... control logic, it is free too!1.6 General-utility I/O port technology, AI and DI,AO and DO can exchange, AI ... ,30%~50% saving cost than others.1.10 PDDC3026 DDC I/O ports : AI(temperature*4,0-10VDC*4),DI*6,AO ... *4,DO*8.1.11 PDDC3026 ExtendI/O ports: AI(temperature*4,0-10VDC*4),DI*8,AO ...