Analog I/O Modules Calibration
4.Issue the Analog Data Out command to the module with an output value of 4 mA.
5.Check the actual output value at the modules terminals. If this does not equal 4 mA, use the "Trim" option in the "Calibrate" submenu to change the actual output. Trim the module until the mA meter indicates exactly 4 mA, or in case of a voltage meter with shunt resistor, the meter indicates exactly 1 V. (When calibrating for 20 mA using a voltage meter and shunt resistor, the correct voltage should be 5 V.)
6.Issue the 4 mA Calibration command to indicate that the output is calibrated and to store the calibration parameters in the module's EEPROM.
7.Execute an Analog Data Out command with an output value of 20 mA. The module's output will be approximately 20 mA.
8.Execute the Trim Calibration command as often as necessary until the output current is equal to exactly 20 mA.
9.Execute the 20 mA Calibration command to indicate that the present output is exactly 20 mA. The analog output module will store its calibration parameters in the unit's EEPROM.