Mr robot season 4 killing the lights

In Mr robot season 4 episode 5 during a kind of heist Eliot catches a glimpse of a sticker that says that some of the infrastructure is control by a certain PLC. After that he logs into the PLC's controller page and sets the lights off timer to the current time so he could escape.

I was wondering how could he have found the PLC's page?

Having used nmap I know that you can see some services running on the devices in a network. What service/OS/other data would make it obvious that a certain IP in the network is the PLC's controller page?

submitted by /u/RandomThrowaway372
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from hacking: security in practice https://ift.tt/2WU8pJr

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