Data Logging |
The data logging module allows you to run multiple independent data loggers, each configured as a simple periodic logger or as an advanced event-based logger, able to capture information leading up to and following a user defined event. Loggers can have their file names defined by the user or created automatically in a variety of ways. This allows results associated with a batch, shift or particular length of experimental 'run', to be written to disk in easily identifiable files. Data can be written in 'native' format where small data size is critical, or in 'PRN' format allowing it to be imported into most spreadsheets and databases. Logging can be controlled via database points and a useful monitor facility allows the current state of any logger to be viewed at a glance.
A conversion utility allows logged data to be exported in spreadsheet format for advanced analysis externally.
Data from a set of points is logged at intervals for the specified duration, after which the file is closed and a new one opened with a new name. The file name can be automatically 'incremented' until an upper limit is reached, after which the earliest file is overwritten. This flexible facility allows you, for example, to maintain the last week's data consisting of several daily shifts. The file name can be derived from a database point value or descriptor in addition to being a simple text string, allowing for example, batch numbers entered by the operator to be used to identify the log file.
| Log Duration: 1 s to 999 days | Sample interval: 0.1 s to 999 days |
The user can specify a pre-event time and a post-event time, together with the 'event' which will trigger the data capture. The interval at which data is logged is individually programmable for both the pre-event and post-event periods. The event can be defined as a database point exceeding a threshold, changing by more than a certain amount, or entering an alarm condition, or the inverse of those conditions. The points to be monitored for event conditions can be independent of those being logged.
| Pre-event duration: 1 s to 999 days | Pre-event interval 0.1s to 999 days |
| Post-event duration: 1 s to 999 days | Post-event interval: 0.1s to 999 days |
| Trigger types: >=level or <= level, Into alarm or Out of alarm | |