Specifications

Optimizing Performance
92
EIO0000000051 6/2010
Message Types
Overview
Two types of industrial Ethernet message types are supported by the Ethernet
communication module:
Explicit Messages
Explicit messages transmit information used for device configuration and
diagnostics, and for data collection. In explicit messaging, the client issues a
request; the server receives, processes, and sends a response back to the client.
You can specify a response timeout value, indicating how long the client waits for a
response from the server. If the client does not receive a response from the server
within the response timeout period, the client reissues its request. The length of the
response timeout will vary depending on the requirements of your application.
Examples of explicit messages include: SNMP messages, FTP messages, CIP
establish connection messages, EtherNet/IP query and response messages, and
DHCP messages.
The characteristics of explicit messaging are:
z point-to-point client-server mode
z variable size
z variable frequency
z long response time
z long connection timeout
Message Type Includes...
Explicit
z Non-time critical management data
z Read/write application data
Implicit
z Real-time I/O data
z Real-time control data
z Real-time synchronization data