PLC

1. vii
List Of Figures
Name Of Figure Page No.
2.1: PLC’s internal architecture----------------------------------------- 4
2.2: Simplified PLC’s structure—------------------------------------- 4
2.3: Basic PLC sections—---------------------------------------------- 5
2.4: Input card connect with external power supply--------------- 7
2.5: Input side internal circuit—---------------------------------------- 7
2.6: output card connected with various loads----------------------- 8
2.7: Output side internal circuit------------------------------------------ 9
2.8: PLC scan cycle----------------------------------------------------- 10
2.9: Function Block Diagram—---------------------------------------- 11
2.10: ladder diagram----------------------------------------------------- 12
3.1: Typical SCADA System------------------------------------------- 15
3.2: First Generation SCADA Architecture—---------------------- 16
3.3: Second Generation SCADA Architecture--------------------- 18
3.4: Third Generation SCADA Architecture------------------------- 19
3.5: Hardware Architecture------------------------------------------- 20
3.6 : Human machine interface---------------------------------------- 22