Program Flow Control Instructions in PLC Ladder Logic. are used to control the sequence in which your program is executed.
Different types of instructions are JMP, LBL, JSR, SBR, RET, MCR, TND and SUS.
Control instructions allow you to change the order in which the processor scans a ladder program.
Typically, these instructions are used to
- minimize scan time,
- create a more efficient program,
- troubleshoot a ladder program.