PLC Programming BSL Instruction - Bit Shift Left Register Ladder Logic RSLogix 500 Example

PLC Programming BSL Instruction - Bit Shift Left Register Ladder Logic RSLogix Studio 5000 Example Tutorial

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The BSL, also known as the bit shift left, is an instruction which will perform a bit shift of a register by inserting a bit at the specified location and moving over every other bit by a single bit. This instruction takes several parameters and is somewhat complex for those who are new to Programmable Logic Controllers (PLCs). However, in this tutorial, I will be walking you through an example of a BSL implementation in order to demystify this instruction and its application.

This instruction is usually found in object based sequential processes where an order of operation needs to be observed. A simple example which comes to mind is a quality defect station which scans every product. As a defect is picked up, the value is stored in a shift register and the product is rejected at the reject station. This sequence is best implemented with a shift register instead of a timer as it will lead to precise rejects from the line every single time.

Full Tutorial: TBD

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