Machine State Log
The machine status report describes the condition of a machine, station, or line at a specific point in time or over a period of time. It is required for condition analysis, availability, and OEE.
States can be derived directly from PLC signals or from multiple signals. It is important that the states are unambiguous in technical terms and can be grouped for key performance indicators.
Typical conditions:
PRODUCINGRUNNINGFAULTIDLEMAINTENANCESTOPPEDUNKNOWN
A simple log might look like this:
timestamp: 1712052000000
assetId: line-1
state: PRODUCING
stateGroup: productive
source: plc-status-word
For OEE, it is crucial to determine which states are classified as planned production time, unplanned downtime, or unevaluated time. This classification should be included in the project-wide key performance indicator definition.