Custom Input Ranges - Automation Direct DL405 User Manual

Custom Input Occasionally you may have the need to connect a transmitter with an unusual
signal range. By changing the wiring slightly and adding an external resistor to
Ranges
convert the current to voltage, you can easily adapt this module to meet the
specifications for a transmitter that does not adhere to one of the standard input
ranges. The following diagram shows how this works.
NOTE: Your choice of resistor can affect the accuracy of the module. A resistor that
has $0.1% tolerance and a $50ppm / _C temperature coefficient is
recommended.
NOTE: Remove current jumper in module.
Field wiring
+
50mA Current
Transmitter
–
V
max
R =
I
max
R = value of external resistor
V = high limit of selected voltage range (5V or 10V)
max
I = maximum current supplied by the transmitter
max
Example: current transmitter capable of 50mA, 0 – 10V range selected.
10V
R = 200 ohms
R =
50mA
F4–16AD–2 16-Channel Analog Input
Module internal circuitry
IN
0V
R
7–7
Analog switch