PLC Processor RSLOGIX AB CPU Chapter 11.ppt

Copyright © 2002 Delmar Thomson
Learning
Chapter 11
Processor Data
Organization

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.

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.

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.

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.

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.

Learning
Project File Terms (cont’d.)
Database files:
Database files contain ladder
documentation file data.

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.

Learning
RSLogix 500 Project Tree

Learning
Processor Memory Is Like
a Two-Drawer File Cabinet

Learning
Program Files in
Their Separate File Drawer

Learning
Data Files Stored
in Their Separate Drawer

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.

Learning
SLC 500
Default Data Files

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:

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.

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.

Learning
SLC 500 Output Status File

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.

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.

Learning
SLC 500 Input Status File

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.

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.

Learning
Each Bit File Element
Consists of One 16-Bit Word

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 value
Accumulated value
Status bits

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.

Learning
One Timer Element Is
Made of Three 16-Bit Words

Learning
Timer Addressing
Sample timer element addressT4:2
T4 = timer file 4
:2 = timer element #2 (0-255 timer
elements per file)

Learning
Sub-Element
A sub-element is part of an element
addressable as a unit.
value are sub-elements of a timer.
T4:0.PRE
T4:0.ACC

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.

Learning
Timer Bit Addressing
Status 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.

Learning
Timer File T4

Learning
C5, Counter File
The 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 value
Accumulated value
Status bits

Learning
C5, Counter File (cont’d.)
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.

Learning
One Counter Element Is
Made of Three 16-Bit Words

Learning
Counter Addressing
Sample counter element address
C5:2
C5 = timer file 5
:2 = counter element #2 (0-255 timer
elements per file)

Learning
Sub-Element
A sub-element is part of an element
addressable as a unit.
value are sub-elements of a counter.
C5:0.PRE
C5:0.ACC

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.

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.

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.

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.

Learning
Counter File C5

Learning
R6, the Control File
The control file is used to store status
information for
Bit shift
First in and first out stacks (FIFO)
Last in and first out stacks (LIFO)
Sequencer instructions
Certain ASCII instructions

Learning
One Control Element Is Made
of Three 16-Bit Words

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.

Learning
Integer File Element
Consists of 16-Bit Elements

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.

Learning
Floating Point File
Data Representation

Learning
User-Defined Data Files
Default 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.

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.

Learning
SLC 500 User-Defined Files

Learning
Review of SLC 500 Data Files

PLC Processor RSLOGIX AB CPU Chapter 11.ppt

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