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Reading: How to use Converters in PLC
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Inst Tools > Blog > PLC Tutorials > How to use Converters in PLC

How to use Converters in PLC

Last updated: March 4, 2021 3:27 pm
Editorial Staff
PLC Tutorials
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To study the working of Converter (BCD TO INT/ INT TO BCD) in Allen Bradley programmable logic controllers (plc).

Contents
Integer to BCD Converter Block DiagramBCD to Integer Converter Block DiagramINTEGER TO BCD CONVERTERExample PLC Program: BCD TO INTEGER CONVERTER Example PLC Program: Conclusion:

Integer to BCD Converter Block Diagram

Integer to BCD Converter Instruction in PLC

Block Name : TOD (Integer to BCD Converter )

In the above picture, there are totally two parameter,

SOURCE – Integer Value address

DESTINATION – BCD Value address

BCD to Integer Converter Block Diagram

BCD to Integer Converter Instruction in PLC

Block Name: FRD (BCD to Integer Converter )

In the above picture, there are totally two parameter,

SOURCE – BCD Value address

DESTINATION – Integer Value address

INTEGER TO BCD CONVERTER

In Allen Bradley RS500 Ladder logic, Integer to BCD converter block is called as TOD.

It will convert the integer to respective BCD Value

Ex:

Integer-1020

BCD– 0001-0000-0010-0000

Example PLC Program:

PLC Program for BCD Conversion

Rung 0000 :

I:0/0 giving input condition to BCD converter. When it goes ON, value placed in N7:0 is converter into BCD and store the value in B3:0.

Rung 0001 :

Equal comparator block is used to give output to O:0/0 when B3:0 equals B3:1.O:0/0 is enabled because B3:0 and B3:1 are 0.

PLC Conversion Program
PLC Data File for Integer
PLC Data File for Binary

Rung 0000 :

I:0/0 giving input condition to BCD converter. When it goes ON, value placed in N7:0-1926 is converter into BCD (0001100100100110) and store the value in B3:0.

Rung 0001 :

Equal comparator block is used to give output to O:0/0 when B3:0 equals B3:1.

O:0/0 is turned off  because B3:0 and B3:1 are not equal..

 BCD TO INTEGER CONVERTER

In Allen Bradley RS500 Ladder logic,  BCD to Integer  converter block is called as FRD.

It will convert the BCD to respective Integer Value

Ex:

BCD– 1001-1001-1001-1001

Integer-9999

 Example PLC Program:

PLC Logic for BCD to Integer Conversion

Rung 0000 :

I:0/1 giving input condition to INT converter. When it goes ON, value placed in B3:2  is converter into INT and store the value in N7:1.

Rung 0001 :

Equal comparator block is used to give output to O:0/1 when N7:1 equals N7:2.

O:0/1 is enabled because N7:1 and N7:2 are 0.

Example PLC Program for Binary Conversion
Data File for PLC
Data Display in PLC

Rung 0000 :

I:0/0 giving input condition to INT converter. When it goes ON, value placed in B3:2-0001010001010010 is converter into INT -1562 and store the value in N7:1.

Rung 0001 :

Equal comparator block is used to give output to O:0/1 when N7:2 equals N7:1.

O:0/1 is turned off  because N7:1 and N7:2 are not equal..

 Conclusion:

We can use this explanation to understand the working of Converters in Allen Bradley programmable logic controllers (plc).

Author : Hema Sundaresan

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