Siemens S7-300 Operating Instructions Manual page 117

If the setting is disabled during a length measurement, the FM 352 does not update the data.
The MSR_DONE parameter remains reset.
Edge detection
1. Enter a value for the minimum edge distance in the parameter DB. Write and enable
2. Set the "edge detection" function switch. This sets the MSR_DONE parameter.
3. The positive edge at input I1 starts edge detection. The results of the measurement are
4. After the update, FM 352 reports the change by resetting the MSR_DONE parameter.
5. The negative edge at input I1 stops the current measurement. The FM 352 updates the
6. After the update, FM 352 reports the change by setting the MSR_DONE parameter. The
7. The next start of a measurement at the positive edge at I1 resets the MSR_DONE
If the setting is disabled during edge detection, the FM 352 does not update the data. The
MSR_DONE parameter remains reset.
Data used in the channel DB
Address
25.1
34.0
34.2
38.2
112.0
116.0
120.0
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
machine data.
updated and can be read out, and the start value of the measurement is entered; the end
value and length assume the value -1.
data for the end value of the measurement and length.
results of the measurement can be read out.
parameter.
Name
MSR_DONE
EDGE_ON
MSR_ON
MSRRD_EN
BEG_VAL
END_VAL
LEN_VAL
10.7 Executing "Length measurement and edge detection"
Type Start
value
BOOL FALSE 1 = length measurement completed
BOOL FALSE 1 = edge detection on
BOOL FALSE 1 = length measurement on
BOOL FALSE 1 = read measured values
DINT L#0 Start value
DINT L#0 End value
DINT L#0 Length
Settings
Comment
117