How to communicate between Logo 0BA7 and Node Red

https://community.home-assistant.io/t/anyone-experience-with-siemens-logo-0ba7/446790

HOW TO COMMUNICATE BETWEEN SIEMENS LOGO 0BA7 AND NODE RED

**STEP 1:** Follow this guide: https://flows.nodered.org/flow/272a6d2104474c68f7b0e01bae025ead

But where it says

 * PLC properties (little pencil)
* Change for your IP adress (where red node is intalled)

There is a mistake, this should be the IP address of your Logo. See my examples of configuration that works for me. 192.168.0.2 is the IP of my Logo in this example. Node Red S7 node config:

https://imgur.com/joFAInF

"Name" change to whatever you like, it's just left at the default "S7-LOGO8" here.

LOGO!Soft Comfort  v8.3 config:

https://imgur.com/qKpviP0

Fill in your default gateway IP here if you for some reason want to access the Logo directly from outside of your local network, otherwise i'ts fine to leave it blank, or at least it was in my case.

**STEP 2:** If you followed every step in the Logo 8 guide you will have a list of Logo 8 variables configured in your s7 node. However, these are for Logo 8 and need to be altered for the Logo 7. I won't go into detail on Logo 7 adressing, parameter VM mapping and such but I'll help you along.

As a reference for figuring out the 0BA7 adresses I used this document:

https://docplayer.net/126912375-Application-note-connecting-a-logo-0ba7-0ba8-s7a-driver-v7-51-build-104.html

Here's my list of variables to get you started, this is far from a complete list and it may contain errors since I'm only using some of these myself, but it should get you started. If you save this as a .csv you may be able to import it directly as a file to your variable config.

```
DB1,X942.0;Q01
DB1,X942.1;Q02
DB1,X942.2;Q03
DB1,X942.3;Q04
DB1,X942.4;Q05
DB1,X942.5;Q06
DB1,X942.6;Q07
DB1,X942.7;Q08
DB1,X923.0;I01
DB1,X923.1;I02
DB1,X923.2;I03
DB1,X923.3;I04
DB1,X923.4;I05
DB1,X923.5;I06
DB1,X923.6;I07
DB1,X923.7;I08
DB1,X924.0;I09
DB1,X924.1;I10
DB1,X924.2;I11
DB1,X924.3;I12
DB1,INT926;AI01
DB1,INT928;AI02
DB1,INT944;AQ01
DB1,INT946;AQ02
DB1,X948.0;M01
DB1,X948.1;M02
DB1,X948.2;M03
DB1,X948.3;M04
DB1,X948.4;M05
DB1,X948.5;M06
DB1,X948.6;M07
DB1,X948.7;M08
DB1,X949.0;M09
DB1,X949.1;M10
DB1,X949.2;M11
DB1,X949.3;M12
DB1,X949.4;M13
DB1,X949.5;M14
DB1,X949.6;M15
DB1,X949.7;M16
DB1,X950.0;M17
DB1,X950.1;M18
DB1,X950.2;M19
DB1,X950.3;M20
DB1,X950.4;M21
DB1,X950.5;M22
DB1,X950.6;M23
DB1,X950.7;M24
DB1,X951.0;M25
DB1,X951.1;M26
DB1,X951.2;M27
DB1,INT952;AM1
DB1,INT954;AM2
DB1,INT956;AM3
DB1,INT958;AM4
DB1,INT960;AM5
DB1,INT962;AM6
DB1,INT964;AM7
DB1,INT966;AM8
DB1,INT968;AM9
DB1,INT970;AM10
DB1,INT972;AM11
DB1,INT974;AM12
DB1,INT976;AM13
DB1,INT978;AM14
DB1,INT980;AM15
DB1,INT982;AM16
DB1,B0;VB0
DB1,B1;VB1
DB1,B2;VB2
DB1,B3;VB3
DB1,B4;VB4
DB1,B5;VB5
DB1,B6;VB6
DB1,B7;VB7
```
With boolean values you can use symbolic adressing such as Q0.0, Q0.1 etc but in my example I use the full addresses. With block parameter from the Bxxx blocks such as analog amplifier, PI controller and so forth you have to use parameter VM mapping in LSC. E.g. if you address a "Word" (2 bytes) in LSC to address 0 you use "DB1,B0;VB0" and "DB1,B0;VB0" to catch it in NR. Some tinkering to format these values, e.g. timestamp from a timer is sent in Hex format, was a struggle for me to figure out and format but piece of cake if you are decent with NR (or HA if you prefer to format there). Here's an example of my VM mapping, these translate to VB0..5 in the s7 node (2 bytes per parameter for the "Word" type).

https://imgur.com/HlZqEit

Hope this will be useful for a few people out there, good luck!