RSLogix Studio 5000 JSR JMP LBL Instruction | Navigating Routines PLC Programming Jump Control

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PLC programs are executed sequentially. In other words, the PLC executes a rung before proceeding to the next one. Within a single rung, the PLC will execute each sub-branch before proceeding to the next one. A PLC programmer may choose to navigate between rungs in a non-sequential order as defined by the routine. In other words, using instructions such as JSR, JMP, and LBL allows one to create an order which doesn't follow the rung labels.
We've been using the JSR, or the Jump to Subroutine instruction, in many places of our code. This simple instruction allows the programmer to indicate which routines to execute within a program. As the PLC scans the JSR instruction, it executes the associated subroutine. At the end of the specified subroutine, the PLC returns to the instructions and continues from there.
The JMP and LBL instructions allow one to jump between different rungs within a routine or otherwise. These instructions are simple in nature, but create an environment which may confuse even the most experienced programmers. It's important to understand them in order to avoid troubleshooting complications in PLC systems.
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