turck blog

Ethernet Overview

TURCK 6/6/2018
What is it?
 
Industrial Ethernet is the result of applying traditional Ethernet standards for data communication to industrial applications.
 
What are its basic components?
 
I/O slaves (Servers), masters (Clients), communication cable and power supply and cable.
 
Where is it used?
 
Industrial automation, mobile equipment, transportation, medical, military and PLC to PLC communication.
 
Who is responsible for it?
 
Ethernet physical layer is standardized in IEEE 802.3. Application layers like EtherNet/IP, PROFINET and Modbus TCP are open standards with independent governing bodies.
 
Overview
 
Ethernet is the most commonly used computer networking technology for local area networks (LANs) and is standardized in IEEE 802.3. As Ethernet continues to find its way into other applications, it is rapidly becoming the network of choice for higher-level industrial control applications. Industrial Ethernet is the result of applying traditional Ethernet standards for data communication to industrial applications. Industrial Ethernet is primarily used to connect PLCs, computers, HMI displays and other high-level components. The term “Ethernet” refers to the lower-level communication structure. Various versions, or implementations, of Ethernet are available, such as Ethernet/IP, PROFINET and Modbus TCP. It is important to note that while all of these different specifications use the same physical communication method and can operate on the same cable simultaneously, they cannot necessarily communicate with each other. For example, Modbus-TCP devices cannot communicate with Ethernet/IP devices because the messages and communication protocol have been defined differently for these systems, even though the physical electrical structure is the same.
 
TURCK Ethernet Overview
 
Basic Parts List
 
A typical system consists of the following parts:
• Power Supply
• Ethernet I/O modules
• Cables
• Switch
 
System Configuration
 
Ethernet I/O modules act as servers on a network. A client device is needed to retrieve data from and post data to the server. This is analogous to an office network, where the client PC on a user’s desk may actively connect with multiple servers to access information in different areas of the enterprise. TURCK industrial Ethernet stations are designed to be fully compatible with established Ethernet standards for industrial use. There are a variety of topologies that can be used for Ethernet configuration such as star topology, line topology and ring topology:
 
TURCK Ethernet Overview
 
Addressing
 
Industrial Ethernet stations use the IP addressing scheme. An address defined by this scheme consists of four byte values usually displayed in decimal form, for example, 192.168.1.254. Various classifications of networks require different portions of this address to be constant for all devices on the network (referred to as a “subnet”). This means that the number of stations allowed on a particular network varies depending on what class of subnet is being used. If the first three bytes of the IP address are constant (which is common), then the remaining byte may be addressed between 2 and 254, resulting in 253 possible addresses.
 
Maximum Ratings
 
Ethernet allows different maximum cable lengths depending on the type of cable being used. Generally, an Ethernet segment may be as long as 100 m, where 90 m must be solid core cable and the remaining 10 m can be stranded patch cords.
 
TURCK Ethernet Overview
 
Cordsets
 
TURCK offers a complete line of molded Ethernet cordsets to facilitate network installation, resulting in faster start-up and fewer wiring errors. Cables are available with stranded or solid-core conductors, and with or without shielding. Most TURCK Ethernet equipment uses the 4 or 8-pin (M12) eurofast® connector specifications. These connectors provide a tough, rugged seal and are IP67-rated. In some cases, (mainly in the control cabinet) a traditional RJ45 Ethernet connector needs to be used. TURCK provides RJ45 cordsets, as well as a variety of devices made to convert between RJ45 and eurofast connectors. TURCK cordsets for the Ethernet system are available in standard lengths, in addition to custom lengths through the company’s sales representatives.
 
TURCK Ethernet Overview
 
Diagnostics
 
Industrial Ethernet stations support diagnostics information, which is based on their complexity and functionality. The common ground for all devices is that they provide visual diagnostic information using either a pair of status LEDs called MOD and NET LEDs or a single combined MOD/NET LED. Industrial Ethernet stations may also include an embedded webserver that can be accessed by a web browser, such as Internet Explorer. This embedded webserver can be accessed to provide diagnostic information anywhere in the world. TURCK discrete IO modules provide diagnostic data as a part of input data map. Standard stations support group diagnostics, where a single alarm bit is set if any IO is faulted. Deluxe station support individual IO diagnostic data, including open wire and short wire alarm bits.
 
