Rockwell Automation 294E ArmorStart LT EtherNet/IP Version - User Manual - Manual (Page 205)

Rockwell Automation Publication 290E-UM001B-EN-P - June 2012 205
CIP Information Appendix B
Input Only Connection
This connection is used to read data from the module without controlling the
outputs. This connection type shall not be dependent on any other connection. It
is recommended that the originator sets the data size in the O->T direction of the
Forward_Open be zero, there are however no check that this is actually the case.
• Number of supported input only connections equals four (shared with
exclusive owner and listen only connection).
Listen Only Connection
This connection is dependent on another connection to exist. If that connection
(Exclusive owner or Input only) is closed, the listen only connection shall be
closed as well.
It is recommended that the originator sets the data size in the O->T direction of
the Forward_Open be zero, there are however no checks that this is actually the
case.
If no other connection exists when listen only tries to be opened, a “Controlling
connection not open (general status = 0x01, extend status = 0x0119)” error
message shall be sent.
• Number of supported listen only connections equals four (shared with
exclusive owner and input only connection).
Class 3 Connections
Explicit Message Connection
Class 3 connections are used to establish connections to the message router.
Thereafter the connection is used for explicit messaging. Class 3 connections use
TCP connections.
• 16 concurrent Class 3 connections will be supported
IMPORTANT If an exclusive owner connection has been opened against the module and
times out, the input only connection shall time out as well. If the exclusive
owner connection is properly closed, the input only connection shall not be
affected.
Service Code
Implemented for:
Service Name Class Instance
0x01 No Yes Get_Attribute_All
0x0e No Yes Get_Attribute_Single