The Siemens S7-200 PLC is a very popular choice, when you start PLC Image result for Siemens plc S7 200programming. It is the cheapest PLC from Siemens, and it is very easy to begin programming. The Siemens S7-200 has a limited variety of functions, but it certainly also has a lot of advantages. With this article, you will be ready to start configuring and programming the Siemens S7-200 PLC.

As you may know, the PLC product line from Siemens is named S7 or Step 7 PLC’s. The smallest PLC model is the Siemens S7-200 PLC. In the line of PLC’s you will also find the Siemens S7-300, Siemens s7-400, Siemens S7-1200 and the most advanced PLC system in the line; Siemens S7-1500.

Even though the S7-200 PLC system is still the cheapest it is now the latest series of Siemens PLC’s. Siemens has made a new kit for learning PLC programming. If you are serious about learning PLC programming you should take a look at the Siemens S7-1200 Starter Kit, which comes with the latest STEP 7 Basic TIA Portal (version 13).

Beside being cheap, the Siemens S7-200 PLC is also quite user friendly. If you read further down this article, you will notice that this Siemens PLC is actually very easy to connect to, configure, program and debug your programs. You can be programming ladder logic for Siemens S7-200 after just a quick configuring of the PLC programming environment.

The reason, this PLC is so easy to work with is that you use Siemens STEP 7 Micro/WIN to program the PLC. More about that piece of PLC programming software later in this article.

First a little look on the various modules you can get for the S7-200 PLC system.

Image result for Siemens plc S7 200

The first module for the S7-200 series is the CPU module. This is a necessary module, and you will always need at least one of these. A Siemens S7-200 CPU module contains the CPU PLC hardware. This is the module that has your PLC program stored and runs it.

There are several CPU modules for the S7-200 available. Some with digital inputs and outputs only, some with analog inputs and outputs, and some with expansion modules available.

CPU 221

S7-200 CPU221 module

CPU221 module from the Siemens S7-200 PLC series.

  • 6 digital inputs
  • 4 digital outputs
  • Not expandable with modules
  • Siemens article number: 6ES7211-0BA22-0XB0

CPU 222

Siemens S7-200 CPU222 module

Siemens S7-200 CPU222 module.

  • 8 digital inputs
  • 6 digital outputs
  • Up to 2 expansion modules
  • Siemens article number: 6ES7212-1AB22-0XB0

CPU 224

CPU224 PLC CPU module from S7-200 series

CPU224 PLC CPU module from the S7-200 series.

  • 14 digital inputs
  • 10 digital outputs
  • Max. 7 expansion modules
  • Siemens article number: 6ES7214-1BD22-0XB0


Siemens S7-200 CPU224XP module.

Siemens S7-200 CPU224XP module.

  • 14 digital inputs
  • 10 digital outputs
  • 2 analog inputs
  • 1 analog output
  • Up to 7 expansion modules
  • Siemens article number: 6ES7214-2AD23-0XB0
6AG1216-2BD23-2XB0 Spare part*** SIPLUS S7-200 CPU 226 -25...+70°C with conformal coating based on 6ES7216-2BD23-0XB0. Compact unit, AC Power supply 24 DI DC/16 DO relay 16/24 KB progr./10 KB data, 2 PPI/freely prog. interface