Endress+Hauser Liquisys M CUM253 - Page 51

Liquisys M CUM223/253 Commissioning
Endress+Hauser 51
Constant controller
Via the current output 2, the minimum actuating variable (0 %) of the controller is output
with 0/4 mA and the maximum actuating variable (100%) of the controller is output with
20 mA.
Control characteristic for direct and inverse control action
You can choose between two control characteristics in the R236 field:
• Direct control action = maximum function
• Inverse control action = minimum function
a0008941
Fig. 28: Control characteristic of a proportional controller with direct and inverse control action
ADirect = max. function
B Inverse = min. function
X
W
X
W
–X
W
–X
W
100 %
100 %
Y
Y
A
B