Read Variables OMRON NJ101 or NJ301

Industrial
1

How can I read data from an NJ301 or NJ101 OMRON PLC from node-red?

I am trying to use the "FINS Read" node of https://flows.nodered.org/node/node-red-contrib-omron-fins.

In the GitHub description https://github.com/Steve-Mcl/node-red-contrib-omron-fins says it works for NJ, but when trying to read a variable I get:

"Response is NG! endCode: 2108, endCodeDescription:Write Not Possible: Cannot change."

How should the node and the PLC be configured?
I attach the OMRON configuration. For the NODE-RED I followed the specifications in the webpages

ConfigOMRON_FINS
ConfigOMRON_FINS772×579 28.6 KB

ConfigOMRON_GlobalVar
ConfigOMRON_GlobalVar756×23 1.7 KB

2

show me your connection setup.

Also, refer to the read.me - it shows you the necessary steps to make it work with an NJ/NX

In particular - you need to add global variables with the AT address set.

3

Thank you for your reply,

You can see how the global variable is set in an image of the first message, with address: %E0_9000.

I attach the images of the setup in node-red

FINS_connection
FINS_connection496×635 11.5 KB
FINS_read

4

looks ok :thinking:

Can you answer a few things...

  • can you ping the PLC from the node-red machine?
  • can you verify the IP of your node-red machine is definitely 192.168.250.100?
  • what is the subnet mask of your node-red machine?
  • what is the subnet mask of your PLC?
  • is there a firewall between node-red machine and PLC?
  • are the PLC and SYSMAC Studio projects synchronised?

things to try...
image

things to read...
I helped another user who had similar difficulties setting up in this issue - perhaps that would be some help?

5

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