Festo CMMT-ST-SW, Original Instructions Manual

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9.5 Recording measuring data (trace)
Recording measuring data is a proven means of helping with the diagnostics. The device firmware sup-
ports the recording of all of the data in the parameters directory of the device. Various measuring data
can be recorded simultaneously. The device firmware supplies several channels for this purpose. The
number of available channels and amount of data to be recorded is dependent on the firmware and
software being used. The plug-in, for example, enables the configuration of measuring data and dis-
play of 8 channels.
In addition to selecting the measured values, the sampling interval, trigger signal, trigger event and
trigger type can be configured. By saving the parameter set, the measuring data configuration is saved
in the parameter directory of the device. The device then waits for a trigger event and records the data
independently. Once a connection has been established with the plug-in, there is an option to read out
the data. The implemented configuration applies equally to all channels. A distinction is made
between the following trigger types:
Trigger types Description
Data trigger Trigger type that can use all of the data in the parameter directory of the
device as a trigger signal. For example, a data trigger on the "Setpoint
value speed controller" parameter can start creating a record when the cal-
culated setpoint exceeds a certain value.
Diagnostics trigger Trigger type that can use a diagnostic event as a trigger signal thus
enabling data before and after a diagnostic event to be recorded. Often,
only the period of time just before and just after the error has occurred are
important for the diagnostics.
Tab. 429 Trigger types
After a recording has started, the measuring data is recorded in the trace memory (ring memory).
When the trigger event occurs, the measuring data is not retained on the device upon expiry of the
recording. The data is lost when a new recording is started and when the power supply is switched off.
Parameters
ID Px. Parameters Description
Determines whether the channel is activated or not. If the chan-
nel is activated, the assigned measured value is permanently
recorded in the ring memory after the recording has been star-
ted. The array ID is used for the channel assignment.
This means:
–
1 = Channel activated
– 0 = Channel not activated
5500.0.0: channel 0
…
5500.0.n: channel n
5500 Trace channel
Access read/write
Diagnostics and fault clearance
498 Festo — CMMT-ST-SW — 2019-02