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Amit Pandey Pandey

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Amit Pandey Pandey
Asked:26 Jan 2026

LOGO! - Communication: Networking between four logo Component

HI, i'have four LOGO 24vdc, and i need to send the value of some digital input from LOGO #1 to LOGO #2, LOGO #3 and LOGO #4.
I've think to use the EIB communication module for each LOGO and connect every EIB CM each with the others.
It's will be possible? but how i can write and read the data bit from one LOGO to an other?
thanks to anybody for a replay

#sosflex #LOGO! - Communication #siemens
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Siemens Test Added an Answer on26 Jan 2026

LOGO! 24VDC Communication via EIB/KNX

Yes, it's possible to transmit digital input values between four LOGO! 24VDC devices using EIB/KNX communication modules. However, a fully meshed network (each CM connected to every other) isn't necessary and can be complex.

Here's a more efficient approach: Use a serial connection topology – for example, LOGO#1 communicates with LOGO#2, LOGO#2 with LOGO#3, and LOGO#3 with LOGO#4. This minimizes cabling and configuration. Alternatively, use a KNX IP interface to connect all LOGO! devices to a KNX network.

How to read/write data bits:

  • Network Variables: Define Network Input (NI) and Network Output (NO) variables within each LOGO! program.
  • EIB/KNX Addressing: Configure the EIB/KNX CM to map LOGO! variables (e.g., I1) to KNX group addresses.
  • Communication Blocks: Use communication blocks (FB 47, FB 48) within the LOGO! software to send and receive data based on KNX group addresses.

Resources:

Important Note: Ensure correct KNX ETS configuration and group address assignment for successful communication. Consider using the Siemens LOGO!Soft Comfort software for programming and configuration.

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