10_advanced functions docx

Higher Engineering Education Alliance Program Ladder Logic Functions Prepared by: Ngo Van Thuyen Topics and Objectives  Topics:  Program control: Jump function and branching and looping  Subroutines  State diagram techniques  Design examples  Objectives: After this lectures, with reference to the programming manual students can:  Be able to use jump function appropriately  Be able to use subroutines appropriately  Be able to program with state diagram technique Program control - JMP  Allows a parts of a ladder logic diagram to be excluded or included in a program scan If A is true, the program will jump to LBL:01. If A is false the program goes to the next line. Do you remember how to write it with S7-200? Subroutines  Why subroutines?  To divide the program into smaller tasks for easy management  Easy for trouble shooting, program changing  Steps  Create a subroutine  Define input and output of a subroutine  Call a subroutine from a program (main program, other subroutine or an interrupt routine) Program control – JSR, SBR  How does this work? S7-200 notation Main program Subroutine SBR0 State diagram techniques with SBR  State diagram can be used with MCR but SBR can be more effective State diagram techniques (contd)  Can you explain? Main program State diagram techniques (contd) State diagram techniques (contd)  Work in a group of 2 to implement the following state diagram using subroutine . Higher Engineering Education Alliance Program Ladder Logic Functions Prepared by: Ngo Van Thuyen Topics and Objectives  Topics:  Program control: Jump function