5604 Input/Output (I/O) Module - Hardware Manual
October 19, 2007
6.2 Voltage Outputs
To obtain voltage outputs, connect a load resistor as shown in Figure 9: Analog Output Wiring
above. Connect the voltage device across the load resistor. The table below list resistance values and
output range settings for common voltage ranges. The resistance value listed is the parallel
resistance of the device and the load resistor.
6.3 Range and Resolution
The optional analog output module installed on the 5604 I/O Module has a 12-bit, unipolar, digital
to analog (D/A) converter. These analog outputs can be configured for a 0% (0-20mA) or 20% (4-
20mA) range. There are 4096 D/A counts in the output signal range and one D/A count represents a
value of 8 raw counts. Raw counts are displayed or issued from the application program.
The 0-20mA output range resolution is 4.88µA/count, such that 8 raw counts represent 4.88 µA.
For a 0% offset, use the following relationship to determine the output current based on your raw
counts:
Output Current [mA] = (20 * Raw Count) / 32760
For a 20% offset, use the following relationship:
Output Current [mA] = ( (16 * Raw Count) / 32760 ) + 4
The table below shows the output current for several raw counts, when the analog output is
configured for a 0% and 20% offset.
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