# How to use Converters in PLC

To study the working of Converter (BCD TO INT/ INT TO BCD) in Allen Bradley programmable logic controllers (plc).

### Integer to BCD Converter Block Diagram

Block Name : TOD (Integer to BCD Converter )

In the above picture, there are totally two parameter,

### BCD to Integer Converter Block Diagram

Block Name: FRD (BCD to Integer Converter )

In the above picture, there are totally two parameter,

## 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:

#### 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.

#### 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:

#### 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.

#### 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