Although the PLC has the smallest footprint of the S7 range it comes with many advanced programming wizards which reduce coding time and improve reliability.

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Our expertise is covered under the following general titles: System integrators, Control system software engineers, Automation support engineers, PLC integrators, Control systems, Software programming.