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16.3 Storage tank
Monitoring of the acceptable range (alarm) and level control
Switching output 1: refilling
SP1
upper preset value reached → finish refilling
rP1
below lower preset value → start refilling
ou1
hysteresis function, normally closed (Hnc)
Switching output 2: safety function min - max
SP2
max. value exceeded → alarm
rP2
below min. value → alarm
ou2
window function, normally open (Fno)
FH2
SP1
rP1
FL2
XX.X = display value
A = refill; B = min. monitoring; C = max. monitoring
• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is
reached again, output 1 switches off.
• If the level is below FL2 or above FH2 or if there is a wire break, output 2
switches OFF (→ alarm).
• The logical operation between the outputs 1 and 2 indicates whether there is
overflow or the actual level is below the minimum level.
-Overflow: output 1 and output 2 switched off.
-Below min. value: output 1 switched ON and output 2 switched OFF.