Description of Sensor Parameters
2
0
1
7
-0
6
61
8.6
Sensor Configuration
–
Echo Loss and Error Handling
8.6.1
No Echo
You can use this parameter to confirm whether "Sensor receives no echo" should be classified
as an error or not.
With the default "No error" setting, the sensor not receiving an echo will not be interpreted as
an error. In this instance, the sensor is behaving in terms of its outputs as if an object is at a
maximum distance.
In some applications, normal operation may mean that a sensor should never lose its echo.
However by setting the parameter as "Error," sensor output can be rendered safe should an
error occur. Output behavior in the event of an error is determined via the "Output behavior if an
error occurs" parameter.
8.6.2
Output behavior if an error occurs
You can use this parameter to adjust the behavior of the output in the event of an error.
Possible error cases are:
■
Extremely loud ambient noise in the ultrasonic frequency range of the sensor
■
Hardware error in the sensor electronics
■
Sensor receives no echo (only an error case if "No echo" parameter is set as "Error")
The meaning of the individual parameter values is explained in the following table.
Parameter name
Access
Value range
No echo
Read/write
■
No error
■
Error
Table 8.34
Parameter name
Access
Value range
Output behavior if an error
occurs
–
Switching output
Read/write
■
Freeze
■
Max. distance
■
Closed
■
Open
Output behavior if an error
occurs
–
Analog output
Read/write
■
Freeze
■
Max. distance
■
Replacement value
Table 8.35
Parameter value
Meaning
Freeze
The output retains its last status or value until a new valid measured
value can be determined by the sensor.
Max. distance
In the event of an error, the output behaves as it would when an object
is at a maximum distance from the sensor.
Closed
This setting is only available for switching outputs. It sets the output
status to "Closed" in the event of an error.
