6.6.4 'Extra' 'Auto Read'

With this command the present trace buffer is read automatically from the PLC, and the values are continuously displayed.

If the trace buffer is automatically read, then a check ( ) is located before the menu item.

6.6.5 'Extra' 'Stop Trace'

Symbol:

This command stops the Sampling Trace in the PLC.

6.6.6 Selection of the Variables to be Displayed

The comboboxes to the right, next to the window for displaying curves trace variables defined in the trace configuration. If a variable is selected from the list, then after the trace buffer has been read the variable will be displayed in the corresponding color (Var 0 green, etc.). Variables can also be selected if curves are already displayed.

A maximum of up to eight variables can be observed simultaneously in the trace window.

6.6.7 Display of the Sampling Trace

x Sampling Trace of Different Variables

If a trace buffer is loaded, then the values of all variables to be displayed will be read out and displayed. If no scan frequency has been set, then the X axis will be inscribed with the continuous number of the traced value. The status indicator of the trace window (first line) indicates whether the trace buffer is full and when the trace is completed.

If a value for the scan frequency was specified, then the x axis will specify the time of the traced value. The time is assigned to the "oldest" traced value. In the example, e.g., the values for the last 25 seconds are indicated.

The Y axis is inscribed with values in the appropriate data type. The scaling is laid out in a way that allows the lowest and the highest value to fit in the viewing area. In the example, Var 0 has taken on the lowest value of 6, and the highest value of 100: hence the setting of the scale at the left edge.

If the trigger requirement is met, then a vertical dotted line is displayed at the interface between the values before and after the appearance of the trigger requirement.

A memory that has been read will be preserved until you change the project or leave the system.

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236 • Overview of the Resources

Sampling Trace

6.6.8 'Extras' 'Cursor Mode'

The easiest way to set a cursor in the monitoring area is to click there with the left mouse button. A cursor appears and can be moved by the mouse. At the top of the monitoring window the current x-position of the cursor is displayed. In the fields next to 'Var 0', 'Var 1', ..., 'Var n' the value of the respective variable is shown.

Another way is the command 'Extras' 'Cursor mode'. With this command two vertical lines will appear in the Sampling Trace. First they are laying one on the other. One of the lines can be moved to the right or to the left by the arrow keys. By pressing <Ctrl>+<left> or <Ctrl>+<right> the speed of the movement can be increased by factor 10.

If additionally the <Shift> key is pressed, the second line can be moved, showing the difference to the first one.

6.6.9 'Extras' 'Multi Channel'

With this command you can alternate between single-channel and multichannel display of the Sampling Trace. In the event of a multi-channel display, there is a check ( ) in front of the menu item.

The multi-channel display has been preset. Here the display window is divided into as many as eight display curves. For each curve the maximum and the minimum value are displayed at the edge.

In a single-channel display, all curves are displayed with the same scaling factor and are superimposed. This can be useful when displaying curve abnormalities.

WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32

6.6.10'Extras' 'Show grid'

With this command you can switch on and off the grid in the graphic window. When the grid is switched on, a check ( ) will appear next to the menu item.

6.6.11'Extras' 'Y Scaling'

With this command you can change the preset Y scaling of a curve in the trace display.

In the dialog box specify the number of the desired curve (Channel) and the new maximum (maximum y scale) and the new minimum value (minimum y scale) on the y axis.

By doubleclicking on a curve you will also be given the dialog box. The channel and the former value are preset.

x Dialog Box for Setting the Y Scale

6.6.12'Extras' 'Stretch'

Symbol:

With this command you can stretch (zoom) the values of the Sampling Trace that are shown. The beginning position is set with the horizontal picture adjustment bar. With repeated stretches that follow one-after-another, the trace section displayed in the window will increasingly shrink in size.

This command is the counterpart to 'Extras' 'Compress'.

6.6.13'Extras' 'Compress'

Symbol:

With this command the values shown for the Sampling Trace are compressed; i.e., after this command you can view the progression of the trace variables within a larger time frame. A multiple execution of the command is possible.

This command is the counterpart to 'Extras' 'Stretch'.

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238 • Overview of the Resources

Sampling Trace

6.6.14'Extras' 'Save Trace'

With this command you can save a Sampling Trace (values + configuration data). The dialog box for saving a file is opened. The file name receives the extension "*.trc".

Be aware, that here you save the traced values as well as the trace configuration, whereas Save trace in the configuration dialog only concerns the configuration data.

The saved Sampling Trace can be loaded again with 'Extras' 'Load Trace'.

6.6.15'Extras' 'Load Trace'

With this command a saved Sampling Trace (traced values + configuration data)can be reloaded. The dialog box for opening a file is opened. Select the desired file with the "*.trc" extension.

With 'Extras' 'Save Trace' you can save a Sampling Trace.

6.6.16'Extras' 'Trace in ASCII-file'

With this command you can save a Sampling Trace in an ASCII-file. The dialog box is opened for saving a file. The file name receives the extension "*.txt". The values are deposited in the file according to the following scheme:

WAGO-I/O-PRO 32 Trace

D:\WAGO-I/O-PRO 32\PROJECTS\TRAFFICSIGNAL.PRO

Cycle PLC_PRG.COUNTER PLC_PRG.LIGHT1

0 2 1

1 2 1

2 2 1

.....

If no frequency scan was set in the trace configuration, then the cycle is located in the first column; that means one value per cycle has been recorded at any given time. In the other respects, the entry here is for the point in time in ms at which the values of the variables have been saved since the Sampling Trace has been run.

In the subsequent columns, the corresponding values of the trace variables are saved. At any given time the values are separated from one another by a blank space.

The appertaining variable names are displayed next to one another in the third line, according to the sequence (PLC_PRG.COUNTER, PLC_PRG.LIGHT1).

WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32