Omron CJ1W-EIP21 Operation Manuals page 387

For nj-series cpu unit. cj-series ethernet/ip units

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Table of Contents

 Variables with Four-byte Alignments (e.g., DWORD)

Four bytes of memory are allocated for the four-byte alignment.

The location of the first byte of data in memory is an integer multiple of four bytes. Therefore, if a

variable with a two-byte alignment, such as WORD data, is inserted, two bytes of unused memory

will remain.

Example: Consecutive variables in the following order: DWORD, WORD, and DWORD

First byte +

(integer multiple of 4)

First byte +

(integer multiple of 2)

First byte +

(integer multiple of 4)

CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)

First byte + 1

First byte + 2

First byte + 3

First byte + 4

First byte + 5

First byte + 6

First byte + 7

First byte + 8

First byte + 9

First byte + 10

First byte + 11

Variable Table

Troubleshooting