Rockwell-automation 5720 DriveLogix System Manual do Utilizador descarregar pdf (Página 129)

Publication 20D-UM002C-EN-P - November 2003

Communicating with Devices on an EtherNet/IP Link 6-13

Sending Messages

The DriveLogix controller can send MSG instructions to other controllers

over an EtherNet/IP link. Each MSG instruction requires you to specify a

target and an address within the target. The number of messages that a device

can support depends on the type of message and the type of device:

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.

This device: Support this many

unconnected messages:

Support this many

connected messages:

1756-ENBT module

(for a Logix5550 controller)

256 128

1788-ENBT daughtercard

(for a DriveLogix controller)

532

1794-AENT adapter

(for FLEX I/O)

The 1794-AENT adapter can support a total of 32 messages whether they be

connected, unconnected or some combination of both.

Ethernet PLC-5 controller 32 128

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.

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Rockwell-automation 5720 DriveLogix System Manual do Utilizador Página 129