Rockwell-automation 5730 DriveLogix5730 Controller for PowerFlex 700S Manuale Utente Scaricare il pdf (Pagina 150)

7-10 Communicating with Devices on a ControlNet Link

firmware, the MSG instruction errors because the destination

tag is not large enough. To correct this error, change the

destination tag to a DINT data type.

MSG instructions are unscheduled. The type of MSG determines whether or

not it requires a connection. If the MSG instruction requires a connection, it

opens the needed connection when it is executed. You can configure the

MSG instruction to keep the connection open (cache) or to close it after

sending the message.

Connected messages are unscheduled connections on ControlNet.

If a MSG instruction uses a connection, you have the option to leave the

connection open (cache) or close the connection when the message is done

transmitting.

The controller has the following limits on the number of connections that

you can cache:

This type of message: And this communication method: Uses a connection:

CIP data table read or write X

PLC2, PLC3, PLC5, or SLC (all types) CIP

CIP with Source ID

DH+ X

CIP generic CIP Optional

(1)

block-transfer read or write X

(1)

You can connect CIP generic messages, but for most applications, we recommend you leave CIP generic messages unconnected.

If you: Then:

Cache the connection The connection stays open after the MSG instruction is done. This

optimizes execution time. Opening a connection each time the

message executes increases execution time.

Do not cache the

connection

The connection closes after the MSG instruction is done. This frees up

that connection for other uses.

If you have this software

and firmware revision:

Then you can cache:

12.x or later up to 32 connections

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Rockwell-automation 5730 DriveLogix5730 Controller for PowerFlex 700S Manuale Utente Pagina 150