Can NetSenX block a dangerous command to a PLC?

No. NetSenX listens to a copy of the traffic and informs your engineers; it does not sit in the path, so it cannot drop a packet, and it never acts on the process. That is intentional: an inline device that blocks industrial commands can stop a line by mistake, and NetSenX is not a safety system. Protection against dangerous commands comes from other layers: a firewall between zones that allows only named hosts, write protection and key switches on the controllers, and a safety instrumented system that does not depend on the control network. What NetSenX adds, from the Pro plan, is the alert when a host that should not write does, when a controller receives an S7comm command such as a stop, or when OTOT: operational technology. The computers that run machines, production lines, building systems and utilities. traffic appears at night, so that someone can check before the next shift starts.

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