1756-rm087j-en-p, logix5000 controllers execution logix 5000 controllers execution time and memory...

Logix 5000 Controllers Execution Time and Memory Use Reference Manual - Introduction Tab
Reference Manual
Important
Summary of
Changes
The paper clip looks like this.
Important
SoftLogix5800 controllers are part of the Logix5000 family of programmable automation controllers but are not included in this publication.
This publication provides execution times and memory usage data for hard Logix5000 controllers. For SoftLogix5800 controllers, the following applies:
- Execution times for instructions used in a SoftLogix5800 program are dependent on the computer running the SoftLogix application. That is, the faster the computer, the faster the instructions execute.
- Computer memory is dependant on multiple items. Use RSLogix 5000 programming software's memory estimation tool if you require memory estimations.
Important
About This Manual
The numbers in these worksheets are based on using RSLogix 5000 programming software, version 18.00 with these firmware revisions:
- 1756 ControlLogix controllers, 1756-L6x , firmware revision 18.11
- 1756 ControlLogix controllers, 1756-L7x , firmware revision 18.12
- 1756 GuardLogix controllers, firmware revision 18.11
- 1768 CompactLogix controllers, firmware revision 18.11
- 1768 Compact GuardLogix controllers, firmware revision 18.11
- 1769 CompactLogix controllers, that is 1769-L2x and 1769-L3x , firmware revision 18.11
- PowerFlex 700S AC drive with DriveLogix controllers, firmware revision 18.11
Actual results may vary because of the configuration of your project and the software version and firmware revision.
This PDF file was generated with a paper size of 11" x 17" that is landscape oriented. When printing this PDF file, remember that this paper size and orientation is different from most other Rockwell Automation
documentation.
This PDF file, that is, 1756-RM087J-EN-P.pdf, contains information for all Logix5000 controller types with each section. However, you may only need instruction execution times or memory usage information for one specific Logix controller
type. You can find PDF files and Excel files in the Attachments area for specific Logix controller types. For example, if you only need information for ControlLogix controllers in Excel format, click the file named 1756-RM087J-EN-P -
ControlLogix_GuardLogix.xls.
To access the content from this PDF file in a Microsoft Excel file, click the attachment named 1756-RM087J-EN-P.xls in the Attachments area of the window.
To open the Attachments section of this window, click the paper clip icon in the lower left area of the
window.
This revision of the manual includes execution time and memory use information for ControlLogix 1756-L73 and 1756-L75 controllers. See the individual tabs for specific information on these controllers.
Logix5000 Controllers Execution Time and Memory Use
Catalog Numbers 1756 ControlLogix, 1756 GuardLogix, 1768 CompactLogix, 1768 Compact GuardLogix, 1769 CompactLogix, 20D PowerFlex 700S with DriveLogix
This PDF file provides a complete listing of all instruction execution time and memory usage information for Logix5000 controllers, firmware revision 18.11 (except ControlLogix 1756-L7x controllers that use firmware revision 18.12), in your
RSLogix 5000 programming software, version 18.00, program. The worksheets assist you when estimating the execution times and memory usage of the logic in your program. Use this information to select from different programming
options.
f f ff f f f
Logix5000 controllers use a cache mechanism to enhance the performance of instructions. Actual performance depends on how sequentially the data is laid out and how frequently it is accessed.
Caching has a significant impact on the execution times of bit instructions (XIC, XIO, OTE, OTU, OTL). Logix5000 controllers sometimes execute instructions directly out of cache. At other times, Logix5000 controllers
do not execute instructions directly out of cache. For example, instructions may execute based on such functionality as cache swapping. Execution times are optimal when execution occurs directly out of cache. The
times provided in this publication represent optimal times. When your instructions do not execute directly out of cache, you will experience times slower than provided here.
When you download your project, the controller optimizes memory usage, which could reduce your calculated memory usage by as much as 10% from the values presented in this worksheet.
1756-RM087J-EN-P - August 2010Supersedes Publication 1756-RM087I-EN-P - April 2010

Logix 5000 Controllers Execution Time and Memory Use Reference Manual - Introduction Tab
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or
liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.
Allen-Bradley, CompactLogix, ControlLogix, DriveLogix, GuardLogix, Logix5000, PowerFlex, Rockwell Automation, RSLogix 5000, and SoftLogix are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1, available from your
local Rockwell Automation sales office or online at http://www.rockwellautomation.com/literature) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference,
and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.
Important User Information
http://literature.rockwellautomation.com/idc/groups/literature/documents/in/sgi-in001_-en-p.pdf

Logix 5000 Controllers Execution Time and Memory Use Reference Manual - Examples Tab
Examples
Ladder Instructions
Example Data Type Memory
(bytes)
Execution
Time (s)
Description
ADD DINT 28 0.26 ADD instruction
Source A DINT
Source B DINT
Destination DINT
28 0.26 Total
Array subscripts
(bytes)
Execution
Time (s)
Description
Source A DINT[DINT] 84 0.69 array subscript
Source B DINT
Destination DINT
112 0.95 Total
Expressions
(bytes)
Execution
Time (s)
Description
CPT (tag_a + tag_b) 80 1.66 CPT instruction
ADD (+) DINT 28 0.26 ADD operator
108 1.92 Total
Here are some examples for a 1756-L63 controller:
Here is an example for a 1756-L63 controller:
When an array uses a tag for one of its subscripts (e.g., Array_A[Tag_B]), additional memory
and execution time is required, depending on the number of dimensions in the array.
Memory use and execution time for an instruction increases for each parameter that
references an array.
If an instruction contains an expression (CMP, CPT, FAL, FSC), then add memory and time
for each operator in the expression. For each operator, use the values for the corresponding
instruction.

Ladder Instructions
(continued)
Data Conversions
(bytes)
Execution
Time (s)
Description
ADD REAL 44 1.53 ADD instruction
Source A DINT 96 2.51 DINT to REAL
conversion
Source B REAL
Destination REAL
140 4.04 Total
ADD REAL 44 1.53 ADD instruction
Source A DINT 96 2.51 DINT to REAL
conversion
Source B REAL
Destination DINT 92 3.62 REAL to DINT
conversion
232 7.66 Total
Source A INT 80 0.52 INT to DINT
conversion
Source B INT 80 0.52 INT to DINT
conversion
Destination INT 72 2.35 DINT to INT
conversion
260 3.65 Total
If you use a data type that is not an optimal data type or if you mix data types, you must
add memory and execution time for data conversion.
Logix5000 controllers typically compare or manipulate values as DINTs or REALs (optimal
data type).
If you use mix integers and REALs in an instruction, the controller converts the values to
REALs and then back to the destination data type.

Function Block
Elements
Function

1756-rm087j-en-p, logix5000 controllers execution logix 5000 controllers execution time and memory...

Documents