Siemens S7-300 - Executing Length Measurement and Edge Detection

Settings
10.7 Executing "Length measurement and edge detection"
FM 352 electronic cam controller
116 Operating Instructions, 05/2011, A5E01071724-03
10.7 Executing "Length measurement and edge detection"
Definition
The "length measurement" and "edge detection" let you determine the length of a part.
Length measurement and edge detection are active and remain active until you disable
these functions or select a different measuring method. If you select both measuring
methods in parallel, FB CAM_CTRL enables length measurement.
Requirement
A bounce-free switch must be connected to input I1.
Sequence of the Settings
Depending on the type of measurement, the FM 352 updates the data on the module at
different times. FM 352 reports each update in a parameter on the checkback interface.
Length measurement
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1. Set the function switch for "length measurement".
2. A positive edge at input I1 starts the length measurement.
3. The negative edge at input I1 stops the current measurement. FM 352 updates the start
value, end value, and length data.
4. When parameter MSR_DONE is set, FM 352 reports the data update. The parameter
indicates completion of the measurement. The results of the measurement can be read
out.
5. The next start of a measurement at the positive edge at I1 resets the MSR_DONE
parameter.