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Copyright © 2002 Delmar Thomson Learning
Objectives
Describe a processor file.Explain what two files make up a
processor file.Explain the function of a program
file.Explain the function of a data file.List the contents of a program file.
Copyright © 2002 Delmar Thomson Learning
Objectives (cont’d.)
Explain the contents of a bit file.Explain how a bit file is made up.Explain the contents and makeup
of an integer file.
Copyright © 2002 Delmar Thomson Learning
Objectives (cont’d.)
Explain what an element and a sub-element are.
List which instructions have multiple word elements.
Describe what status bits are and where they are used.
Copyright © 2002 Delmar Thomson Learning
Project File Terms
Project:The collection of the ladder program
and all associated information.Processor file:
Contains all information that is downloaded into the processor. The processor file contains program files and data files.
Copyright © 2002 Delmar Thomson Learning
Project File Terms (cont’d.)
Program files:Program files are ladder files. The
SLC 500 can contain up to 256 ladder files.
Data files:Data files contain data associated
with the ladder file(s). The SLC 500 can contain up to 256 data files.
Copyright © 2002 Delmar Thomson Learning
Project File Terms (cont’d.)
Database files:Database files contain ladder
documentation file data.
Copyright © 2002 Delmar Thomson Learning
RSLogix 500 Project Tree
The RSLogix 500 software stores all project files in the project tree.
File is a group of related elements.Project tree is similar to a table of
contents.
Copyright © 2002 Delmar Thomson Learning
SLC 500 Default Data Files
When a new project is created, the software creates data files 0 through 8.
Each file has a file identifier and a file number.
A file is a group of related elements.The file identifier and file number
make up part of the data stored in the files address.
Copyright © 2002 Delmar Thomson Learning
SLC 500 Default Data Files
(cont’d.)
Each file contains specific information needed by the processor in order to complete its job of executing the user ladder program.
Default data files are organized as follows:
Copyright © 2002 Delmar Thomson Learning
File 0, Output Status File
Made up of single bits grouped into a 16-bit word.
Each bit represents the on or off state of one output point.
There is one output word reserved for each output module in your SLC 500 system.
Copyright © 2002 Delmar Thomson Learning
File 0, Output Status File(cont’d.)
File identified as file O.Bit identifiers across top of file
represent discrete output screw terminal designation.
Address format O:2.0.O identifies output file type.2 identifies output module in chassis
slot 2..0 identifies word zero.
Copyright © 2002 Delmar Thomson Learning
File 1, Input Status File
Made up of single bits grouped into a 16-bit word.
Each bit represents the on or off state of one input point.
There is one input word reserved for each input module in your SLC 500 system.
Copyright © 2002 Delmar Thomson Learning
File 1, Input Status File (cont’d.)
File identified as file 1.Bit identifiers across top of file
represent discrete output screw terminal designation.
Address format I:3.0.I identifies output file type.3 identifies input module in chassis
slot 3..0 identifies word zero.
Copyright © 2002 Delmar Thomson Learning
SLC 500 Input Status File (cont’d.)
Only words in the output and input status files are created for I/O modules that actually exist in the SLC 500 system.
Output and input status file word creation is part of the I/O configuration process.
Copyright © 2002 Delmar Thomson Learning
B3, Binary or Bit File
The binary or bit file stores single bit data.
Binary file also referred to a internal coil, internal relay storage.
Internal bits are used to store internal data.
Identified as file B3.
Copyright © 2002 Delmar Thomson Learning
T4, Timer File
The timer file stores only timer elements.
An element is a word or group of words that work together as a unit.
A timer is made of three pieces or words:Preset valueAccumulated valueStatus bits
Copyright © 2002 Delmar Thomson Learning
T4, Timer File (cont’d.)
The preset value and accumulated value are 16-bit signed integers.
Status bits are single bits that make up one 16-bit word.
These three words work together as a unit.
Copyright © 2002 Delmar Thomson Learning
Timer Addressing
Sample timer element addressT4:2T4 = timer file 4:2 = timer element #2 (0-255
timer elements per file)
Copyright © 2002 Delmar Thomson Learning
Sub-Element
A sub-element is part of an element addressable as a unit.
