Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 142)

142 Rockwell Automation Publication 1783-UM003I-EN-P - March 2014
Chapter 5 Manage the Switch via the Studio 5000 Environment
EtherNet/IP CIP Interface Stratix 8000 and Stratix 8300 switches contain an EtherNet/IP network
interface. EtherNet/IP is an industrial automation network specification
maintained by the Open DeviceNet Vendor Association (ODVA). It uses the
Common Industrial Protocol (CIP) for its application layer, and TCP/UDP/IP
for its transport and network layers. This interface is accessible via any of the
switch's Ethernet ports by using the IP address of the switch.
CIP Network Connections
CIP is an object-oriented connection-based protocol that supports two basic
types of messaging:
• Explicit messaging
• Implicit messaging (I/O connections)
A maximum of 32 connections is available. Both connection types must use the
switch password before any switch parameters can be written. The password is
the same one you entered during Express Setup.
.
Table 20 - CIP Network Connections
Connection Description
Explicit messaging Explicit messaging connections provide generic, multi-purpose communication paths
between two devices. These connections are often referred to as messaging connections.
Explicit messages provide the typical request/response-oriented network communication.
Each request is typically directed at a different data item. Explicit messages can be used for
configuring, monitoring and troubleshooting the switch.
The Explicit Messaging interface is used by the Add-on Profile for the switch.
Implicit messaging
(I/O connections) I/O connections provide dedicated, special purpose communication paths between a
producing application and one or more consuming applications. The application-specific I/
O data that moves through these connections is typically a fixed, cyclical structure.
The Switch supports two I/O connection choices:
• Input Only
• Exclusive Owner
Both connections are cyclic and adjustable from 300...5000 ms.
The Input Only connection contains a data structure with status information about the
switch in general and specific status on each of the ports. This connection is multicast and
can be shared by multiple controllers (connection originators).
The Exclusive Owner connection uses the same Input data structure as the Input Only
connection, but adds an Output data structure. The Output data contains a bit for each port
that lets you enable or disable each port separately. While the input data on this connection
can be shared by multiple controllers, only one controller can own the output data. If a
second controller attempts to open this connection, the connection is rejected.
IMPORTANT Because the output data is sent cyclically by the controller, it overrides any
other attempt to enable or disable a port from other software tools or
visualization stations.