LOGO! communication modules

Logikmodul LOGO!


Network project

Although LOGO! was mainly designed to replace conventional switching technology, LOGO! offers interesting communication options via the Ethernet ports.

Integrated communication

LOGO! Ethernet LAN Port

Ethernet opens up completely new communication options based on TCP/IP by using the SIMATIC S7 protocol:

  • LOGO! modules with each other

  • LOGO! with all SIMATIC S7 controllers

  • LOGO! with SIMATIC HMI devices and TDE

  • LOGO! with communication modules

Additional protocols:

  • LOGO! with third party devices via Modbus TCP/IP (client and server)

  • LOGO! with NTP time server (client and server)

All basic units with Ethernet port can be operated on WLAN via corresponding access points. This means they can be programmed, monitored and controlled remotely.

Two integrated web server – it couldn’t be easier

The integrated web server in all LOGO! 8 basic modules based on message text, as well as the customized web server, are used for monitoring and control the LOGO! via WLAN and the Internet.

You can increase the number of Ethernet ports with the LOGO! CSM.
This Ethernet 4-port switch allows to set up cost-efficient, small local Ethernet networks.

Communication via communication modules

The LOGO! family offers several communication modules for the communication with external systems.
Between LOGO! 8 and communication modules the connection is done exclusively via Ethernet.

LOGO! Communication modules

CMR 2020 / CMR 2040

CSM 12/24V

CSM 230V (in LOGO! 7 design)

CMK 2000 (KNX)

LOGO! CMR communication module

The CMR (Communication Module Radio) for LOGO! 8 has 3 typical areas of application:
1. Communication with LOGO! 8 via SMS (GSM) for alarms, process monitoring and control directly from the mobile terminal unit
2. GPS position detection
3. Time synchronization of LOGO! 8 via NTP server or GPS

LOGO! CMR supports remote communication via the mobile network with LOGO! 8.
This means distributed plants can be monitored and controlled with SMS or alarm messages can be triggered from LOGO!.
Typical applications:

  • Fill level or temperature monitoring, alarms on limit violations

  • Change of setpoints

  • Control of blinds, lights, pumps or irrigation systems, etc. via SMS

  • LOGO! as control unit for clocks in church towers or schools and regular time synchronization

  • Container tracking: Position data and additional information, such as the current temperature values in a container, are queried from the LOGO! station via SMS and transmitted with the LOGO! CMR.

The CMR module offers the following features:

  • Configuration via integrated web interface

  • Up to 20 messages to different groups of recipients

  • Address book with 20 phone numbers

  • Query of specific process values, for example, meter readings, temperature, pressure, etc.

  • Changing of setpoints

  • Stand-alone operation possible

The hardware offers:

  • Slot for SIM card

  • Slot for micro SD card to save the configuration

  • Two integrated inputs and two integrated outputs

  • Connector for a GPS antenna

  • Connector for a GSM antenna

  • DIN rail or wall mounting

The CMR is available in two versions with the same functions.
The CMR 2020 module is suitable for GSM (2G) networks or UMTS (3G) networks.
With LOGO! CMR2040, LOGO! 8 is connected to the latest mobile communications standard of the 4th generation LTE (Long Term Evolution). A fallback function also permits use of the module for the UMTS and GPRS mobile communications standards via GSM.

GSM - Global System for Mobile Communications
UMTS - Universal Mobile Telecommunications System
GPRS - General Packet Radio Service
LTE - Long Term Evolution

Note: For use of the LOGO! CMR2020 and CMR2040 communication modules, country-specific mobile network approvals must be strictly observed:

A SIM card with cell phone contract is mandatory for SMS operation.
Sufficient coverage of the selected cellular service provider has to be checked at the operating site of the LOGO! / CMR module.

CSM Compact Switch Module

With the LOGO! CSM 230 and LOGO! CMS 12/24 compact switch modules, LOGO! 8 units can be supplemented with additional Ethernet ports and Ethernet networks can be set up flexibly with 10/100 Mbps in line, tree, or star topology.

The design of the switch modules has been adapted to the LOGO! series for installation in building cabinets, enabling seamless and space-saving installation. One port can be accessed from the front without having to remove the covers. The unmanaged switches can either connect several logic modules to each other, or they offer connections for additional components such as control and monitoring devices, displays, or programming devices (PG). The advantage of unmanaged switches is plug and play, which means they can be used without in-depth IT expertise.

  • 4-port unmanaged switch

  • CSM 12/24 for 12/24 V DC supply voltage

  • CSM 230 for 230 V AC/DC supply voltage (old design)

  • Power supply via terminal strip connections

  • Diagnostics LEDs

Communication module CMK 2000

For communication in building automation CMK 2000 offers acces for LOGO! 8.

One LOGO! can thus be integrated into a KNX system as intelligent controller via the KNX building bus system.
The CMK 2000 transforms the typical PLC signals (binary or analog) into KNX telegrams for communication with other KNX actuators.
In the opposite direction, it reads the KNX telegrams and sets the corresponding signal levels for the LOGO!.
Signals that are acquired via the standard LOGO! inputs are thus efficiently linked with signals from the KNX system (telegrams) by means of logical functions or timing elements. Analog signals can be monitored for limits or setpoints and corresponding manipulated variables for actuators can be output on the LOGO! or the KNX.
This opens new opportunities for Applications like:
Monitoring, access control, heating, ventilation and air conditioning (hvac), lighting, blind control , irrigation up to pump control.
The integrated clock of LOGO! can be used for synchronization with other KNX stations.
The LOGO! can be master or slave of the synchronization.

With the communication module LOGO! CMK 2000 the number of channels that can be used is independent from the configuration level of the LOGO!, i.e. the full LOGO! configuration can be used for KNX. The module communicates via Ethernet with LOGO! 8:

  • Max. 24 DI, 20 DQ, 8 AI and 8 AQ

  • Date and time can be synchronized via KNX

  • beside digital and analog inputs and outputs process values inside the application program are available as communication objects on the KNX

  • Dimming actuators and shutter/blind actuators on the KNX can be controlled in a system-compliant way

  • 50 configurable communication objects are available, the user defines the communication direction and data format himself

Technical Data

Communication modules with Ethernet connection

CMK 2000

Communication Module KNX (CMK)



Communication Module Radio (CMR)

Note: For use of the LOGO! CMR2020 and CMR2040 communication modules, country-specific mobile network approvals must be strictly observed:

CSM 12/24

CSM 230

Compact Switch Module (CSM)