The analog I/O extension module offers two unipolar current (0(4) to 20 mA) or bipolar voltage (+/-0(2) to 0 V or +/-0 to 2 V) inputs and two unipolar current (0(4)-20 mA) outputs. Analog unipolar inputs are 12 bit resolution. Bipolar inputs are 11 bit resolution. Analog outputs are 12 bit resolution. The analog inputs and outputs are galvanically isolated as a group, from each other and the power supply.