From the course: PLC Program Flow and Control Instructions
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Bit shift registers intro - Ladder Logic Tutorial
From the course: PLC Program Flow and Control Instructions
Bit shift registers intro
- [Instructor] Bit shift register is an instruction that allows the shifting of bits through a single register or group of registers. Here is an illustration of the basic concept of a bit shift register. You can see a memory allocation for a 16-bit word. A shift pulse or a clock causes each bit in the shift register to move one position to the right in this case. Usually, bit shift registers are used when we want to track, for example, bottles on a status basis, zero or one, on and off. So it's often used in material handling processes where some form of binary information must be synchronized with a moving part on a conveyor. Here's a scenario using a shift register. We have bottles moving along on a conveyor belt. Data is collected using a sensor to track the presence and the absence of bottles. So every time there's a bottle, the sensor outputs a one, otherwise it outputs a zero. This data can then be loaded into a…
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