Can you monitor an OT network without affecting PLCs?
Yes, with passive monitoring: the sensor reads a copy of the traffic from a SPANSPAN: switch port analyser. A switch setting that sends a copy of network traffic to one port, where a sensor can watch it. port or TAPTAP: test access point. A small device that copies the traffic on a network cable for a sensor to watch. and never sends anything to the controllers. NetSenX works this way from the Pro plan, and never actively probes devices classified as OTOT: operational technology. The computers that run machines, production lines, building systems and utilities..
This answer also appears, with more context, here: OT network monitoring
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Terms used here
- SPAN (switch port analyser)
- A switch setting that sends a copy of network traffic to one port, where a sensor can watch it.
- TAP (test access point)
- A small device that copies the traffic on a network cable for a sensor to watch.
- OT (operational technology)
- The computers that run machines, production lines, building systems and utilities.