Trout Asset Discovery Without Scanning
Build a live OT asset inventory through passive observation. Never send an active probe to a production PLC, HMI, or safety controller, with zero risk of triggering a fault.
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Active scanning is dangerous in OT: a probe that a modern IT device shrugs off can fault a legacy PLC, HMI, or safety controller. Access Gate builds the inventory the opposite way, by passively observing the traffic already on the network, so it never sends an active probe to a production asset.
As devices communicate, Access Gate identifies each one, what it is, and how it talks, and keeps the inventory live as the network changes. You get a complete, classified asset list, including the fragile and unpatchable devices that scanning tools are too risky to touch, with zero chance of triggering a fault.
What this video covers
- Why active scanning risks faulting legacy PLCs, HMIs, and safety controllers
- How passive observation builds a live inventory with no probes
- What the inventory captures: each device, what it is, and how it talks
- Keeping the inventory current as assets change
Protocol and vendor coverage
Passive discovery reads the industrial protocols on the wire, so it recognizes assets across every protocol and vendor rather than only the ones a scanner fingerprints. That includes Modbus and Modbus TCP, DNP3, OPC UA, EtherNet/IP, PROFINET, Siemens S7, IEC 61850, and MQTT, across 50+ OT and ICS vendors such as Siemens, Rockwell Automation, Schneider Electric, Mitsubishi Electric, and Beckhoff.
Millbrook Machine brought 100% of its IT and OT estate under one policy, including production machines it had not tracked before.
- 100% IT and OT coverage on a single policy
- Foreign-sourced production machines brought under control alongside office systems
- 0 production disruption, deployed alongside running infrastructure
Questions and answers
Can I inventory OT assets without scanning?
Yes. Access Gate discovers assets by passively observing existing network traffic, so it never sends an active probe to a production PLC, HMI, or safety controller, and there is no risk of triggering a fault.
Why is active scanning risky in OT?
Legacy and safety-critical controllers can fault or reset when probed. A scan that is harmless to IT gear can disrupt production or trip a safety system, which is why passive discovery is the safer approach.
Does the inventory stay current?
Yes. Because discovery is continuous and passive, the inventory updates as devices communicate, so it reflects the live state of the network rather than a one-time snapshot.
Product Capabilities
See Access Gate in Your Environment.
The demos show the pattern. A live call shows what it looks like on your network — with your PLCs, your historian, your constraints.