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Operating Mode Monitoring

Definition

Detects operating modes such as Program, Run, Remote, or Stop.

How it works

Many OT Controllers have key switches to change the controller into various modes of operation. These modes of operation can include Program, Run, Remote, or Stop.

The key switch position is often available as a system diagnostic function block of the programming logic.

Considerations

It is advised to configure a key switch alarm such that an operator is alerted when the controller is put into a programming mode, as this could indicate unintentional or malicious changes to operational code.

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References

All

Internet Article

The following references were used to develop the Operating Mode Monitoring knowledge-base article.

(Note: the consideration of references does not imply specific functionality exists in an offering.)

Value of PLC Key Switch Monitoring to Keep Critical Systems More Secure

Reference Type: Internet Article Author: DRAGOS

Source:

https://www.dragos.com/blog/industry-news/value-of-plc-key-switch-monitoring/

TRITON Malware Remains Threat to Global Critical Infrastructure Industrial Control Systems (ICS)

Reference Type: Internet Article Author: FBI

Source:

https://www.ic3.gov/CSA/2022/220325.pdf

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