SIEMENS Basic Controllers S7-1200 Overview/Application/Design


  • Compact controllers for the low to mid-performance ranges
  • Large-scale integration, space-saving, powerful
  • With exceptional real-time performance and powerful communication options:
    • Controller with integrated PROFINET IO Controller interface for communication between SIMATIC controllers, HMI, programming device or other automation components
  • All CPUs can be used in stand-alone mode, in networks and within distributed structures
  • Extremely simple installation, programming and operation
  • Integrated web server with standard and user-specific web pages
  • Data logging functionality for archiving of data at runtime from the user program
  • Powerful, integrated technology functions such as counting, measuring, closed-loop control, and motion control
  • Integrated digital and analog inputs/outputs
  • Flexible expansion facilities
    • Signal boards for direct use in a controller
    • Signal modules for expansion of controllers with input/output channels;
      including an Energy Meter module for recording and preparing energy data
    • Accessories, e.g. power supply, switch module or SIMATIC Memory Card


The SIMATIC S7-1200 is the controller for open-loop and closed-loop control tasks in mechanical equipment manufacture and plant construction.

Due to the compact modular design with a high performance at the same time, the SIMATIC S7-1200 is suitable for a wide variety of automation applications. Its range of use extends from the replacement of relays and contactors up to complex automation tasks in networks and within distributed structures.

The S7-1200 also increasingly opens up areas for which special electronics was previously developed for economical reasons.

Application examples include, for example:

  • Placement systems
  • Conveyor systems
  • Elevators and escalators
  • Material transportation equipment
  • Metalworking machinery
  • Packaging machines
  • Printing machines
  • Textile machines
  • Mixing systems
  • Freshwater treatment plants
  • Wastewater treatment plants
  • External displays
  • Electricity distribution stations
  • Room temperature control
  • Heating/cooling system control
  • Energy management
  • Fire protection systems
  • Air conditioning
  • Lighting control
  • Pump control
  • Security/access control systems


The S7-1200 is characterized by:

  • Easy getting started:
    Special starter packages including simulators and documentation facilitate familiarization.
  • Uncomplicated operation:
    Powerful standard commands which are simple to use, together with the user-friendly programming software, reduce the programming overhead to a minimum.
  • Real-time properties:
    Special interrupt functions, fast counters, and pulse outputs permit use even with time-critical processes.

The SIMATIC S7-1200 meets national and international standards:

  • UL 508
  • CSA C22.2 No. 142
  • FM Class I, Div 2, Groups A, B, C, D; T4A Class I, Zone 2, IIC, T4
  • VDE 0160
  • EN 61131-2
  • Requirements of the EMC directive in accordance with EN 50081-1, 50081-2 and 50082-2

Technical specifications

General technical specifications

Degree of protection

IP20 acc. to IEC 529

Ambient temperature

  • Operation
    (95% humidity)
  • Horizontal installation

-20 … +60 °C

  • Vertical installation

-20 … +50 °C

  • Transportation and storage

-40 … +70 °C

  • With 95% humidity

25 … 55 °C


  • 5/24 V DC circuits

500 V AC test voltage

  • 115/230 V AC circuits to ground

1500 V AC test voltage

  • 115/230 V AC circuits to 115/230 V AC circuits

1500 V AC test voltage

  • 230 V AC circuits to 5/24 V DC circuits

1500 V AC test voltage

  • 115 V AC circuits to 5/24 V DC circuits

1500 V AC test voltage

Electromagnetic compatibility

Requirements of the EMC directive

  • Noise immunity acc. to
    EN 50082-2

Test acc. to:
IEC 801-2, IEC 801-3, IEC 801-4, EN 50141, EN 50204, IEC 801-5, VDE 0160

  • Emitted interference acc. to EN 50081-1 and
    EN 50081-2

Test according to
EN 55011, Class A,
Group 1

Mechanical strength

  • Vibrations, test acc. to / tested with

IEC 68, Part 2-6:
10 … 57 Hz;
constant amplitude
0.3 mm;
58 … 150 Hz;
constant acceleration 1 g (mounted on DIN rail) or
2 g (mounted in switchboard);
mode of vibration:
frequency sweeps with a sweep rate of 1 octave/minute;
duration of vibration:
10 frequency sweeps per axis in each direction of the three mutually perpendicular axes

  • Shocks, test acc. to / tested with

IEC 68, Part 2-27/half-sine:
magnitude of shock 15 g (peak value), duration 11 ms, 6 shocks in each of the three mutually perpendicular axes


The SIMATIC S7-1200 family consists of the following modules:

  • Compact controllers with graded performances in different versions as wide-range AC or DC controllers.
  • Signal boards (analog and digital) for low-cost modular controller expansion directly on the CPU, with retention of the mounting space.
  • Different digital and analog signal modules.
  • Different communication modules and processors.
  • Ethernet switch with 4 ports for implementation of many different network topologies
  • SIWAREX weighing systems terminal module
  • PS 1207 stabilized power supply units, line voltage 115/230 V AC, rated voltage 24 V DC

Mechanical features

  • Easy mounting of the modules on a standard DIN rail or in a control panel
  • Rugged, compact plastic enclosure
  • Easily accessible connection and control elements, protected by front flaps
  • Removable connection terminals, also for analog or digital expansion modules

Device features

  • International standards:
    SIMATIC S7-1200 complies with the standards according to VDE, UL, CSA and FM (Class I, Category 2; Danger zone groups A, B, C and D, T4A). The quality management system used during production is certified according to ISO 9001.

The SIMATIC S7-1200 is equipped with different communication mechanisms:

  • Integrated PROFINET IO Controller interface
  • Communication module with PROFIBUS DP master interface
  • Communication module with PROFIBUS DP slave interface
  • GPRS module for connection to GSM/G mobile phone networks
  • LTE module for communication in mobile phone networks of the fourth LTE generation (Long Term Evolution).
  • Communications processor for connection to TeleControl Server Basic control center software control center software via Ethernet, and for safe communication via IP-based networks.
  • Communications processor for connection to control centers for telecontrol applications.
  • RF120C for connection to SIMATIC Ident systems.
  • Module SM1278 for connecting IO-Link sensors and actuators.
  • Point-to-point connection via communication modules.

PROFINET interface

The integral PROFINET interface permits communication with:

  • Programming device
  • HMI devices
  • Other SIMATIC controllers
  • PROFINET IO automation components

The following protocols are supported:

  • TCP/IP
  • ISO-on-TCP
  • S7 communication

The following can be connected:

  • Field PG programming device and PCs via standard CAT5 cable.

Connection between PG and CPU of SIMATIC S7-1200

  • SIMATIC HMI Basic Panels

Connection between Basic Panel and CPU of SIMATIC S7-1200

  • Further SIMATIC S7-1200 controllers

Connection of several devices via CSM 1277 Ethernet switch

Point-to-point interface, freely-programmable interface mode

Communication modules permit communication via point-to-point connections. The RS 232 and RS 485 physical transmission media are used. Data transmission is carried out in the “Freeport” mode of the CPU. A user-specific, bit-oriented communication protocol is used (e.g. ASCII protocol, USS, or Modbus).

Any terminal equipment with a serial interface can be connected, e.g. drives, printers, bar code readers, modems, etc.

Point-to-point connection via CM 1241 in programmable interface mode