Remote monitoring station

in our plant, we have currently 5 different production lines, controlled by different PLC systems. Is there a way to monitor whether each line is running, and tie it to a central office location for supervision to be notified if a line goes down, without going the SCADA route. (Cost prohibitive) Just something simple to activate a light for each line in the office. I could do it with running conduit from each line to a central common PLC, but I'm looking for maybe something wireless? Any suggestions. Just a notification system nothing elaborate. Thanks

You may want to have a look at ****, cosy, Flexy or Netbiter...
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Pudden means e W o n, without the spaces it's a dirty word round here for some reason.

https://www.controlbyweb.com

Scroll down and looks at different examples, peer to peer seems like it might fit what you are looking for. They have a lot of options.

What kind of distances are between the 5 machines?
What is the distance to the office?
When you say wireless, do you want to be able to view the lines on your phone?

http://accautomation.ca/now-you-can-have-robust-data-logging-for-free-part-1/

Regards,