PLC Programming With Ladder Logic > Special Instructions

Bit Shift Left and Right in Ladder Logic

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You might have heard about the bit shift operation before, but did you know that there are two different types? Bit shift Left and Right are used to perform the same operations, but they work with different bit positions.
Bit Shift Operation: Bit Shift Left or Bit Shift Right

A bit shift function is a simple but powerful idea of how to encode information in binary. The shift number may be one or more bits, and the result of the operation is always a series of bits. In ladder logic, it's used to represent an index Bit shift functions are commonly used in Ladder Logic for encoding information into different numbers. They are also used as index values in sequences such as a 1-based sequence or 0-based sequence. The following charts demonstrate how these functions can be created using Ladder Logic

The bit shift left and right in Ladder Logic is used to move the data between the sets.
When we want to move data from sets A and B, we first use the bit shift left and then the bit shift right. In this example, we are shifting four bits to the right.

In Ladder Logic, the order of operations is by default from left to right. However, you can bit shift the order of operations by prefixing a 'B' character in front of one of the operators.

  • In this example, we see that BSHIFT is before BLOCK
  • BBLOCK is before BSHIFT
  • BSHIFT is after BLOCK
  • BAND is after BSHIF
#BBD0E0 »

The bit shift left and right are often used in computer programming to shift the value of a single bit left or right by 1.
Why do you use the bit shift left and right?
This question is easy to answer. Sometimes people use it for internal calculations when they only need one instruction. Sometimes it's used for processing multimedia files such as images and audio, even though this is not explicitly necessary in the code. Some programmers might also use it just because they have forgotten what their algorithm does, or they are still trying to figure out how to fix their bug.

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Course Content

  1. Introduction to PLC Programming
    3m 49s

  1. How to do PLC Programming using Ladder Logic
    15m 14s
  2. Installation of RSLogix Micro Starter Lite
    12m
  3. Elements of RSLogix Micro Starter Lite
    15m 32s

  1. How to Programme and Run the Logic
    19m 14s
  2. PLC Programming of OR Logic Gate
    8m 24s
  3. PLC Programming of AND and NOT Logic Gate
    12m 48s
  4. PLC Programming of NAND,NOR and XOR Logic Gate
    16m 28s

  1. Ladder Logic of Push Button Latching
    14m 16s
  2. Ladder Logic of Interlock Circuit
    21m 25s
  3. Trick to Optimize Use of I-O in Ladder Logic
    5m 33s
  4. Ladder Programming of Motor Operation
    13m 58s
  5. Ladder Logic of Motor Forward Reverse Interlock Protection
    20m 35s

  1. How to Use Timer in Ladder Logic
    17m 39s
  2. On Delay Timer in Ladder Diagram
    8m 39s
  3. Off Delay Timer in Ladder Diagram
    11m 15s
  4. Retentive Timer in Ladder Diagram
    12m 11s
  5. Star to Delta Motor Starter in Ladder Logic
    28m 2s
  6. Counter-up with On Delay Timer Logic
    9m 2s
  7. Countdown with Reset Function in Ladder Logic
    12m 31s
  8. Up-Down Counter Logic with Application in Ladder Logic
    9m

  1. Comparator LIM Block in Ladder Logic
    7m 35s
  2. Comparator EQU,LES,LEQ,NEQ,GRT and GEQ Block in Ladder Logic
    19m 34s
  3. Math Operations in Logic
    30m 16s
  4. Move Blocks in Ladder Logic
    10m 3s
  5. Logical Gate Blocks in Ladder Logic
    22m 5s

  1. Decimal - BCD Conversions in Ladder Logic
    15m 41s
  2. Bit Shift Left and Right in Ladder Logic
    14m 1s
  3. Scale Parameters
    20m 41s
  4. Hacks for Ladder Logic
    10m 11s

  1. Water Tank Filling Control Logic
    27m 57s
  2. Chemical Mixing Process Logic
    33m 11s
  3. Traffic Light Signal Control Logic Part - 1
    23m 41s
  4. Traffic Light Signal Control Logic Part - 2
    36m 46s
  5. Elevator Control Logic
    01h 9m 40s

  1. Assignment of PLC Programming With Ladder Logic
    3m 16s

  1. Interview Questions
    7m 9s

  1. Career Guideline
    2m 42s
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