SIMATIC S7-1200 - Can be flexibly tailored to your requirements

Flexible thanks to a wide range of communication options

The intelligent choice for automation solutions in the low and middle performance range.

Basic controllers are the intelligent choice for compact automation solutions with integrated communication and technology functions. They are available in standard and failsafe versions.

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System overview

SIMATIC S7-1200 – Be flexible thanks to networking possibilities

SIMATIC S7-1200 Basic Controllers are the ideal choice when it comes to flexibly and efficiently performing automation tasks in the lower to medium performance range. They feature a comprehensive range of technological functions and integrated IOs as well as an especially compact and space-saving design.

Impressive functionality

Compact size with integrated IOs and modular expansion options

Thanks to extensive expansion options, SIMATIC S7-1200 can be perfectly tailored to the specific automation task.

The integrated PROFINET interface ensures that additional automation components and the TIA Portal engineering framework work perfectly together.

The modular board concept makes it easy to expand the controller without changing the physical size.

Error messages are displayed in plaintext in the TIA Portal on the HMI or web server

Efficient troubleshooting and rapid error localization with the new uniform display concept reduce commissioning times and minimize production downtimes.

SIMATIC S7-1200 offers you a diagnostics functionality that is already integrated in the system with no additional programming required.

Protected CPU access with copy and know-how protection functions

Protection against unauthorized modifications to code or process values requires a higher level of availability in operation. Know-how protection, copy protection, and access protection prevent unauthorized parties from opening or duplicating modules and protect your algorithm and process. These security functions are integrated into the S7-1200 and the TIA Portal.

Failsafe CPUs for standard and safety applications

The failsafe CPU is suitable for standard and failsafe applications in the machine and plant automation.

Safety Integrated provides for a connection to PROFIsafe devices via PROFINET.

In the STEP 7 Safety Basic engineering tool, users create their programs with the same engineering and operating concept for standard and safety-related tasks. 

Technology Integrated: integrated functions and flexible connection of drives

Integrated technology functions for counting and measuring tasks, regulation and motion control make the SIMATIC S7-1200 a versatile system that is perfectly suited for numerous automation tasks.

Thanks to the integrated PID controllers, you can precisely and efficiently adjust physical variables (such as room temperature) to a specific target value.

All CPUs support the trace function. This makes it possible to precisely diagnose and optimize user programs and motion applications.

Efficient engineering in the TIA Portal

The Totally Integrated Automation Portal (TIA Portal) provides you with complete access to the entire digitalized automation system, from digital planning to integrated engineering to transparent operation. The new version decreases the time-to-market through a variety of measures including simulation tools, increases the productivity of your plant through additional diagnostic and energy management functions, and offers you greater flexibility thanks to a connection to the management level.

TIA Portal offers flexible cloud solutions, virtual commissioning with a digital twin, coordinated teamwork in interdisciplinary teams, greater transparency, and integrated energy management.

Learn more about the TIA Portal

TIA Portal Tutorial Center

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Product range

The SIMATIC S7-1200 modules at a glance

The S7-1200 controller is designed as a compact CPU, which means that IOs are already integrated. Yet the S7-1200 station can be equipped with additional IO modules to enlarge the capabilities of the PLC.


The modular SIMATIC S7-1200 controller is at the core of our offering for simple but highly precise automation tasks. The SIMATIC S7-1200 controller is modular and compact, versatile, a secure investment, and is perfectly suited to a whole range of applications.

The S7-1200 CPUs with Safety Integrated handle both standard and safety-related tasks.
A compact design with integrated IO, communication interfaces that meet the highest industry requirements and a range of powerful integrated technological functions make this controller an integral part of a comprehensive automation solution.

Standard CPUs for simple to medium tasks

All CPUs can be expanded by an additional signal board and up to 3 Communication modules. The number of integrated IOs as well as  additional Signal Modules differs according to the type of the chosen CPU.

S7-1200 - CPU 1211C

  • 3 different variants available
    CPU 1211 DC/DC/DC
    CPU 1211 DC/DC/Relais
    CPU 1211 AC/DC/Relais
  • 50 KB work memory / 1 MB Load memory
  • 3 fast counters (100 kHz)
  • 6 DI /4 DQ  integrated
  • Expandable by
    - 1 signal board (SB)

S7-1200 - CPU 1212C

More memory, more integrated IOs and more expansion possibilities in comparison to CPU 1211C

