11 Description of Device Functions PROline Promag 10
102 Endress+Hauser
11.7.1 Information on the response of the status output
General
If you have configured the status output for “LIMIT VALUE” or “FLOW DIRECTION”, you can configure the
requisite switch points in the ON-VALUE and OFF-VALUE functions. When the measured variable in question
reaches these predefined values, the status output switches as shown in the illustrations below.
Status output configured for flow direction
The value you entered in the function SWITCH-ON POINT defines the switch point for the positive and
negative directions of flow. If, for example, the switch point entered is = 1 m
3
/h, the status output switches off
at –1 m
3
/h (not conductive) and switches on again at +1 m
3
/h (conductive). Set the switch point to 0 if your
process calls for direct switchover (no switching hysteresis). If low flow cut off is used, it is advisable to set
hysteresis to a value greater than or equal to the low flow cut off rate.
Switch-off point/switch-on point
a = Status output conductive
b = Status output not conductive
Status output configured for limit value
The status output switches as soon as the measured variable undershoots or overshoots a defined switch
point.
Application: monitoring flow or process-related boundary conditions.
Measured variable
➀ = ON ≤ SWITCH-OFF POINT (maximum safety)
➁ = ON > SWITCH-OFF POINT (minimum safety)
➂ = Status output switched off (not conductive)
F-xxxxxxx-05-xx-xx-xx-004
t
➀
➂ ➂
➁
F-xxxxxxx-05-xx-xx-xx-005
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