Danfoss MCA 121 User Manual

4.1.4 IP traffic
The use of Ethernet based network for industrial
automation purposes, calls for careful and thorough
network design. Especially the use of active network
components like switches and routers requires detailed
know-how about the behaviour of IP traffic.
Some important issues:
Multicast
Multicast traffic; is traffic that is addressed to a number of
recipients. Each host processes the received multicast
packet to determine if it is the target for the packet. If not,
the IP package is discarded. This causes an excessive
network load of each node in the network since they are
flooded with multicast packages. The nature of EtherNet/IP
traffic is that all Originator-to-Target traffic is Unicast
(point-to-point) but Target-to-Originator traffic is optional
Multicast. This enables that several listen only -connections
can be made to a single host.
In switched networks hosts also have the risk of becoming
flooded with multicast traffic. A switch usually forwards
traffic by MAC address tables build by looking into the
source address field of all the frames it receives.
A multicast MAC address is never used as a source address
for a packet. Such addresses do not appear in the MAC
address table, and the switch has no method for learning
them, so it will just forward all multicast traffic to all
connected hosts.
IGMP
IGMP (Internet Group Management Protocol) is an
integrated part of IP. It allows hosts to join or leave a
multicast host group. Group membership information is
exchanged between a specific host and the nearest
multicast router.
For EtherNet/IP networks it is essential that the switches
used, supports IGMP Snooping. IGMP Snooping enables
the switch to “listen in" on the IGMP conversation between
hosts and routers. By doing this the switch will recognise
which hosts are members of which groups, thus being able
to forward multicast traffic only to the appropriate hosts.
Redundancy
For an Ethernet network to function properly, only one
active path can exist between two nodes. Spanning-Tree
Protocol is a link management protocol that provides path
redundancy while preventing undesirable loops in the
network.
When loops occur, some switches see stations appear on
both sides of it self. This condition confuses the forwarding
algorithm and allows for duplicate frames to be forwarded.
Spanning tree
To provide path redundancy, Spanning-Tree Protocol
defines a tree that spans all switches in an extended
network. Spanning-Tree Protocol forces certain redundant
data paths into a standby (blocked) state. If one network
segment in the Spanning-Tree Protocol becomes
unreachable, or if Spanning-Tree Protocol costs change,
the spanning-tree algorithm reconfigures the spanning-tree
topology and re-establishes the link by activating the
standby path.
Spanning-Tree Protocol operation is necessary if the
frequency converters are running in a ring/redundant line
topology.
How to Configure MCA 121 EtherNet/IP
16 MG.90.J3.02 - VLT
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44

Danfoss MCA 121 Specifications

General

Device Type	Media Converter
Model	MCA 121
Manufacturer	Danfoss
Serial Interface	RS-485
Ethernet Interface	10/100Base-TX
Mounting	DIN rail
Protection Class	IP20
Power Supply	24 V DC
Operating Voltage	24 V DC ±10%
Storage Temperature	-40°C to +85°C
Humidity	5 – 95% RH, non-condensing
Certifications	CE, UL
Dimensions (W x H x D)	22.5 x 99 x 114 mm

Summary

1 Safety

1.1.2 Safety Note

Important safety note regarding high voltage and personal injury risks.

1.1.3 Safety Regulations

Essential safety regulations for operating and maintaining the frequency converter.

1.1.4 Warning against Unintended Start

Warning about potential unintended motor start during operation or maintenance.

2 Introduction

2.1.1 About this Manual

Overview of the manual's structure, content, and intended audience.

2.1.2 Technical Overview

Technical introduction to EtherNet/IP and its role in automation.

2.1.4 Hardware

Specifics of the MCA 121 EtherNet/IP option hardware.

2.1.6 Available Literature

List of related Danfoss documentation for the product.

2.1.8 ODVA Conformance

Information on the EtherNet/IP option's conformance to ODVA standards.

2.1.9 Abbreviations

Glossary of abbreviations used throughout the manual.

3 How to Install

3.1.1 The EtherNet/IP Option

Overview of the EtherNet/IP option hardware and its components.

3.1.2 How to Install Option in Frequency Converter

Step-by-step instructions for installing the option into the converter.

3.1.3 LED Behaviour

Explanation of the status and network LEDs on the option.

3.1.4 Topology

Description of network topologies (star, line) supported by MCA 121.

3.1.5 Network

Requirements and recommendations for the Ethernet network media and components.

3.1.6 Recommended Design Rules

Guidelines for designing robust Ethernet networks with the option.

