This counter increments for logical, configuration-level, changes made to the chassis MIB, such as any SNMP set operation to a name string or similar attribute, as opposed to physical hardware changes. Admins use this to detect that someone has modified chassis configuration, useful as a lightweight change-detection mechanism for audit purposes. For example, a rising chLogicalChanges count between two polling intervals would tell an admin that some administrative change was made to the chassis configuration in that window, prompting a closer look at what changed.