ARI Armaturen RI21 EN - Manual (Page 18)

6.3 Type of control signal
The selection of the required control signal, is done by
switch SY.
Switch Type of control
signal clamp connection at:
YU Voltage signal 
max. 10 V DC 
for e.g. 0-10V
YU und GND
YI Current signal 
max. 20mA DC 
for e.g. 4-20mA
YI und GND
Fig. 10: Effective direction
Fig. 11
NORM:
INV:
Example: Control signal
max. 10V 20mA
min. 0V 4mA
Example: Control signal
min. 0V 4mA
max. 10V 20mA
Control signal
NORM INV
max. min.
min. max.
: Effective direction
Page 2-18 Rev. 0040602000 1014
Operating and installation instructions 
Electronic position indicator RI21