  • 3 different variants available
    CPU 1212 DC/DC/DC
    CPU 1212 DC/DC/Relais
    CPU 1212 AC/DC/Relais
  • 75 KB work memory / 2 MB Load memory
  • 4 fast counters (three with max. 100 kHz; one with max. 30 kHz)
  • 8 DI /6 DQ  and 2 AI integrated
  • Expandable by:
    - 1 signal board (SB)
    - 2 signal modules (SM)
    - 3 communication modules (CM)

S7-1200 - CPU 1214C

More memory, more integrated IOs and more expansion possibilities in comparison to CPU 1212C

  • 3 different variants available
    CPU 1214 DC/DC/DC
    CPU 1214 DC/DC/Relais
    CPU 1214 AC/DC/Relais
  • 100 KB work memory / 4 MB Load memory
  • 6 fast counters (three with max. 100 kHz; 3 with max. 30 kHz)
  • With 14 DI /10 DQ and 2 AI integrated
  • Expandable by:
    - 1 signal board (SB)
    - 8 signal modules (SM)
    - 3 communication modules (CM)

S7-1200 - CPU 1215C

More memory, additional Ethernet port and analog outputs in comparison to CPU 1214C

  • 3 different variants available
    CPU 1215 DC/DC/DC
    CPU 1215 DC/DC/Relais
    CPU 1215 AC/DC/Relais
  • 125 KB work memory / 4 MB Load memory
  • 6 fast counters (three with max. 100 kHz; 3 with max. 30 kHz)
  • 2 Industrial Ethernet ports with integrated switch
  • With 14 DI /10 DQ and 2 AI/2 AQ integrated
  • Expandable by:
    - 1 signal board (SB)
    - 8 signal modules (SM)
    - 3 communication modules (CM

S7-1200 - CPU 1217C

More memory , faster counters than  CPU 1215C

  • available as CPU 1217 DC/DC/DC
  • 150 KB work memory / 4 MB Load memory
  • 6 fast counters with max. 1MHz
  • 2 Industrial Ethernet ports with integrated switch
  • With 14 DI /10 DQ and 2 AI/2 AQ integrated
  • Expandable by:
    - 1 signal board (SB)
    - 8 signal modules (SM)
    - 3 communication modules (CM)

Failsafe CPUs for safety related applications

The fail-safe SIMATIC S7-1200 Controllers are based on the S7-1200 standard CPUs and offer additional safety-related functions.

They can be used for safety-oriented tasks according to IEC 61508 up to SIL 3 and ISO 13849-1 up to PL e.

Safety-related programs are created in the TIA Portal. The STEP 7 Safety engineering tool offers commands, operations and blocks for safety-related programs in the LAD and FBD languages. To this end, there is a library with pre-configured, TÜV-approved blocks for safety-related functions.

S7-1200 - CPU 1212FC

  • 2 different variants available
    CPU 1212FC DC/DC/DC
    CPU 1212FC DC/DC/Relais
  • 100 KB work memory / 2 MB Load memory
  • 4 fast counters with max. 100 kHz
  •  With 8 DI /6 DQ and 2 AI integrated
  • Expandable by:
        - 1 signal board (SB)
        - 2 standard or failsafe signal modules (SM)
        - 3 communication modules (CM)

S7-1200 - CPU 1214FC

More memory and more expansion possibilities in comparison to CPU 1212FC

  • 2 different variants available
    CPU 1214FC DC/DC/DC
    CPU 1214FC DC/DC/Relais
  • 125 KB work memory / 4 MB Load memory
  • 6 fast counters with max. 100 kHz
  • With 14 DI /10 DQ and 2 AI integrated
  • Expandable by:
    - 1 signal board (SB)
    - 8 standard or failsafe signal modules (SM)
    - 3 communication modules (CM)

S7-1200 - CPU 1215FC

More memory, an additional Ethernet port and analog outputs in comparison to CPU 1214FC

  • 2 different variants available
    CPU 1215FC DC/DC/DC
    CPU 1215FC DC/DC/Relais
  • 150 KB work memory / 4 MB Load memory
  • 6 fast counters with max. 100 kHz
  • 2 Industrial Ethernet ports with integrated switch
  • With 14 DI /10 DQ and 2 AI/2AQ integrated
  • Expandable by:
    - 1 signal board (SB)
    - 8 standard or failsafe signal modules (SM)
    - 3 communication modules (CM)

SIPLUS S7-1200 - Tougher than the Standard

The SIPLUS extreme variants of the S7-1200 are interpreted especially for particularly demanding environmental conditions. They are characterized by their special refining and offer significant advantages:

  • Protection from medial impact (aggressive chemical, biological and mechanically active gases and salt mist) and condensation

  • High reliability across an extended temperature range in the start-up phase as well as during operation

