Establishing communication between IOT2040(Node-Red) and S7-1200 using Putty

General
1

//NODE RED V0.20.7
//NODE JS V14.16.0
//IOT2040 Module - 6ES7 647-0AA00-1YA2
//Putty RELEASE 0.7

While downloading S7 library into IOT2040 when we enter the command npm install node-red-contrib-s7 in Putty, following error is seen-

npm ERR! code EAI_AGAIN
npm ERR! errno EAI_AGAIN
npm ERR! request to https://registry.npmjs.org/node-red-contrib-s7 failed, reason: getaddrinfo EAI_AGAIN proxy.company.com:8080

npm ERR! A complete log of this run can be found in:
npm ERR! /home/root/.npm/_logs/2021-03-30T11_36_16_150Z-debug.log

Kindly help us to resolve the issue,
Thanks in Advance!

2

EAI_AGAIN means the DNS server replied that it cannot currently full fill the request

The device requires internet connection to download / install extra nodes.

Can you ping 8.8.8.8 from inside the putty session?

Can you curl something from the internet? e.g what do you get if you run curl https://flows.nodered.org/node/node-red-contrib-s7 (inside the putty session to the IOT box)?

PS, out of curiosity, how have you got NODE JS V14.16.0 running on an IOT2040 ?
PS2: node-red V0.20.7 is seriously out o date. If you really have nodejs V14 you can run node-red V1.2.9 (current release)

3

Thanks for your reply,

  1. We ping 8.8.8.8 from inside the putty session we are getting response.

  2. When we type curl node-red-contrib-s7 (node) - Node-RED the response is
    Could not resolve host: flows.nodered.org

Refer the Screenshot attached.

Regarding the PS Node JS version is of localhost so it is not concerned here in IOT2040.

Thanks,
Awaiting for your reply.

PUTTY
PUTTY1366×768 60.2 KB

4

so it is definitely a DNS issue - the box can access external resources but cant perform DNS lookups.

PS, this issue has been on the forum several times. A quick search lead me to a post that links to this siemens post

Have you tried that?

5

In which case it is of zero relevance (putty commands are executed on the remote box and the localhost NODEJS version is completely irrelevant)
But thanks for clarifying - siemens dont seem to be supporting their hardware beyond nodejs 8 (or is it v10 - i forget?).

6

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.