PLC Program Flow and Control Instructions

Explore advanced PLC ladder logic programming instructions, including bit shift left, bit shift right, word shift operations, and subroutine instructions.

Introduction

• PLC program flow and control
• What you should know before watching

1. Bit Shift Register

• Concepts of bits and words
• Bit shift registers intro
• Bit shift register parameters
• BSL instruction (bit shift left)
• BSR instruction (bit shift right)
• BSL instruction demonstration

2. Word Shift Operations

• Word shift operations intro
• First in, first out (FIFO) instruction
• FFL (FIFO load) parameters, part 1
• FFL (FIFO load) parameters, part 2
• FFU (FIFO unload) parameters
• Illustrate FIFO operation: Example
• Illustrate FFL operation, part 1
• Illustrate FFL operation, part 2
• Example program

3. Program Flow Control Instructions

• Intro to program control instructions
• Jump (JMP) to label (LBL) instructions
• Master control rest (MCR) instruction
• Difference between JMP and MCR
• Introduction to subroutines
• Jump to subroutine (JSR) instruction
• Subroutine (SBR) instruction
• Return from subroutine (RET)
• Nested subroutines

Conclusion

• Next steps