Endress+Hauser Prosonic S FMU90 - Operation; 5.1 Operating options; 5.2 Operation via the display and operating module

The "level" menu
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2.2.6 "LVL N external input 1"
"LVL N external input 2"
(N = 1 or 2)
!
Note!
These parameters are only available for instruments with external limit switches
(FMU90-********B***).
These parameters are used to allocate up to 2 external limit switches to the level channel (e.g. one
minimum safety and one maximum safety switch). If one of these switches gives a signal, the level
assumes a specified value irrespective of the current echo signal.
"input N" (N = 1 or 2)
This parameter allocates an external limit switch to the level channel.
Selection:
• disabled (default)
no switch allocated
• ext. digin 1
external limit switch at the terminals 71, 72, 73
• ext. digin 2
external limit switch at the terminals 74, 75, 76
• ext. digin 3
external limit switch at the terminals 77, 78, 79
• ext. digin 4
external limit switch at the terminals 80, 81, 82
"function"
This parameter determines which value the level assumes if the limit switch sends a signal.
Selection:
• off (default)
no influence on the level value
• Min (0%)
If the limit switch sends a signal, a level value of 0% is generated.
• Max (100%)
If the limit switch sends a signal, a level value of 100% is generated.
• hold
If the limit switch sends a signal, the level is held on its current value.
• customer secific
If the limit switch sends a signal, the level assumes the value as defined by the customer in the
"value" parameter.
"value"
This parameter is only available for "function" = "customer specific".
It determines which value the level assumes if the limit switch sends a signal.
⇒
LVL1 ext. input1 L1020
input 1:
function: