X20 I/O system includes 12.5 mm wide X20ATB312 temperature measurement module and X20AP3161 energy measurement module. Up to 4 IEC 60751-compliant platinum PT100 temperature sensors can be connected to X20ATB312, which offers resistance temperature and direct resistance measurement capabilities. X20AP3161 offers 3 voltage inputs for max of 3x 480 Vac and 4 current inputs for connecting external current transformers with 333 mV output. It measures effective, reactive, and apparent power.