SIEMENS LOGO! modular basic variants – PLCs

LOGO! Overview

  • The space-saving basic variants
  • Interface for the connection of expansion modules, up to 24 digital inputs, 20 digital outputs, 8 analog inputs and 8 analog outputs can be addressed
  • All basic units with integrated web server
  • Enclosure width 72 mm (4 U)
  • All basic units with Ethernet interface for communication with LOGO! 8, LOGO! TDE, SIMATIC Controllers, SIMATIC Panels and PCs
  • Use of standard micro CF cards

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  • Ethernet port
  • Relay outputs with max. 10 A output current
  • Integrated display field with parameterizable backlight (6 x 16 characters, 3 background colors).
  • Integrated operator control panel.
  • Integrated EEPROM memory for control program and setpoint values.
  • Optional standard micro CF cards
  • Integral real-time clock with automatic summer/winter time adjustment.
  • Backup of the integrated real-time clock for 20 days.
  • 8 digital inputs, 4 digital outputs.
  • 4 inputs as analog inputs in 12/24 V DC variants (0 to 10 V); inputs can also be used digitally.
  • 4 inputs can be used for high-speed counting up to 5 kHz (DC versions only).
  • Interface for the connection of expansion modules, up to 24 digital inputs, 20 digital outputs, 8 analog inputs and 8 analog outputs can be addressed.
  • Connection of LOGO! TDE via Ethernet.


  • Integrated basic and special functions:
    • Basic logic functions:
      AND, OR, NOT, NAND, NOR, XOR, positive/negative pulse edge evaluation.
    • Special functions:
      ON delay, latching ON delay, OFF delay, impulse relay, locking relay, counter (forward/backward), time switch, interval time-delay relay, operating hours counter, trigger, asynchronous pulse generator, year time switch, comfort light switch function, random generator, staircase light switch function as per DIN 18015-2, edge-triggered interval time-delay relay, combined ON/OFF delay, analog comparator, analog trigger, analog delta trigger, analog watchdog, analog amplifier, text and variable display, shift register, soft key function, PI controller, ramp function, analog multiplexer, PWM function, analog arithmetic function, function for detecting errors in the analog arithmetic function.
  • 400 function blocks can be interlinked
  • Up to 64 bit memories
    (including restart bit memory, bit memory for controlling the backlight of the integral display and the LOGO! TDE, bit memory for switching between 2 parameterizable character sets in the message text).
  • Integrated retentivity.
  • Password protection.
  • Additional know-how protection with the optional micro CF card.
  • Data logging to internal memory or micro CF card (up to 20 000 records)
  • Macros (user-defined functions) for LOGO! Soft Comfort
  • 64 open terminals
  • 4 8-bit shift registers
  • Extended diagnostic functions


With LOGO!, Siemens offers you the ideal controller for simple automation tasks in industry and building services. The modular design of LOGO! makes it consitently flexible.
A wide range of modules allows you to create configurations to meet your needs.

LOGO!8 Basic

LOGO!8 The new generation

This new model accommodates virtually every application demand with simplified handling, a new display, and full communication options via Ethernet. The web server application makes everything very simple.

A New 6 line display with 16 characters per line. Means twice the number of characters per message and allows you to create clearessages. Three backlight colors are selectable.
Remote communication via  mobile network (GSM), time synchronisation and position detection (GPS) provided by a communication module CMR completes the spectrum of new opportunities for LOGO!.

LOGO! (0BA7) — with Ethernet

Have you grown with LOGO! and do you want to always be able to solve more tasks with a greater use of industrial communication?
Then, LOGO! 0BA7 devices are a good solution for you. LOGO! 7 Basic
With the basic devices LOGO! 7, you can easily expand old programs by adding functions.

The supplementing of additional I/Os or the integration of user-friendly operator guidance via touch panels is also possible.
LOGO! 7 can be integrated into KNX and AS-I networks.
Five additional function blocks and 400 block program capacity open new applications for the LOGO!.
Data logging on SD cards and creating of your own macro function block libraries is possible.

LOGO! – the proven basic (0BA6)

LOGO! impresses customers due to the wide variety of possible applications and it allows the easy implementation of comprehensive applications up to 200 blocks.
When operating and monitoring, the 4-line backlit display with a maximum of 32 characters per line ensures a high degree of user-friendliness.LOGO! 6 Basic
The message text allows the display of text, set points and actual values, bar graphs, status parameters. Parameters can be
adjusted in the message text.
Flexibility is always assured due to the diverse expansion options including KNX and AS-I connections.
The LOGO! TD text display (4 lines each max 32 characters and 4 additional function keys) allow a very cost efficient monitoring and operation. It can be up to 10 m away from the LOGO!.

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