3.1.7 EMC Precautions

Precautions to ensure interference-free operation of the Ethernet network.

4 How to Configure

4.1.1 IP Settings

Configuration of IP address, subnet mask, and gateway for network communication.

4.1.2 Ethernet Link Parameters

Settings related to Ethernet link speed, duplex, and auto-negotiation.

4.1.3 Configuring the Scanner

Steps for configuring a Rockwell scanner to communicate with the option.

4.1.4 IP traffic

Understanding and managing IP traffic, including multicast and Spanning-Tree Protocol.

5 How to Control

5.1.1 I/O Assembly Instances

Definition and options for process control I/O assembly instances.

5.1.2 EtherNet/IP Connections

Overview of supported CIP connection types for EtherNet/IP.

5.1.3 Class 1 connection

Details on establishing Class 1 I/O connections using TCP transport.

5.1.4 Class 3 connection

Details on establishing Class 3 connections using UDP transport.

5.1.6 Control Word Profile

Selection of control word interpretation profiles (ODVA or FC).

5.1.7 Change of State, COS

Using Change of State for efficient network traffic management.

5.2 Danfoss FC Control Profile

Detailed explanation of the Danfoss specific control profile and its bits.

5.2.1 Danfoss FC Control Profile

Explanation of the bits within the Danfoss FC control profile.

5.2.2 Status Word according to FC Profile (STW)

Interpretation of the status word (STW) for the FC profile.

5.3 ODVA Control Profile

Details of the ODVA specific control profile and its bits.

5.3.1 Control Word under Instances 20/70 and 21/71

Explanation of the control word structure for ODVA instances.

5.3.2 Status Word under Instances 20/70 and 21/71

Explanation of the status word structure for ODVA instances.

5.4 Reference Handling

How to manage speed references from the bus.

5.4.1 Bus Speed Reference Value

Configuration of speed reference values transmitted via the bus.

6 Parameters

6.1 Parameter Group 8-**

Detailed description of parameter group 8, covering control and bus settings.

6.2 Parameter Group 12-**

Detailed description of parameter group 12, covering IP and Ethernet settings.

6.2.1 12-0* IP Settings

Configuration of network IP settings.

6.2.2 12-1* Ethernet Link Parameters

Parameters controlling Ethernet link behavior.

6.2.3 12-2* Process Data

Configuration for process data input/output.

6.2.4 12-3* EtherNet/IP

EtherNet/IP specific parameters for warnings and control.

6.2.5 12-80 Other Ethernet Services

Configuration for Ethernet services like FTP, HTTP, SMTP.

12-90 Cable Diagnostic

Enables advanced cable diagnostic functions.

12-91 Auto Cross Over

Controls the auto cross-over function for Ethernet ports.

12-93 Cable Error Length

Displays cable error length detected by diagnostics.

12-94 Broadcast Storm Protection

Protects the network from broadcast storms.

6.3 Parameter List

A comprehensive list of all parameters and their settings.

6.4 Data Types

Information on supported data types and conversion factors.

6.4.1 Data Types Supported by FC202/FC300

List of data types and their conversion factors for FC202/FC300.

7 Troubleshooting

7.1.1 Step-by-step Troubleshooting

Guided troubleshooting steps for common issues.

Check: LEDs

Checking the status of module and network LEDs.

Check: Link Status

Verifying the Ethernet link status.

Check: Cabling

Troubleshooting potential cabling issues.

Check: IP Address

Verifying IP address configuration and conflicts.

7.1.2 Alarm Word and Warning Word

Understanding alarm and warning messages displayed by the converter.

8 Appendix

8.1 Supported CIP Objects

Overview of supported Common Industrial Protocol (CIP) objects.

Class ID 0x01 Identity Object

Details of the Identity object class and its attributes.

Class ID 0x04 Assembly Objects

Details of assembly object classes and their instances/attributes.

Class ID 0x06 Connection Manager

Details of the connection manager object class.

Class ID 0x28 Motor Data Object

Details of the motor data object class and its attributes.

Class ID 0x29 Control Supervisor Object

Details of the control supervisor object class.

Class ID 0x2A AC/DC Drive Object

Details of the AC/DC drive object class and its attributes.

Class ID 0xF5 Interface Object

Details of the interface object class.

Class ID 0xF6 Link Object

Details of the link object class.

Class ID 0x0F Parameter Object

Details of the parameter object class.

Class ID 0x10 Parameter Group Object

Details of parameter group objects.

Class ID 0x64 - 0xC7 Danfoss Objects

Details of Danfoss specific objects for parameter access.