PLC Programming Comparison Instructions EQU Equal
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Comparison instructions (<, =, >) In FX and Q series PLCs, greater than (>), less than (<), and equal to (=) are used to create a comparator program. If the comparing conditions are true, the output of the ladder program becomes also true and turns on. If the comparisons are false, the output is off.
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PLC Data Comparison Instructions The basic comparative operations of "less than" (<), "greater than" (>), "less than or equal to" (≤), "greater than or equal to" (≥), "equal to" (=), and "not equal to" (6=) may be found as a series of "box" instructions in the IEC standard:
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Use the MEQ instruction with caution. Example & Usage of MEQ. Here's a real-world scenario of a MEQ instruction: A Micrologix 1100 Allen Bradley PLC is used to control a process. In rung 0000, a MEQ instruction is used to compare an Integer N7:0 to N7:2. A mask stored in register N7:1 is applied to the operation. The mask N7:1 is set to 0.
Most commonly used relay instructions used in PLC programming are as shown in the table below
The LES, also known as the Less Than, is an instruction used to compare two values against each other. The instruction takes two integers, floats or constants and will return TRUE if the value specified in "Source A" is less than the one in "Source B". The "Source B" operand must be strictly less than the one specified in "Source A".
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Many other PLC instructions are designed to receive and manipulate non-Boolean values such as these to perform useful control functions. The IEC 61131-3 standard specifies a variety of data comparison instructions for comparing two non-Boolean values, and generating Boolean outputs.
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Comparison instructions in PLC are used to test pairs of values to condition the logical continuity of a rung. Thus, comparison instructions would seldom, if ever, be the last instruction on a rung. Table of Contents Types of Comparison Instructions As an example, suppose a LES instruction is presented with two values.
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For a better understanding of these arithmetic instructions in plc programming, let's take an example. Find the flow by the formula given below, In this formula we have d = pipe diameter, pi is a constant, ∆P is the differential pressure and P is the line pressure. d = pipe diameter is fixed that is around 100mm, therefore we are getting.
PLC Programming Comparison Instructions NEQ Not Equal
In this video, we learn the basics and working principles of comparator instructions in the PLC ladder logic. Different types of comparator instructions are.
PLC Programming Comparison Instructions EQU Equal
sivaranjith 1 What are compare instructions? These are input instructions that test the relationship between two values from two different sources. A compare instruction specifically tests the following sources: Source A: a word address. Source B: another word address or constant.
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The EQU, also known as the Equal, instruction is used to compare two values. The EQU instruction is an input instruction which will return TRUE if the two values within "Source A" and "Source B" fields are equal to each other. If that condition is met, the instruction will allow what's on the right of it to execute.
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1. Basic PLC Programming Instructions 2. Time-Based PLC Programming Instructions 2. Counting-Based PLC Programming Instruction 3. Comparison Based PLC Programming Instruction 4. Mathematical PLC Programming Instruction 5. Data Transfer Based PLC Programming Instruction 7. Logical or Bitwise PLC Programming Instruction 8.
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Comparison instructions in PLC are used to test pairs of values to condition the logical continuity of a rung. As an example, suppose a LES instruction is presented with two values. If the first value is less than the second, then the comparison instruction is true.
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The data comparison instruction gets the PLC to compare two data values. Thus it might be to compare a digital value read from some input device with a second value contained in a register.
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Program Logic PLC Input Output List PLC Comparator Programming Logic Description Conclusion Ccomparator in PLC There are two parameter in each block, Source A & Source B -where values are stored. Description of Comparator Blocks : EQU :
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PLC Programming Comparison Instructions Instrumentation Tools 102K subscribers Join Subscribe 3.4K views 1 year ago Omron PLC Course In this video, we will learn the PLC programming.