User Manual Manual

Rockwell Automation Publication 1757-UM012A-EN-P - July 2011 155

Appendix

Data Types and Data Structures

Introduction

This appendix defines data types and data structures used in the linking device

function blocks.

Data Types

The linking device function blocks contain the following data types.

Topic Page

Data Types 155

Data Structures 156

Data Type Description

Unsigned8 1 byte

Unsigned16 2 bytes

Unsigned32 4 bytes

FloatingPoint 4 bytes

VisibleString 1 byte per character (includes the 7 bit ASCII character set)

OctetString Octet strings are binary

BitString 1 byte

Time Value 8 bytes containing the date and time in units of 1/32 of a millisecond

Time of Day 6 bytes containing the time in milliseconds since midnight and days

relative to January 1, 1980

Time Difference 6 bytes containing the time in milliseconds and number of days

Date 7 bytes containing milliseconds, minutes, standard or daylight savings

setting, hours, day of the week, day of the month, months, and years