  • Saving costs, since no additional heating or cooling is required

  • High productivity and investment protection through minimal downtimes and performance losses

  • Altitude up to 5000 meter

Besides the characteristics of the Basic Controller with integrated and decentral IO’s, PROFINET interface for programming and HMI connections, the SIPLUS extreme S7-1200 can provide following advantages for three different variants:

  • Variant 1: conformal coating version for use in corrosive surroundings
  • Variant 2: additional enlarged negative temperature range up to -40 °C (in operation)
  • Variant 3: additional through the equipment of the self-service mounting slots with a cooling element for the extended use up to +70°C


Expanding the CPUs by using additional I/O

The central processing units of the SIMATIC S7-1200 are designed as Compact CPUs with integrated I/Os. Their modular design can be used to increase the configuration limits or to adapt the controller to new tasks: through mounting a Signal Board on the CPU or adding separate signal modules.

Signal modules can be connected to the right of the CPU to further extend the digital or analog IO capacity. CPU 1212C accepts up to two, CPU 1214C, CPU 1215C and CPU 1217C both accept up to eight signal modules.

Signal boards can be added to the CPU to increase the number of digital or analog inputs and outputs, RS485 communication, and battery board to the controller for your application requirements without increasing the controller's footprint.

Signal Boards

Signal boards are connected directly to the front of the CPU. They can be used where space is limited or if only a few additional inputs/outputs are required.

  • Each S7-1200 CPU can be modularly expanded by a signal board.

  • This does not increase the mounting space required for the controller.

  • The portfolio includes digital inputs, digital outputs, mixed digital IOs, analog inputs and analog outputs.


Article No.

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SB 1221 - Digital Inputs

SB 1221 DI 4 x 5V DC 200 KHz
SB 1221 DI 4 x 24V DC 200 KHz

SB 1222 - Digital Outputs

SB 1222 DQ 4 x 5V DC 200 KHz
SB 1222 DQ 4 x 24V DC 200 KHz
SB 1223 Digital I/O
SB 1223 DI 2 x 5V DC / DQ 2 x 5 V DC 200 KHz
SB 1223 DI 2 x 24V DC / DQ 2 x 24 V DC  200 KHz
SB 1223 DI 2 x 24V DC / DQ 2 x 24 V DC
SB 1231 - Analog inputs
SB 1231 AI  1 x 13 bit analog input (voltage/current)
SB 1231 T 1 x 15 Bit analog input (thermocouple)
SB 1231 RTD 1 x 15 Bit analog input (resistance)
SB 1232 - Analog outputs
SB 1232 AQ 1 x 13 bit analog output (voltage/current)

Digital IOs

Digital inputs as supplement to the integral IO of the CPUs

The SM 1221 digital input signal modules convert the level of the external digital signals from the process to the internal signal level of the S7-1200.

  • For flexible adaptation of the controller to the task at hand. This avoids superfluous investment. Modules with 8, 16 and 32 input/output channels are available.

  • For subsequent extension of the system with additional input. If the task is extended subsequently, the controller can be upgraded with one of these digital modules. Updating of the user program in TIA Portal is extremely simple.

The portfolio comprises 12 different modules.



Article No.

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SM 1221 - Digital input modules


SM 1221 DI 8 x 24 V-DC input

SM 1221 DI 16 x 24 V-DC input

SM 1222 - Digital output modules


SM 1222 DQ 8 x 24 V-DC output

SM 1222 DQ 16 x 24 V-DC output

SM 1222 DQ RLY 8 x relay output

SM 1222 DQ RLY 16 x relay output

SM 1222 DQ RLY 8 x relay output changeover

SM 1223 - Digital hybrid modules


SM 1223 DI/DQ 8 x 24 V-DC input / 8 x 24 V-DC-output

SM 1223 DI/DQ 16 x 24 V DC input /16 x 24 V DC output

SM 1223 DI/DQ 8 x 24 V-DC input / 8 x relay output

SM 1223 DI/DQ 16 x 24 V-DC input / 16 x relay output

SM 1223 DI/DQ 8 x 120/230 V-AC input / 8 x relay output

Analog IO modules

Analog expansion modules provide the option for using further analog inputs/outputs in addition to the existing integral analog inputs/outputs.
Signal modules as separate modules can be used with all SIMATIC S7-1200 CPUs except the CPU 1211C

  • The SM 1231 analog input signal modules convert analog signals from the process into digital signals for internal processing by the SIMATIC S7-1200
  • The SM 1231 RTD modules enable temperatures to be measured with high precision using resistance-based temperature sensors.
  • The SM 1231 thermocouple modules enable temperatures to be measured with high precision using established thermocouples
  • The SM 1234 Analog hybrid modules offer digital inputs and outputs in one module with a small footprint.
  • The SM1238 Energy Meter module records measured electrical values, such as voltages up to 480 V AC, in a 1 or 3-phase network with a direct connection but without a transformer.


