78 Rockwell Automation Publication 1769-UM022C-EN-P - June 2018
Chapter 5 Communicate Over Networks
• Barcode scanners
•RFID readers
The socket interface is implemented via the Socket Object. Compact
GuardLogix 5370 controllers communicate with the Socket Object via MSG
instructions. All Compact GuardLogix 5370 controllers must use unconnected
MSG instructions with socket interfaces.
For more information on socket services, see the following:
• CompactLogix 5370 Controllers User Manual, publication 1769-UM021
• The EtherNet/IP Socket Interface Application Technique, publication
ENET-AT002
Quality of Service (QoS) and I/O Module Connections
Compact GuardLogix 5370 controllers support Quality of Service (QoS)
technology. QoS lets the controller prioritize EtherNet/IP network traffic. By
default, the Compact GuardLogix 5370 controllers are QoS-enabled. QoS can
be disabled by configuring a message instruction in the Logix Designer
application.
Some EtherNet/IP devices do not support QoS technology unless the device
firmware is upgraded to a required minimum firmware revision level. For
example, the ControlLogix™ 1756-ENBT communication module must use
firmware revision 4.005 or later to support QoS technology.
To make sure communication between Compact GuardLogix 5370 controllers
and I/O modules are maintained, verify that the EtherNet/IP devices use the
minimum firmware revision level of the product that is required to support
QoS technology.
For more information on the following, see Rockwell Automation
Knowledgebase Tech Note 66325
(available at https://rockwellautomation.custhelp.com/
):
• Minimum firmware revision levels of EtherNet/IP devices to support
QoS technology
• Enable/disable QoS
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