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8--9
F3--04DAS 4-Channel Isolated Analog Output
You cannot connect the current outputs in series (like the voltage outputs) but you
can achieve unusual ranges with a few wiring and programming tricks. For example,
let’s say an application requires a
?
20 mA range. By completing the following steps,
you could easily accommodate this requirement.
1. Configure channel 1 and channel 2 for 0--20mA.
2. Connect the +I of channel 1 to the --I of channel 2.
3. Connect the --I of channel 1 to the +I of channel 2.
4. Send 0 (digital value) to channel 2 while you send 0--4095 (digital value) to
channel 1. To reverse the power flow, send 0 to channel 1 while you send
the 0--4095 value to channel 2. (See the section on Writing the Control
Program for information on sending data values.)
WARNING: The is15 VDC power supplies are rated at a maximum of 20
mA. Current ratings that exceed 20 mA will damage the module beyond repair.
For example, if you used the 0--10 VDC range for the example, the current
would approach 40 mA which would cause damage to the module.
0--470 ohm
User Load
+/-- 20mA
+I
CH1
--I
+I
CH2
--I
0--20mA
CH1 & 2
are configured
for 0--20mA
0--20mA
Combining Current
Outputs