Siemens SINUMERIK 828D Function Manual page 1139

While you look at a status chart, you can also switch the target system into the STOP operating state and only
execute the first or a certain number of cycles in which you monitor program execution.
Note
Please note that you cannot change your chart if the chart status is enabled! Disable the
chart status if you wish to edit the chart.
Opening / enabling a status chart
Opening a status chart is not the same as enabling a status chart. You can open and evaluate or change a status
chart: However, if you do not execute the command "Single read" (in the menu "Test" or in the function bar) or
enable the chart status (in the menu "Test" or in the function bar) no status information will be displayed in the
"Actual value" column.
Figure 14-7 Example of a status chart
"Single read" function
If you use the function "Single read" (this is only available when the chart status is disabled) to evaluate a status
chart, the actual values of the target system are accepted and displayed in the column "Actual value". However,
the values are not updated while the target system executes the program.
"Chart status" function
If you enable the chart status (in the menu "Test" or in the function bar), the actual values of the target system are
regularly updated. If changes are received from the target system, then the column "Actual value" is updated.
"New value" column
You can assign (write) certain values in the target system using the column (new value).
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
P4: PLC for SINUMERIK 828D
14.4 Test and diagnostic functions
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