Rockwell-automation Logix5000 Controllers Controller Information and S Manual de usuario descargar pdf (Pagina 20)

Chapter 2 Determine controller memory information

There are several ways to use logic to get memory information.

• Get memory information from the controller on page 20

• Choose the memory information on page 21.

• Convert INTs to a DINT on page 22.

Get memory information from the controller

To get memory information from the controller, execute a Message (MSG)

instruction. The following table lists configuration information for the

instruction.

On this tab For this item Type or select

Which means

Configuration Message Type CIP Generic Execute a Control and Information Protocol command.

Service Type Custom Create a CIP Generic message that is not available in the list.

Service Code 3 Read specific information about the controller (GetAttributeList service).

Class 72 Get information from the user memory object.

Instance 1 This object contains one instance.

Attribute 0 Null value.

Source Element source_array of type SINT[12]

In this element Enter Which means

source_array[0] 5 Get 5 attributes.

source_array[1] 0 Null value.

source_array[2] 1 Get free memory.

source_array[3] 0 Null value.

source_array[4] 2 Get total memory.

source_array[5] 0 Null value.

source_array[6] 5 Get largest contiguous block of additional free logic memory.

source_array[7] 0 Null value.

source_array[8] 6 Get largest contiguous block of free I/O memory.

source_array[9] 0 Null value.

source_array[10] 7 Get largest contiguous block of free data and logic memory.

source_array[11] 0 Null value.

Source Length 12 Write 12 bytes (12 SINTs).

Destination INT_array of type INT[29]

Communication Path 1, slot_number_of_controller

Write Logic to Get Memory

Information

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Rockwell-automation Logix5000 Controllers Controller Information and S Manual de usuario Pagina 20