Rockwell-automation 1336T Function Block Prog. Manual, Series A/B Bedienungsanleitung PDF herunterladen (Seite 49)

Chapter 3

3–1

1336 FORCE — 5.9 August 1995

System Interactions

This chapter provides information about the following topics:

❒ The function block BRAM functions

❒ The power up sequence

❒ The compiler modes and terminal operation differences

❒ Multiple execution list copies

❒ The task status services

❒ The link processing faults

❒ The performance issues that concern links

Function block applications use two kinds of memory: RAM and

BRAM.

❒ RAM, or Random Access Memory, is the working memory area

where information is stored while the system is powered up. Any

information that is in RAM is lost when you remove the power,

perform a system reset, or performs a function block Init. When a

function block application is properly set up, the application

executes partially out of RAM and manipulates data stored in

RAM.

❒ BRAM, or Battery backed up RAM (also known as EEPROM), is

memory which is retained when the power is removed from the

system. You can copy your function block application from RAM

to BRAM by saving it. If you save your function block

application in BRAM, it is transferred from BRAM to RAM

when the power is cycled or a drive reset occurs.

The following are descriptions of the function block Init (initialize),

function block Store (save), and function block Recall (restore)

operations.

Chapter Objectives

The Function Block BRAM

Functions

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Rockwell-automation 1336T Function Block Prog. Manual, Series A/B Bedienungsanleitung Seite 49