Operating Mode Restriction
Definition
Restricting unauthorized changes to the operating mode prevents devices from switching into inappropriate or vulnerable states during normal use.
How it works
Many OT Controllers use key switches to change the controller into different modes of operation. These modes of operation can include Program, Run, Remote, or Stop.
The key switch should be left in the appropriate key switch position, e.g., run or remote during normal operations.
Implement a key management procedure to include removing the physical key from the key switch when not in use.
Artifact Relationships:
This defensive technique is related to specific artifacts. Click the artifact node for more information.
References
The following references were used to develop the Operating Mode Restriction knowledge-base article.
(Note: the consideration of references does not imply specific functionality exists in an offering.)