43
Passive 4-20 mA Analog Output
A 12-bit DAC is used along with a current loop transmitter. Since the output is passive, you will need
an external 24 VDC power supply. You can get the output through pins 2 and 3 of the D-SUB9
connector. Pin 2 is AA and pin 3 is BB.
Here is a working connection diagram used at the factory to test:
+
24 VDC
R = 250 ohms
L
I
L
AA
BB
NOTE 1: In your application, substitute the actual input device for R
L
. If your input device is
polarized, connect the common lead to the negative lead of the 24 VDC power supply and the
positive lead to the BB wire.
NOTE 2: The AA and BB wires are not polarized. You may connect them in any manner you wish.
Here is a suggested connection diagram for a PLC:
+24 VDC
R
L
I
L
AA
BB
+
TI-500
PLC
GND
-
NOTE 1: Do NOT connect the indicator ground to the PLC ground.
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