40
15.3 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
FH2
Max. value exceeded → alarm
FL2
Below min. value → alarm
OU2
Window function, normally open (Fno)
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�
