ProSoft Technology ProLinx S3964R User Manual download pdf (Page 16)

16 Publication LOGIX-AP010B-EN-P - May 2010

Chapter 1 Controllers and I/O Modules

Logix Controller Memory Use

The following table provides calculations for estimating the amount of

memory needed to store a program in a Logix controller.

Additional recommendations for selecting ControlLogix system components

can be found in the ControlLogix Selection Guide, publication 1756-SG001

and Logix5000 Controllers Design Considerations, publication 1756-RM094

Example

To estimate the memory requirements of a program consisting of the

following:

• 25 Controller Tasks

• 200 Digital I/O

• 50 Analog I/O

• 5 ControlNet Modules

• 1 Ethernet Module

Logix Controller Bytes

Controller Tasks (minimum 1 required) ____ x 4000 =____ bytes

Digital I/O Points ____ x 400 =____ bytes

Analog I/O Points ____ x 2600 =____ bytes

DeviceNet Modules ____ x 7400 =____ bytes

Other Communication Modules ____ x 2000 =____ bytes

Motion Axis ____ x 8000 =____ bytes

FactoryTalk Alarm Instruction ____ x 2200 =____ bytes

FactoryTalk Subscriber ____ x 100,000 =____ bytes

Description Memory Usage

Controller Tasks 25 x 4000 = 100 KB

Digital I/O Points 200 x 400 = 80 KB

Analog I/O Points 50 x 2600 = 130 KB

Communication Modules (5+1) x 2000 = 12 KB

Total 322 KB

Spare Capacity 25% 80.5 KB

Required Memory 402.5 KB

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ProSoft Technology ProLinx S3964R User Manual Page 16