PLC Programming With Ladder Logic > Comparators & Logic Gates

Comparator LIM Block in Ladder Logic

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The Comparator LIM Block, or CLB, is an intra-procedural control structure that can be used in Ladder Logic to compare two values and do something if one value is greater than the other.

The following is a sample Ladder Logic program with a CLB:

int BinOp(int x, int y) {

CLB comp = x > y ? y : x;

return BinOp((int)(comp), 9);

}

If the result of the comparison is true, anything before it will be executed. If the result of the comparison is false, anything after it will be executed.

The Comparator LIM Block in Ladder Logic is used to check the input values from the previous block and set the output of the current block depending on those values.

In this tutorial, we will use a comparator block to find out which of two numbers is larger.

First, we will define our variables X1 and X2 as numbers that we want to compare. Then, we will create a value for each variable by writing a formula for each variable on their respective lines below the label "Input 1", using Division (/) or Modulo (%):

X1 = x

X2 = y

Output if X1 is larger than X2:

If both values are greater than 0, then output True. Otherwise, output False

The Comparator LIM Block in Ladder Logic is a block that compares the input to a reference value. The block can be used with both single and multiple inputs.
The Comparator LIM Block in Ladder Logic is a block that compares the input to a reference value. The block can be used with both single and multiple inputs. It has two modes: current mode, which compares the input to the current output of another block, and previous mode, which compares the input to the previous output of another block.
The Comparator LIM Block in Ladder Logic can be used by itself or together with other blocks like AND, OR, NOT, NAND gates, etc.

The Comparator LIM block is a building block in Ladder Logic that can be used to determine if the current input is greater than or less than the previous input. It provides an alternative to using a traditional AND gate.
An example of an application for this block is when you need to compare two inputs and take action when either one is greater than or less than the other. For instance, you could use this block to output a signal that lights up red if one of two inputs is greater than the other, green otherwise.

This block is made to work with the Comparator that is available in the Fusion 360 software. It can be used for both structural and cosmetic analysis of a design.
Fusion 360’s comparative blocks are used for structural or cosmetic analyses. The Comparator LIM Block allows you to compare two different parts from separate views and also show the changes that occur on both views so that you have a better understanding of how one part affects another.

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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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