Manual
Double Sheet Detector R1000 series UDK20
Communication with the PLC
B0048991 / Rev. 1.3
70
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6.3.1 System test
The System test must be performed before each measuring cycle. During this test no sheet
should be in front of the sensor.
This test serves for detecting the correct function of the unit. Simultaneously all outputs
(also „Enable“) are activated for the duration of the system test. After the test all activated signals
are
reset again.
IN5
OUT0
OUT3
OUT2
OUT1
Systemtest
Enable
0-sheet
1-sheet
2-sheet
1
>30ms
>30ms
<=30ms
<=100ms
4
2
3
5
6
Check whether the output OUT0 „Enable“ has switched to HIGH (ready for operation), otherwise there is a fault
condition.
Before initiating the system test, all inputs must be LOW for >30 ms. No sheet must be in front of the sensor.
Switch the input IN5 „System test" to HIGH.
All outputs have switched to LOW within 30 ms.
Switch the input IN5 „System test" to LOW.
The unit now performs an internal system test. After a maximum time of 100 ms all outputs have switched to HIGH.
If the configuration „measurement internal“ was selected, this check cannot be performed since the unit starts the
measurement cycle automatically. Therefore the mode „measurement external“ must be used.
Example:
Check whether the output OUT0 „Enable“ has switched to HIGH.
No sheet must be in front of the sensor. All inputs must be LOW for more than 30 ms.
Now switch input IN5 to HIGH.
After 30 ms check whether all outputs have switched to LOW.
Now switch input IN5 to LOW.
After 100 ms check whether all outputs have switched to HIGH.