Is it possible to show trend display for a specific time automatically?
Is it possible to show the trend display ( or trend graphic element or high performance trend) for a specific time "automatically" with the specific time stamp and time scope from an OPC items.
For example : Read time stamp and time scope from OPC properties and plot the history value from 20181205 ; 06:00 for 8 hours in my trend display.
I keep the information of several batches in PLC application for instance, some set point and setting parameters, started time and ended time. Process engineer is interested to see the measuring value during the time from the starting of a batch until the batch is ended. ( a bit lazy to change the time manually, hur? :-) )
I can solve the problem with data direct access to get the historydata during that time show in excel but then there are several steps to achieve the result and it has to involve excel too.
Thanks for the tips and answer.
Honestly, that's the answer. It will take you some time to set it up, but for the Process Engineer, its a one button push to open the report that gets scheduled at the end of every batch. Its really just a question of who pushes the buttons .... you or him ;) and once its done, its done. However .....
AFAIK you cant send the start and end times of a trace to the standard Trend Display. But you may be able to build your own trend display using the Chart primitives in PG2. See Appendix A of the Process graphics manual on how to configure these. You can build a display and PLC logic to drive simple batch reports. be careful that it doesn't end up being more work than using Data Direct and the Report Scheduler.