How to Work DIFD or PLF With Scan PLC :
Scan 1 :
Input 0000 = OFF , DIFD 1000 = OFF , Input 1000 = OFF , And Output 0500 = OFF

Scan 2 :
Input 0000 = ON , DIFD 1000 = OFF , Input 1000 = OFF , And Output 0500 = OFF

Scan 3 :
Input 0000 = OFF , DIFD 1000 = ON , Input 1000 = ON , And Output 0500 = ON

Scan 4 :
Input 0000 = OFF , DIFD 1000 = OFF , Input 1000 = OFF , And Output 0500 = OFF

See Animation DIFD PLC or PLF PLC
Please Download for see Animation DIFD PLC or PLF PLC :
Simulator DIFD PLC or PLF PLC