By inserting field-installable FlexCard™ modules, users can populate PAX®2C Proportional-Integral-Derivative Controllers in more than 150 configurations to monitor and control multiple application processes on single display. Process Input/Remote Setpoint Cards support input of 0/4–20 mA to enable cascade control loops where tighter control is required. Providing heater current input, Heater Current Monitor Cards can signal when heater or heater control devices have failed before damage occurs.