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Logic module LOGO!

Logic module for switching and controlling

With the logic module LOGO! system Siemens offers you the ideal controller for simple automation tasks in industry and building services. The consistently modular design of LOGO! makes it extremely flexible. A wide range of modules allows individual expansion of LOGO! to 24 digital inputs, 16 digital outputs, 8 analog inputs and 2 analog outputs! Communication modules are also available for AS-Interface and KNX (Instabus network for building automation). Now it is also possible to use the analog output module to solve simple closed-loop control tasks. Heating and cooling systems can be designed with the RTD PT100 module using special functions for PI control, ramp response and analog multiplexer.
LOGO! exists in the version LOGO! Basic with integrated display and in the version
LOGO!Pure without display.


  • The ideal controller for simple automation tasks
  • Reduces costs - replaces many conventional switching control devices, 
  • Reduces time requirements – simplified wiring and panel layout, 
  • Reduces space requirements in the switching cabinet - modules based on a 4 width industry standard dimension replace a wide variety of relays, timer switches and contactor relays
  • Offers the widest range of capabilities and successful implementation of extensive applications with the option of selecting from 38 integrated functions and linking up to 200 of them in the user program
  • Operator control and monitoring are made extremely user-friendly by means of a 4 line, 32 characters per line, backlit display. 
  • This allows for the display of text, action items and current values, bar graphs and I/O status. Parameter values can also be changed in the message text.
  • Additional external text display extends the possibilities for operator control and monitoring 
  • The LOGO! is suitable for almost any small industrial or non-manufacturing commercial application.
  • Together with the LOGO! Soft Comfort software, configuring of the logic module is simply intuitive: program generation, project simulation and documentation are accomplished using drag and drop functionality, allowing maximum ease of operation.

Area of application
The logic module LOGO! is proven millions of times – in numerous applications:

Machine controls

  • Motor, pump and valve controls
  • Air compressors
  • Exhaust and filtering systems
  • Water-treatment plants
  • Woodworking machinery
  • Etching and purification plants

Transport facilities

  • Conveyor systems
  • Hoisting platforms
  • Elevators
  • Silo facilities
  • Livestock feed delivery

Operational monitoring systems

  • Access control
  • Vehicle control monitoring
  • Alarm systems
  • Level limit monitoring
  • Traffic light control systems
  • Baggage handling

Residential and commercial building services

  • Interior and exterior lighting control
  • Door/gate control
  • Shutter, sun blind and awning control
  • Irrigation system control

Unique applications

  • Solar-electric systems
  • Marine
  • Harsh environments
  • Display panels and traffic control signs

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