Article No.

open in TIA Selection Tool

SM 1231 - Analog input modules


SM 1231 AI 4 x 13 bit analog input (voltage/current)

SM 1231 AI 8 x 13 bit analog input (voltage/current)

SM 1231 AI 4 x 16 bit analog input (voltage/current)

SM 1231 AI RTD 4 x 16 bit analog input (resistance)

SM 1231 AI RTD 8 x 16 bit analog input (resistance)

SM 1231 AI TC 4 x 16 bit analog input (thermocouple)

SM 1231 AI TC 8 x 16 bit analog input (thermocouple)

SM 1232 - Analog output modules


SM 1232 DC 2 x 14 bit analog output (voltage/current)

SM 1232 DC 4 x 14 bit analog output (voltage/current)

SM 1234 - Analog hybrid modules


SM 1234 DC/DC 4 x 13 bit analog input / 2 x 14 bit analog output (voltage/current)

SM 1238 – Energy Meter 480VAC


SM1238 Energy Meter Module for recording in 1- and 3-phase networks
(TN, TT) up to 480 V AC; ampere current: 1 A, 5 A

Failsafe digitale module SM1226

The Fail safe signal  modules for digital inputs and outputs (DI and DQ) correspond to the standard modules with respect to their size. Their functional safety is certified according to EN 61508.

They are designed for safety-related use up to SIL 3 according to EN 62061 and PL e accordingto ISO 13849.


Article No.

open in TIA Selection Tool

SM 1226 F-DI 16 x 24 VDC

SM 1226 F-DQ 4 x 24 VDC, 4 x 2A

SM 1226 F-DQ 2 x Relay, 2 x 5A, 30VDC/250V AC

Expanding the system by using special modules

Special modules expand the area of application of the whole system:

  • SM 1281 Condition Monitoring
  • SIM 1274 Input Simulators
  • BB 1297 Battery Board
  • SIWAREX WP231, WP241 and WP251 Weighing Modules
For the SM1278 IO-Link Master see the Communication Modules Tab,


Compact and integrated Condition Monitoring

For permanent status monitoring of critical mechanical components. The recorded data is analyzed by the internal software of the CMS1200 and stored on the SM 1281 condition monitoring module. SIPLUS CMS1200 is fully integrated into the automation system via TIA Portal.

SIM 1274 Input Simulator Modules

The SIM 1274 Simulator Modules provide users the opportunity for testing user programs. Just mount the input simulator on the modular board instead of the digital inputs. So you could manual set input signal. This signal read by the CPU will be processed in the user program.
There are 4 different modules available:

  • SIM 1274, 8 channel DC Input switches for CPU 1211C/1212C
  • SIM 1274, 14 channel DC Input switches for CPU 1214C/1215C
  • SIM 1274,14 Channel (10x 24V DC Input switches,4X 1.5 V Differential Inputs) for CPU 1217C
  • SIM 1274 Analog simulator, 2 Potentiometer inputs for all CPUs of S7-1200

BB 1297 battery board

Battery board for extending the power reserve for the S7-1200 real-time clock
The battery board accommodates a standard button cell (CR1025) for the power supply, which can easily be replaced. The button cell is not included in the scope of supply and must be purchased separately.

The battery board is plugged like a signal board directly into the holder on the front of each S7-1200 CPU (FW 3.0 or higher). The installation dimensions of the CPU remain unchanged.

The maintenance LED on the board indicates when it is necessary to change the button cell. The battery status can be assessed at any time via the CPU user program

SIWAREX WP231, WP241 and WP251

The weighing modules of the SIWAREX-WP2xx series are technology modules of the basic controllers SIMATIC S7-1200 and can be used in many fields of application: Beside that they are seamlessly integrated in TIA Portal.
There are 3 modules available:

  • SIWAREX WP231 is the optimum solution wherever load cells are used for measuring tasks.
  • SIWAREX WP241 is the optimal solution wherever belt scales are used that demand high accuracy, high user-friendliness, and flexible system integration. 
  • SIWAREX WP251 is a flexible weighing module for fast and precise dosing and filling processes.

Communication modules and boards

The integrated PROFINET interface in SIMATIC S7-1200 can be used for programming the CPU and for communication with SIMATIC HMI Basic Panels for visualization, but also for communication with other controllers or IO devices such as drives.

