TN - BCD ASCII Conversions CJ

Summary/Issue Description

CJ2 How to Convert BCD to and from ASCII

Root Cause

This example is for the simplest format of 4 a single WORD of ASCII to/from single UINT_BCD. There are also 8 digit (3 byte) and 16 digit (4 byte) variations. 

Solution

STR4 Instruction

Test0Input is a trigger to convert a single UINT_BCD to a WORD of ASCII

DataValue is the UINT_BCD to be converted to a single WORD of ASCII using STR4

ASCII1 is the WORD of ASCII that is the result of Numeric to ASCII Instruction

Once converted from UINT_BCD to ASCII, the sample program converts the ASCII back to UINT_BCD

NUM4 Instruction

Test1Input is a trigger to convert one WORD of ASCII to a single UNIT_BCD using STR

Here, ASCII1 is the WORD of ASCII that is to be converted to a single UNIT_BCD

the result of Numeric to ASCII Instruction

ConvertedDataUINT is the UINT_BCD that is the result of of the ASCII to Numeric instruction

Here are screen shots of included sample program.

Date/Revision History

First review 9/30/2025 V1.0

Author:

Ed Gallagher - Technical Support Specialist

References

SYSMAC CS/CJ/NSJ Series Programmable Controllers Instruction Ref Manual