Allen-Bradley 1757-FFLD2, User Manual

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