Communication modules increase the communication capabilities of the SIMATIC S7-1200 through additional functions and interfaces. S7-1200 communication modules support serial communication, PROFIBUS, IO-Link , AS-Interface and several mobile standards.

Simple Communication Modules and boards

Serial communication

The RS485 and RS232 communication modules are suitable for serial, character-based point-to-point connections.
The library functions USS Drive Protocol and Modbus RTU Master and Slave Protocol are already included in the SIMATIC STEP 7 basic engineering system.
The CM 1241 communication modules are used for quick, high-performance serial data exchange via point-to-point connection and available for the RS232 or RS422/485 physical transmission properties

The CB 1241 communication board RS 485 can be plugged directly into all SIMATIC S7-1200 CPUs


Integration of identification systems

Using the RF120C communication module all SIMATIC identification systems (RF200/300/600 and optical reader system MV400) can be connected directly to the SIMATIC S7-1200. A reader can be connected to a RF120C via the point-to-point connection. The RF120C also provides a library with application blocks that are very easy to handle. Configuration is carried out via the TIA Portal.


Article No.

open inside TIA Selection Tool

CM 1241 RS232  

CM 1241 RS422/485

CB 1241 RS485

RF120C RS422

DP Master and DP Slave Modules

The use of the SIMATIC S7-1200 as a master or slave on the proven PROFIBUS field bus facilitates standardized communication from the field level through to the control level. This meets one of the most important requirements in the performance range of compact automation.
For the connection of the S7-1200 to PROFIBUS there are two communication modules (CMs):

  • The DP-Master CM 1243-5 enables as many as 16 field devices to be connected as slaves, e.g. ET 200 distributed I/O modules.
  • Together with the CM 1242-5, the S7-1200 functions as a DP-Slave and can thus be connected to any DP-Master.  


Article No.

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CM 1242-5 DP slave

CM 1243-5 DP master

CM 1243 AS-i Master

AS-i is an open, manufacturer-independent bus system that organizes the transmission of digital and analog process and machine signals into the control system. The AS-i Master communication module, as the "heart" of the AS-i Fieldbus can record sensors in the field or control actuators in the field.

The connection of an AS-i network to the SIMATIC S7-1200 is quite simple:
The AS-i Master CM 1243-2 communication module is simply plugged into the CPU and wired to the field. The AS-i Master CM 1243-2 thus connects the lowest field level, such as IO modules, position switches, signaling columns, load feeders and motor starters with the higher-level SIMATIC S7-1200 control system.
For each master, up to 62 AS-Interface slaves can be connected.
All the advantages of the TIA Portal apply, such as the fully graphical parameter assignment and diagnostics of all AS-i stations without additional software.

SM 1278 IO-Link Master

Module for connecting up to 4 IO-Link devices according to IO Link Specification V1.1. The IO-Link parameters are configured using the Port Configuration Tool (PCT), version V3.2 and higher.

The SM 1278 module enables data exchange with up to 4 external IO-Link devices via one 3-wire cable each or four standard actuators/standard sensors. Comprehensive parameterization options make it possible to adapt the controller flexibly to the communication partner. Thanks to the compatibility of IO-Link with standard sensors, commercially available sensors in accordance with IEC 61131 Type 1 can also be operated on the IO-Link master.

Communication modules for remote applications

The telecontrol communication processors offer a range of different possibilities for the implementation of extremely versatile and cost-efficient Telecontrol remote stations (RTUs) based on SIMATIC S7-1200.

TeleControl Basic

TeleControl Basic is based on SIMATIC S7-1200 and secure transmission via mobile radio or the Internet. It is particularly suitable wherever small data quantities have to be transmitted over wireless connections or via the Internet. TeleControl Basic can be used as a low-cost fault signaling system, but thanks to the bidirectional communication facility, it is also suitable for simple telecontrol monitoring and control tasks.

  • The GPRS CP 1242-7 enables SMS messaging for event driven fault diagnostics using general packet radio service (GPRS).. Additional full Teleservice functionally can be realized for remote diagnostics, configuration & programming.
  • CP 1243-7 LTE is used to connect the S7-1200 to a mobile wireless 4th generation LTE (Long Term Evolution) network. The increased data rates compared to GPRS and widespread introduction of LTE open up new areas of application.
  • The CP 1243-1 communications processor is used for connecting the SIMATIC S7-1200 to telecontrol centers via remote networks and telecontrol protocols (DNP3, IEC 60870-5-104, TeleControl Basic), and for safe communication via IP-based networks.




Article No.

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CP 1242-7 GPRS

CP 1243-7 LTE (European frequency range)
CP 1243-7 LTE (American frequency range)

CP 1243-1

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