This reports the firmware version running on this specific power module as a plain integer rather than a formatted string, which the vendor's own tooling presumably knows how to decode into a human-readable version number. For fleet consistency audits across a site with many modules, mixing firmware versions across otherwise-identical modules in the same shelf can introduce subtle differences in how each module reports status codes or handles load sharing. An admin planning a firmware upgrade would poll this integer across every module in a shelf first to confirm which ones are already current and which still need the update.