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CHAPTER 5
Data Trace/Time Chart Monitor Component
This chapter describes the Data Trace/Time Chart Monitor component and its ability to display either the PLCs
uploaded data trace buffer or monitored data obtained from the PLC's memory areas during program execution.
Data held in a PLC's memory areas can be monitored and traced during program execution. When displayed, this
information provides a valuable tool for analysing the program's performance.
The Data Trace/Time Chart Monitor component has two separate modes of operation:
♦ Data Trace. The PLC can be configured to trace a number of channels and bits and can sample these when a
trigger condition is activated. When the PLC trace buffer is full or the user stops the trace, the trace buffer can
be uploaded and viewed – the trace however, is complete. Values do not change on the screen, all sampling is
achieved in the PLC and displayed when finished.
♦ Time Chart Monitor. A number of channels and bits can be configured and monitored online. The changing
values are displayed in the monitoring view as either a trend graph or histogram. A trigger condition can also
be set which resets the sampled amount of data. Monitoring continues until stopped by the user.
With the CX-Programmer version 6.0 and later versions, data collected by the Data Trace and Time Chart Monitor
functions can be saved in standard CSV files (with .csv filename extension). The data saved in standard CSV files
can be analysed and printed in programs such as Microsoft Excel.
The status bar provides instant help, the PLC and CPU type, the current operating mode of the PLC and the status
of the Data Trace/Time Chart Monitor component.
The Toolbar and status bar can both be turned on or off. Select Status Bar from the View menu to control the
display of the status bar. Select Toolbar from the View menu to control the display of the Data Trace/Time Chart
Monitor toolbar.
The Data Trace/Time Chart Monitor component can be forced to stay as the top window by selecting the Always
on top option from the Options menu.
For moving, resizing, maximising, minimising and closing windows, refer to Microsoft Windows online help.
Access to the Data Trace/Time Chart Monitor dialog is from the invoking application.
To close the Data Trace/Time Chart Monitor dialog, select the Close button in the title bar.
Continuous Trace function for CJ2 CPU Units Only
Saving the result of Data Trace to a personal computer enables continuous and long operation on CJ2 CPU Unit.
CPU Unit reads the status of specified bit or the present value of specified channel according to the sampling
conditions and save it to Trace Memory in CPU Unit. CX-Programmer reads the data stored in CPU Unit and
display it on the monitor in Time Chart format. CX-Programmer continues to partially read the contents of Trace
Memory and display them on the monitor till Trace Memory on CPU Unit becomes full. Collecting the data of
longer period is possible.
Note:
This functionality is not supported for CP1E CPU Units.
CHAPTER 5 – Data Trace/Time Chart Monitor Component
PART 2: CX-Server PLC Tools
CX-Server PLC Tools_Page 49
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