Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 449)

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DMS 3.2 EN 02/2011 TD29 447
The list of the Variables to be traced is initially empty. In order to append a variable
the variable must be entered in the field under the list. Following this, you can use the
Add button or the <Enter> to append the variable to the list. You can also use the
Input Assistant. The use of enumeration variables is possible.
A variable is deleted from the list when you select the variable and then press the
Delete button.
A Boolean or analogue variable (also an enumeration variables) can be entered into
the field Trigger Variable. The input assistance can be used here. The trigger variable
describes the termination condition of the trace.
In Trigger Level you enter the level of an analogue trigger variable at which the trigger
event occurs. You also can use an ENUM constant here. When Trigger edge positive is
selected the trigger event occurs after an ascending edge of the Boolean trigger
variable or when an analogue variable has passed through the trigger level from
below to above. Negative causes triggering after a descending edge or when an
analogue variable went from above to below. Both causes triggering for both
descending and ascending edges or by a positive or negative pass, whereas none does
not initiate a triggering event at all.
Trigger Position is used to set the percentage of the measured value which will be
recorded before the trigger event occurs. If, for example, you enter 25 here then 25 %
of the measured values are shown before the triggering event and 75% afterwards
and then the trace is terminated.
The field Sample Rate is used set the time period between two recordings in
milliseconds resp., if supported by the target system, in microseconds. The default
value "0" means one scanning procedure per cycle.
Select the mode for recalling the recorded values: With Single the Number of the
defined samples are displayed one time. With Continuous the reading of the recording
of the defined number of measured values is initiated anew each time. If, for example,
you enter the number '35' the first display contains the first measured values 1 to 35
and the recording of the next 35 measured values (36-70) will then be automatically
read, etc.. Manual selection is used to read the trace recordings specifically with
'Extras' 'Read trace'.
The recall mode functions independently of whether a trigger variable is set or not. If
no trigger variable is set the trace buffer will be filled with the defined number of
measured values and the buffer contents will be read and displayed on recall.
The button Save is used to store the trace configuration which has been created in a
file. The standard window "File save as" is opened for this purpose.
Stored trace configurations can be retrieved using the button Load. The standard
window "File open" is opened for this purpose.