Text String Processing Instructions - Omron CJ - REFERENCE MANUAL 10-2009 Reference Manual

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Text String Processing Instructions

Text String Processing Overview

Data from the beginning until a NUL code (00 hex) is handled as text string data expressed in ASCII

(except for 1-byte, special characters). It is stored from leftmost to rightmost bytes, and from rightmost

to leftmost words.

When there is an odd number of characters, 00 hex (NUL code) is stored in the available space in the

rightmost byte of the final word.

Example: Text string ABCDE

When there is an even number of characters, 0000 hex (two NUL codes) is stored in the leftmost and

rightmost bytes of the word following the final word.

Example: Text string ABCD

As shown in the following diagram, a text string can be specified by simply designating the first word of

that string. The text string data up until the next NUL code (00 hex) will then be handled as a single

block of ASCII data.

Example: MOV$ D0 D100

Text string processing instructions can be used to execute at a PLC the various kinds of text string

processing (product data, and so on) that used to be executed at the host computer.

For example, production plan data such as product names can be transferred from the host computer to

the PLC. Various operations such as inserting and rearranging text strings can be then be performed at

the PLC, thereby reducing the data processing load at the host computer.

CS/CJ/NSJ Series Instructions Reference Manual (W474)

Host computer

3. Instructions

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