Lenze 9400 - Manual (Page 580)

12 Oscilloscope
12.2 Functional description
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Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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12.2 Functional description
With an online connection to the controller, use the oscilloscope user interface of »Engineer« to set
the trigger condition and the sample rate and select the variables to be recorded.
When the measurement is started, the set parameters are transferred to the controller and checked.
If invalid settings are found, the oscilloscope sends an error. Otherwise, the measurement is started.
With an online connection, the measured controller data are transferred to »Engineer« and
graphically represented on the oscilloscope user interface as soon as the measurement has been
completed.
Recording variable values
The operating system scans the oscilloscope in fixed 1 ms-cycles, i.e. the oscilloscope can record
variable values with a sample rate of max. 1 kHz.
Recording system variable values of the internal motor control
Unlike the variables declared in the application, the system variables of the internal motor control
(MCTRL) can also be recorded with a sample rate higher than 1 kHz.
Recording I/O variable values referring to a task
When selecting the variables to be measured, it is possible to indicate a task reference for the
variables. If the behaviour of a certain task is to be examined, you can indicate the task reference to
exactly record the values valid for the task run-time. The variable values are recorded during the
process output mapping of the task.
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Note!
In the servo operating modes, recordings with a time-based resolution of 31.25 μs and
125 μs are not possible!
In comparison to all other variable values, the system variables of the internal motor
control have a cycle offset of 2 ... 3 ms!
If recordings with sampling frequencies of > 1 kHz are carried out, up to a maximum of
three measured values will be missing at the left and right edges of the oscilloscope
screen. This is only noticeable in the case of very small time deviations
≤ 1 ms / div.
Because of the nature of the system, the absence of the measured values is due to
oversampling.