I tried to change slot numbers, I tried to modified the IP of the CPU as troubleshoots, but nothing helped. I do not find a proper description to setup the communication between S7-300 and Node-RED with Simatic Manager. I know, that in TIA there is additional steps to do, but I want to use Simatic Manager with S7-300 CPU!
What am I doing wrong? Why the CPU is offline?
I only use 1 variable. I tried other as well without any success.
I don't know anything about that node, but the EHOSTUNREACH error generally means that there is a fundamental problem getting to the device via the network.
What is the IP of the device running node-red?
Are they on the same local network?
What hardware/OS is node-red running on?
How was node-red installed? Did you use Docker for example?
Can you access the device from the node-red system using a different client application?