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Excel Classic Systems  >  CEXCEL1002

CEXCEL1002      Excel RACL Programming I


Class Type            Programming


System                   Excel/Excel Microcentral


Duration                4.5 Days


Class Audience    Programmers of down-line Excel processors and/or maintenance personnel for the Excel Controllers in Excel Microcentral or Distributed Excel HVAC Systems          


Offered At             Customer site or St Paul


# of Students        Minimum 5, Maximum 8


Cost                        $1990 per person at site, $1290 per person St Paul


Brief                      The course starts with a brief introduction to an Excel/Excel Microcentral System using a simplified block diagram.  The function and intent of a DDC program in an Excel panel is then elaborated on and the difference between an Energy Management Program and a DDC program is pointed out.  The course then goes  into a study of the elements of the Honeywell Programming Language RACL (Recursive Algorithmic Control Language) the language in which Excel DDC programs are written.  Each set of Operators of the language is introduced with an example program segments which are actually tested on line.  The course also discusses some of the powerful DDC submodules provided on cassette.  These submodules convert the RACL language into a truly structured programming language ideally suited for HVAC control.  Again some of the submodules are actually used in program segments and tested on line.  The technical functions of flowcharting, writing and testing of programs are performed repeatedly to enhance learning and internalizing of a certain definitive analytical thought-pattern.


                                Written exercises are used to reinforce the learning process.


 Objectives            Upon completion of the course the student will be able to:


·         Identify the Point and Program of an Excel Controller database

·         Understand the nature and significance of an HVAC Control Loop

·         Flow-chart an HVAC Control Loop using RACL Standard Programming Symbology

·         Write RACL program code to implement a flowchart for an HVAC Control Loop

·         Use System Commands to execute written program code

·         Test/checkout a completed program for correct on-line operation     

·         Use all RACL HVAC-related Operators to write error-free and easily understood


·         Create Custom Submodules and use them in the Main Module M0

·         Save and Load Controller Program and Point databases to tape




·         Excel/Excel Microcentral System Block Diagram

·         Controller Point and Program files

·         DDC control loops

·         RACL flowchart form

·         Main Module M0

·         RACL statement flowchart

·         Introduction to Standard Submodules

·         Creating a Custom submodules

·         Creating a Datafile

·         Completing A RACL flowchart

·         Complete RACL Instruction Set

·         Deciphering System Documentation

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