Rockwell-automation Logix5000 Controllers Messages Programming Manual Manuel d'utilisateur télécharger pdf (Page 14)

Chapter 1 Controller messages

To determine or change the number of unconnected buffers, use a MSG

instruction.

• The range is 10 to 40 unconnected buffers.

• The default number is 10.

• Each unconnected buffers uses 1.1 KB of memory.

Get the number of unconnected buffers

To determine the number of unconnected buffers that are currently available,

configure a Message (MSG) instruction as follows.

On this tab For this item Type or choose

Configuration Message Type CIP Generic

Service Type Custom

Service Code 3

Class 304

Instance 1

Attribute 0

Source Element source_array where data type = SINT[4]

In this element Enter

source_array[0] 1

source_array[1] 0

source_array[2] 17

source_array[3] 0

Source Length (bytes) 4 (Write 4 SINTs.)

Destination Element destination_array where data type = SINT[10] (Leave all values = 0.)

destination_array[6] = current number of unconnected buffers

Communication Path 1, slot_number_of_controller

Get or set the number of

unconnected buffers

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Rockwell-automation Logix5000 Controllers Messages Programming Manual Manuel d'utilisateur Page 14