BA Systems—Petershvilevej 1—DK-3200 Helsinge—http://www.basystems.dk
12
BAS 918S/929S
Manual
Analog input continued
Note:
It is not recommended to use a reference shared for sensor signals as well as
for Pumps, Valves or Motor loads. Also, current loop analog input signals must have a
dedicated reference connection. Analog inputs configured for voltage measurements may
have common reference.
When connecting 4 x PT1000, 2 x 0/4mA-20mA, 2 x 0/2V-10V minimum 12 wires will be
required.
If one cable is used for analog signals mixed with supply wires for pumps, valves or motors,
it may be necessary to use twisted pair cables to suppress noise. In this case each analog
input must have a specific reference wire twisted with the + analog input wire.
Example, connecting Pressure Transmitter:
PT1000
PT1000
PT1000
PT1000
12 WIRE CABLE
4-20mA
4-20mA
0-10V
0-10V
1
2
3
4
0-10V
4-20mA
0V
24VAC/DC
PRESSURE TRANSMITTER
TERMINALS
AI(X)-
AI(X)+
BAS9XXS CONTROLLER
SUPPLY CONNECTED AT THE
LOAD, TO AVOID DISTURBING
THE ANALOG MEASUREMENT
24V SUPPLY
-
+
