Rockwell-automation Ethernet Design Considerations Reference Manual Manual do Utilizador descarregar pdf (Página 50)

50 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 3 Ethernet Infrastructure Features

Flex Links Protocol

The Flex Links protocol provides link-level, physical redundancy in redundant

star topologies. A pair of Layer 2 switch ports are configured to act as a backup to

each other:

• Built into Stratix 8000 and Stratix 8300 switches

• Requires redundant star topology

• Active/standby port scheme

– Provides an alternate path in case of failures, avoiding loops

– No bandwidth aggregation

– Equal speed ports recommended

– Provides fast fail over for multicast traffic

Distribution Switches

Catalyst 3750 Switch Stack

AS S A

Stratix 8000

Access Switches

A = Active

S = Standby

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 105 106

Reference Manual 1
Important User Information 2
Summary of Changes 3
New and Updated 3
Information 3
Table of Contents 5
Chapter 4 6
Chapter 5 6
Predict System Performance 6
Studio 5000 Environment 10
Additional Resources 11
EtherNet/IP Overview 13
Network Protocols 14
Configuration Requirements 15
Gateway Address 17
Subnet Mask 18
EtherNet/IP Modules in a 19
Control System 19
Bridge across Networks 20
Chapter 2 21
Topologies 22
Repeaters 25
Media Converters 26
Routers and Gateways 27
Switches 28
Autonegotiation 29
Full-duplex Mode 30
Chapter 3 31
Transmission Packets 32
Transmission Protocols 35
Domain Name System (DNS) 36
Network Address Translation 38
Supported NAT Topologies 39
Virtual LANs and 42
Segmentation 42
VLAN Trunking 44
Quality of Service (QoS) 45
Resiliency 46
Resiliency Protocols 47
EtherChannel Protocol 49
Flex Links Protocol 50
Device-level Ring (DLR) 52
Forwarding 54
Blocking 54
Internet Group Management 55
Protocol (IGMP) 55
Port Security 56
Security Violations 57
Device Commissioning 58
EtherNet/IP Protocol 59
Terminology 61
TCP Connections 62
CIP Connections 62
CIP Connection Message Types 63
CIP Connection Types 63
EtherNet/IP Network 66
Specifications 66
Packets Rate Capacity 69
Requested Packet 70
Interval (RPI) 70
Messaging 71
Explicit Messages 72
CIP Safety 73
CIP Sync 74
Integrated Motion on an 76
Connectivity to IT 77
System Prediction Goals 80
Step 4 or 6: 81
Does System 81
Performance Calculations 83
Calculate Packets/Second 86
(Fastest) 88
Example: Predict System 90
Performance 90
Explicit Messaging 92
1756-EN2T Module 1 93
MAX (Rack-optimized) 98
MAX (Analog Non-Isolated) 98
MAX (Produced/Consumed Tag) 98
Rockwell Automation Support 106
Documentation Feedback 106

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