Data Value to Output Conversion Chart
The B872 accepts data values ranging from 0000 to 4095 and converts them into output currents of 4 to 20 mA. The output current is directly proportional to the data value plus 4 mA. Refer to the figure below for a data value to output conversion chart.
Determining Data value or Output Current
To determine either the data value or the output current, use the following calculations:
To solve for output current:
Current = (Data Value / 256) + 4
For example:
Current = (3162 / 256) + 4
Current = (12.35156) + 4
Current = 16.35156
Current = 16.352
To solve for data value:
Data Value = (Current - 4) x 256
For example:
Data Value = (10.402 - 4) x 256
Data Value = (6.402) x 256
Data Value = 1638.912
Data Value = 1639
NOTE: Data values larger than 4095 will result in currents less than 20 mA. Refer to the in this chapter. The equations above are valid for data values of 0-4095 only. The module can output values in the range of 4096-8191 in a offset scale. If you use this offset range, be sure to subtract 4096 from the calculations provided above.
Trim-Pots Location and Voltmeter Connections 
