TERRA-IO用于对TERRACOM设备IO接点的扩充，当TERRA-AMP/EX/IEX等的外部触发干接点logic input和logic output不够时，可采用TERRA-IO来扩充。TERRA-IO有2款型号可选配，分别为TERRA-IO8具备8个logic input和8个logic output输出，TERRA-IO4具备4个logic input和4个logic output输出。
