# Can you monitor an OT network without affecting PLCs?

Yes, with passive monitoring: the sensor reads a copy of the traffic from a SPAN port or TAP and never sends anything to the controllers. NetSenX works this way from the Pro plan, and never actively probes devices classified as OT.

FAQ: [OT and IoT](https://netsenx.com/en/faq/ot) · https://netsenx.com/en/faq/can-you-monitor-an-ot-network-without-affecting-plcs

## Read next

- https://netsenx.com/en/ot-network-monitoring
- https://netsenx.com/en/compare

## Related questions

- [Which industrial protocols does NetSenX read?](https://netsenx.com/en/faq/which-industrial-protocols-does-netsenx-read)
- [Do I need a hardware appliance on every site?](https://netsenx.com/en/faq/do-i-need-a-hardware-appliance-on-every-site)
- [Does NIS2 cover OT networks?](https://netsenx.com/en/faq/does-nis2-cover-ot-networks)
- [Can network monitoring break our PLCs?](https://netsenx.com/en/faq/can-network-monitoring-break-plcs)
- [Do IoT devices such as cameras and printers need monitoring?](https://netsenx.com/en/faq/do-iot-devices-need-monitoring)