20 Rockwell Automation Publication 1756-UM004D-EN-P - August 2022
Chapter 1 ControlLogix EtherNet/IP Network Device Overview
Syslog Event Logging
The 1756-EN4TR module supports syslog event logging. Do not use FactoryTalk
AssetCentre for logging if you want to use a syslog collector.
Choose a syslog collector that supports the following:
• RFC-5424 syslog protocol
• Ability to receive messages from the 1756-EN4TR module
To set the IP address of the syslog collector, use FactoryTalk Policy Manager
software.
For more information, see:
• CIP Security with Rockwell Automation Products Application Technique,
publication SECURE-AT001
.
• Logix 5000 Controller and I/O Fault Codes and Syslog Messages,
publication 1756-RD001
.
Parallel Redundancy
Protocol
Parallel Redundancy Protocol (PRP) is defined in international standard
IEC 62439-3 and provides high-availability in Ethernet networks. PRP
technology creates seamless redundancy by sending duplicate frames to two
independent network infrastructures, which are known as LAN A and LAN B.
A PRP network includes the following components.
For more information about PRP, see the EtherNet/IP Parallel Redundancy
Protocol Application Technique, publication ENET-AT006
.
IMPORTANT The 1756-EN4TR module must be connected to the same network as the
syslog collector.
Component Description
LAN A and LAN B Redundant, active Ethernet networks that operate in parallel.
Double attached node (DAN) An end device with PRP technology that connects to both LAN A and LAN B.
Single attached node (SAN)
An end device without PRP technology that connects to either LAN A or LAN B.
A SAN does not have PRP redundancy.
Redundancy box (RedBox)
A switch with PRP technology that connects devices without PRP technology to
both LAN A and LAN B.
Virtual double attached node
(VDAN)
An end device without PRP technology that connects to both LAN A and LAN B
through a RedBox.
A VDAN has PRP redundancy and appears to other nodes in the network as a DAN.
Infrastructure switch A switch that connects to either LAN A or LAN B and is not configured as a RedBox.
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