Rockwell Automation Publication 1789-UM002K-EN-P - January 2015 25
What is the SoftLogix System? Chapter 2
Determine a Memory Size
These equations provide an estimate of the memory needed for a controller.
Each of these numbers includes a rough estimate of the associated user
programming. Depending on the complexity of your application, you might
need additional memory.page 22
Controller tasks _____ * 4000 = _____ bytes (min 1 needed)
Discrete I/O points _____ * 400 = _____ bytes
Analog I/O points _____ * 2600 = _____ bytes
Communication modules _____ * 2000 = _____ bytes
Motion axis _____ * 8000 = _____ bytes
Total = _____ bytes
If you want to change the amount of memory you specified for a controller, you
must first remove the controller from the SoftLogix chassis monitor, then
reinstall the controller and specify the new memory size.
Table 1 - Chassis Motor Characteristic
Characteristic Description
Startup mode Specify how the controller should behave when its service is started.
Select Remote Program (default) or Last Controller State.
Memory size Specify the memory size (KB) to allow for the controller.
The maximum limit depends on the controller type. See page 25
for more information.
Periodic save interval Specify whether you want to save the current controller information (tag data values and configuration information)
periodically, and if so, specify how often (minutes). Specify an interval between 0.5…30 minutes. Online edits to the
program are saved instantly, regardless of Periodic Save interval. The default is enabled for 10 minutes.
See page 26
about this setting’s impact on overall system performance.
Continuous task dwell time (ms) Specify the dwell time (0…1000 ms) made available for all other Windows applications. The default is 10 ms.
The dwell time is the time between the end of the continuous task and the start of the next execution of the continuous
task. This setting has an impact on overall system performance, see Appendix
E.
CPU affinity If your computer has multiple Pentium CPUs, choose which CPU to use for this controller. The default is CPU 0.
Channel 0 serial port Choose which COM port to use for serial communication. Choose COM1, COM2, COM3, or COM4. The default is none.
The memory size you specify is the amount of RAM in your computer that
you want to allocate to the SoftLogix controller. The maximum memory size
per controller is determined by the controller type.; see page 25
for more
information. This allocated RAM is not available to the Windows operating
system or any other application.
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