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Compact machine control
Use onboard digital and analog I/O for self-contained machines where panel space and straightforward expansion matter.
Siemens SIMATIC S7-1200 Classic
Siemens SIMATIC S7-1200 Classic is the established compact-controller platform for small automation systems. This collection covers standard Classic CPUs and their matching signal and communication modules, kept separate from the newer S7-1200 G2 platform.
View productsSIMATIC S7-1200 Classic products
Browse the first curated S7-1200 Classic range by CPU, signal module and communication function. Each product page is organized around the complete Siemens article number so the electrical version and system fit can be checked before ordering.
Showing 10 of 10
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1211C DC/DC/DC 6ES7211-1AE40-0XB0
6ES7211-1AE40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1212C AC/DC/Relay 6ES7212-1BE40-0XB0
6ES7212-1BE40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1212C DC/DC/DC 6ES7212-1AE40-0XB0
6ES7212-1AE40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1214C AC/DC/relay 6ES7214-1BG40-0XB0
6ES7214-1BG40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1214C DC/DC/DC 6ES7214-1AG40-0XB0
6ES7214-1AG40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1215C DC/DC/DC 6ES7215-1AG40-0XB0
6ES7215-1AG40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 CPU 1217C DC/DC/DC 6ES7217-1AG40-0XB0
6ES7217-1AG40-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 SM 1221 16 DI 24 V DC 6ES7221-1BH32-0XB0
6ES7221-1BH32-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 SM 1222 16 DO 24 V DC 6ES7222-1BH32-0XB0
6ES7222-1BH32-0XB0
New Original
$999.00
In Stock
Industrial automation component
Siemens SIMATIC S7-1200 SM 1223 8 DI / 8 Relay DO 6ES7223-1PH32-0XB0
6ES7223-1PH32-0XB0
New Original
$999.00
In Stock
S7-1200 Classic portfolio
The initial catalog focuses on the core hardware used to build and extend a standard S7-1200 Classic control system.
Standard CPUs
Compact CPU 1211C, 1212C, 1214C and 1215C variants with onboard I/O. Match the full article number to the required supply and output type.
Digital signal modules
SM 1221, SM 1222 and SM 1223 modules for adding digital inputs, digital outputs or mixed digital I/O to supported CPUs.
Analog signal modules
SM 1231 and SM 1232 modules for analog measurement and control signals, including current and voltage ranges.
Communication modules
CM 1241 modules for adding serial RS232 or RS422/485 communication to an S7-1200 Classic station.
How to select an S7-1200 Classic part
Start with the complete CPU order number, then verify the required onboard I/O, supply and output technology before choosing expansion modules.
S7-1200 G2 is a separate platform and is not hardware-compatible with the previous SIMATIC S7-1200 family. Do not mix G2 and Classic hardware selections.
- 01
CPU electrical version
CPU names alone are not enough to identify the electrical version. DC/DC/DC, AC/DC/relay and DC/DC/relay variants use different article numbers.
- Confirm the full Siemens article number
- Check the supply voltage
- Check transistor or relay outputs
- 02
Integrated I/O and memory
Choose the CPU size around the required onboard digital and analog channels, work memory and technology functions.
- Count digital inputs and outputs
- Confirm analog channels
- Allow capacity for the control program
- 03
Expansion requirements
Check how many signal boards, signal modules and communication modules the selected CPU supports before finalizing the station layout.
- List required local I/O
- Identify serial or network interfaces
- Verify module limits for the chosen CPU
- 04
Firmware and engineering software
Confirm the CPU firmware and the minimum STEP 7 version stated on the exact product data sheet.
- Check the current firmware version
- Check the required STEP 7 version
- Review the project and replacement constraints
Typical control tasks
The modular, space-saving S7-1200 Classic platform combines a compact CPU, integrated PROFINET and expandable I/O for small automation systems.
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Expandable local I/O
Add signal boards or signal modules when the application grows beyond the channels integrated in the selected CPU.
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Serial device integration
Add an appropriate CM 1241 module when the station must communicate with equipment over RS232 or RS422/485.
Official documentation
Use Siemens documentation to confirm the exact article number, current lifecycle status and system limits.
SIMATIC S7-1200 product catalogOfficial Siemens catalog structure for S7-1200 CPUs, I/O and supporting hardware.SIMATIC S7-1200 Easy BookSiemens introduction to the S7-1200 system, integrated functions and expansion concept.SIMATIC S7-1200 G2 platformOfficial Siemens overview of the separate S7-1200 G2 generation and its compatibility boundary.
S7-1200 Classic questions
Use these checks to avoid mixing CPU variants or hardware generations.
What does S7-1200 Classic mean on Xindustra?
It is our collection name for the established SIMATIC S7-1200 hardware family that Siemens lists separately from S7-1200 G2. It groups standard Classic CPUs and matching expansion modules under one purchasing path.
Can S7-1200 G2 hardware be mixed with S7-1200 Classic hardware?
No. Siemens states that S7-1200 G2 is not hardware-compatible with the previous SIMATIC S7-1200 family, so the two platforms must be selected separately.
Why is the complete Siemens article number important?
The CPU family name can cover different supply and output configurations. The complete article number identifies the exact electrical version and should be matched before ordering or replacing hardware.
Need help selecting an S7-1200 Classic part?
Send the existing Siemens article number, required quantity and application details so we can confirm the correct product variant.
Request a quote