The preset value and accumulated value are sub-elements of a timer.T4:0.PRET4:0.ACC
Copyright © 2002 Delmar Thomson Learning
Timer Status Bits
Timers have three status bits.Done bit (DN) is true when the
accumulated value and preset are equal.
Timer timing bit (TT) is true when the timer is timing.
Enable bit (EN) is true when the timer instruction is enabled or true.
Copyright © 2002 Delmar Thomson Learning
Timer Bit AddressingStatus bit addresses for timer file 4,
timer element 2 (T4:2) are listed below:
T4:2/DN is the address for the done bit.
T4:2/EN is the address for the enable bit.
T4:2/TT is the address for the timer timing bit.
Copyright © 2002 Delmar Thomson Learning
C5, Counter FileThe counter file stores only counter
elements.An element is a word or group of
words that work together as a unit.A counter is made of three pieces or
words:Preset valueAccumulated valueStatus bits
Copyright © 2002 Delmar Thomson Learning
C5, Counter File (cont’d.)
The preset value and accumulated value are 16-bit signed integers.
Status bits are single bits that make up one 16-bit word.
These three words work together as a unit.
Copyright © 2002 Delmar Thomson Learning
Counter Addressing
Sample counter element address C5:2C5 = timer file 5:2 = counter element #2 (0-255
timer elements per file)
Copyright © 2002 Delmar Thomson Learning
Sub-Element
A sub-element is part of an element addressable as a unit.
The preset value and accumulated value are sub-elements of a counter.C5:0.PREC5:0.ACC
Copyright © 2002 Delmar Thomson Learning
Counter Status Bits
Counter has five status bits.Done bit (DN) is true when the
accumulated value and preset are equal.
Count up enable bit (CU) is true when the up counter is true or enabled.
Count down enable bit (CD) is true when the count down counter is enabled or true.
Copyright © 2002 Delmar Thomson Learning
Counter Status Bits (cont’d.)
The overflow bit (OV) is true when the up counter has overflowed above +32767.
The underflow bit (UN) is true when the down counter has underflowed below -32768.
The update accumulator bit (UA) is a high-speed counter status bit for fixed SLC 500 PLCs.
Copyright © 2002 Delmar Thomson Learning
Counter Status Bit Addressing
Status bit addresses for counter file 5, counter element 0 (C5:0) are listed below:
C5:0/DN is the address for the done bit.
C5:0/CU is the address for the count up enable bit.
Copyright © 2002 Delmar Thomson Learning
Counter Status Bit Addressing (cont’d.)
C5:0/CD is the address for the count down enable bit.
C5:0/OV is the address for the count up overflow bit.
C5:0/UN is the address for the count down underflow bit.
Copyright © 2002 Delmar Thomson Learning
R6, the Control File
The control file is used to store status information for Bit shiftFirst in and first out stacks (FIFO)Last in and first out stacks (LIFO)Sequencer instructionsCertain ASCII instructions
Copyright © 2002 Delmar Thomson Learning
N7, Integer File
The integer file stores a 16-bit signed integer representing a whole number.
Integer file data range –32,768 to +37,767.
Integer file has no status bits.Each integer file can have 0 to 255
integer elements.
Copyright © 2002 Delmar Thomson Learning
F8, Floating Point File
Storage of fractional numerical data or values greater than 32767.
Data range of 1.1754944e-38 to 3.40282347e+38.
Floating point file is processor operating system dependant.
Must have 5/03 modular processor with OS 301 or above, 5/04 or 5/05 processor.
Copyright © 2002 Delmar Thomson Learning
User-Defined Data FilesDefault files are data files 0 through
8.Total of 256 data files if processor
will support them.Each data file can have up to 256
elements if processor supports them and has enough memory.
Files greater than file number 8 are user defined files.
Copyright © 2002 Delmar Thomson Learning
User-Defined Data Files
User-defined files are data files the user can create and define as needed for specific applications.
Cannot create additional output, input, or status files.