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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 63

EtherNet/IP Protocol Chapter 4

CIP Connection Message Types

CIP connections use one of the following CIP connection message types:

• Implicit

• Explicit

Implicit connections are time critical in nature. This includes I/O and

produced/consumed tags. Implicit refers to information (such as source address,

data type, or destination address) that is implied in the message but not

contained in the message.

Explicit connections are non-time critical and are request/reply in nature.

Executing a MSG instruction or executing a program upload are examples of

explicit connections. Explicit refers to basic information (such as source address,

data type, or destination address) that is included in every message.

CIP Connection Types

CIP connection types determine how CIP connections transfer data on the

network. The CIP connection types determine whether a connection is

established between devices. If a connection is established between devices, the

connection type determines if that connection remains open after data is

transferred.

There are two CIP connection types:

• Connected—Available with both implicit and explicit messages.

• Unconnected—Available with only explicit messages.

Table 10

describes how CIP connections are used with implicit and explicit

messages.

IMPORTANT

CIP connections are further defined by these additional connection

parameters:

• CIP Connection Message Types

• CIP Connection Types

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual do Utilizador Página 63