# Siemens S7-1200 via CP1243-1 Additional Ethernet Interface **URL:** \ **Category:** General Discussion\ **Created:** [February 7, 2024, 8:40pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403 "2024-02-07T20:40:30Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![mbturner94](https://avatars.discourse-cdn.com/v4/letter/m/d78d45/32.png) [@mbturner94](https://forum.inductiveautomation.com/u/mbturner94)\ **Post date:** [February 7, 2024, 8:40pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/1 "2024-02-07T20:40:30Z")
Hi, Has anyone connected Ignition to an s7-1200 CPU via a CP1243-1 communications processor and successfully read CPU memory areas? CPU on board Ethernet interface is being used for Profinet distributed IO on a local subnet. CP interface is being used for connection to corporate subnet for programming changes and connection to SCADA. Device has been successfully connected in the Gateway but when creating tags in designer quality is shown as bad. Images of device and tag configuration. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/6/b6c6706b9fc240026cb840eabef116799c08a23b.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/2/f27fce78e27c7c19639e7ef8c7b453769d847531.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/3/337448cc67c349dfa0acb45ec5a16a430392a6a0.png) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [February 7, 2024, 8:46pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/2 "2024-02-07T20:46:28Z")
Did you check these settings in the PLC? [https://docs.inductiveautomation.com/display/DOC81/Siemens#Siemens-Considerationsfor1200and1500Devices](https://docs.inductiveautomation.com/display/DOC81/Siemens#Siemens-Considerationsfor1200and1500Devices) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [February 7, 2024, 8:48pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/3 "2024-02-07T20:48:43Z")
Note that any changes to these settings require you to recompile software _and_ hardware configuration and download both. ---
**Author:** ![mbturner94](https://avatars.discourse-cdn.com/v4/letter/m/d78d45/32.png) [@mbturner94](https://forum.inductiveautomation.com/u/mbturner94)\ **Post date:** [February 7, 2024, 9:29pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/4 "2024-02-07T21:29:56Z")
Thanks for the help. After enabling 'permit access with PUT/GET communication' the tags are reading. ---
**Author:** ![xolo\_0191](https://avatars.discourse-cdn.com/v4/letter/x/ecae2f/32.png) [@xolo\_0191](https://forum.inductiveautomation.com/u/xolo_0191)\ **Post date:** [April 24, 2025, 7:27pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/5 "2025-04-24T19:27:30Z")
Hi, I'm trying to connect an S7 1200 PLC to Ignition software using the CP1243-1. The reasons are the same as yours. However, I don't see the tag communication reflected in Ignition. How did you configure communication between the CP1243-1 and Ignition software? Could you give me an example? Did you use some especial instructions, or was the access done directly through OPC UA on the PLC by CP1243-1? ---
**Author:** ![Cody\_Morgan](https://avatars.discourse-cdn.com/v4/letter/c/db5fbb/32.png) [@Cody\_Morgan](https://forum.inductiveautomation.com/u/Cody_Morgan)\ **Post date:** [April 25, 2025, 3:07am UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/6 "2025-04-25T03:07:31Z")
Hi, have you worked with Ignition before? It sounds like you're fairly new to Ignition, but if not, I apologize for potentially spelling out stuff you may already know. > How did you configure communication between the CP1243-1 and Ignition software? Did you use some especial instructions, or was the access done directly through OPC UA on the PLC by CP1243-1? The original poster in this thread was using the Siemens S7-1200 driver for Ignition. Here is a link to the documentation for this driver: [Siemens | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.1/ignition-modules/opc-ua/opc-ua-drivers/siemens) To put it more succinctly, in order to make this work you must follow a few steps: 1. Configure the PLC to allow PUT/GET access and a few other settings. Compile the software and hardware changes, then download them to the PLC. This is described in this section: [Siemens | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.1/ignition-modules/opc-ua/opc-ua-drivers/siemens#considerations-for-1200-and-1500-devices) 2. Configure a Siemens S7-1200 device connection on the Ignition Gateway 3. Configure tags with the appropriate OPC item path, data type, etc. in the tag browser within the designer. There are a couple of Inductive University video lessons about how to connect to Siemens devices: [Connecting to S7 Devices Video at Inductive University](https://inductiveuniversity.com/videos/connecting-to-s7-devices/8.1) Welcome to the forum! PS- This topic might have been better suited for a new thread ---
**Author:** ![Lucas\_Romano](https://avatars.discourse-cdn.com/v4/letter/l/90ced4/32.png) [@Lucas\_Romano](https://forum.inductiveautomation.com/u/Lucas_Romano)\ **Post date:** [April 28, 2025, 8:33pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-via-cp1243-1-additional-ethernet-interface/85403/7 "2025-04-28T20:33:22Z")
Have you tried changing the CPU slot number? in a 1200 with a CP module If my memory serves me right, the default slot changes