EtherNet/IP Overview
 
EtherNet/IP is a communication protocol supported by the ODVA and is designed for use in industrial automation and process control applications. It takes the Common Industrial Protocol (CIP) and implements it onto the foundation of Ethernet. CIP envelops a wideranging suite of messages and services for a variety of applications, including safety, control, configuration and information. Ethernet/IP provides users with tools to deploy standard Ethernet technology for industrial applications.
 
Supported Features:
• ACD – Address Conflict Detection – This supported feature will detect if another device on the network has the same IP address. If a conflict is detected, the device will go into a recoverable fault state and set the status LEDs to indicate a fault
• DLR – Device Level Ring – Device Level Ring (DLR) is a fault tolerant network allowing continuous system operation when a single fault occurs in the end node, its network interface or cable system. The adoption of an integrated Ethernet switch in the multiprotocol products allows support for DLR across all product families
• Quick Connect
 
Addressing Options:
• Rotary Mode – IP address is preconfigured
• Programmable
• Webserver
• Boot-P
• DHCP
 
Configuration Options:
• Generic Ethernet Device – Standard setup of Ethernet products in Logix 5000 that are not Rockwell made products
• EDS support – Contrologix v20 and Omron
• CIP Bridge – Allen Bradley PLCs only – This features allows total setup and configuration of supported multiprotocol products within the Rockwell software (Logix 5000)
• IO Assistant –This free software is a FDT/DTM based technology for engineering, configuring, commissioning and diagnosing multiprotocol products
 
PROFINET Overview
 
PROFINET is a communication protocol that was developed by Siemens and the PROFIBUS User Organization (PNO) based on the open Ethernet standard. PROFINET features a modular design structure allowing users to select the cascading functions including standard TCP/IP for applications not requiring real time performance, Real Time (RT) for applications requiring the transfer of critical information and Isochronous Real Time (IRT) for applications using functionality like motion control.
 
Supported Features:
• Fast start-up
• GSDML file support
• Topology detection support
• Automatic address assignment – LLDP
• GSDML function configuration
 
Addressing Options:
• Rotary mode
• PROFINET name assignment
• Programmable
• DNS-PGM – (x600)
• Webserver
 
Configuration Options:
• The PROFINET cordset line offers both M12 Ethernet D-coded and RJ45 connector options, allowing users the option to mix-and-match any connector combination to meet unique application needs
 
MODBUS TCP/IP Overview
 
Modbus TCP/IP is the Modbus RTU protocol with a TCP interface running on Ethernet. Modbus was originally designed by Modicon (Schneider Electric) and is now managed by the Modbus-IDA User Organization. TCP/IP refers to Transmission Control Protocol and Internet Protocol, which provides the transmission channel for Modbus TCP/IP messaging. Modbus TCP/IP is used often in the industrial environment due to its ease of deployment and maintenance, and because it was developed specifically for industrial applications. Modbus TCP/IP can be used with star, tree or line network topology and can be implemented with Ethernet technology that has been adapted for use in the industrial environment.
 
Supported Features:
• Bit register and function codes
• 6 parallel Modbus connections
• PACTWARE FDT/DTM configuration and mapping
• Embedded webserver for diagnostics and configuration
 
Addressing Options:
• Rotary mode – IP address is preconfigured
• Programmable
• Webserver
• Boot-P
• DHCP
 
Configuration Options:
• Controllers can be setup to communicate on standard Modbus networks using either of two transmission modes: ASCII or RTU
• Users select the desired mode, along with the serial port communication parameters (baud rate, parity mode, etc.), during configuration of each controller
 
TURCK Multiprotocol Overview
 
TURCK provides a complete line of industrial Ethernet products, including on-machine, in-cabinet, block, and modular I/O.  The most recent innovation is the Multiprotocol Industrial Ethernet concept. TURCK’s innovative approach to industrial Ethernet I/O makes moving from another protocol, or simply implementing a fieldbus for the first time, plug-in simple. TURCK’s Multiprotocol products are self- configuring and offer a seamless transition to Ethernet, whatever Ethernet that may be.
 
1 Device = 3 protocols
• Ethernet/IP, PROFINET and Modbus TCP/IP
• Gateway (slave) recognizes the master upon power-up and self-configures for master protocol
• Supports ODVA quick-connect and Device Level Ring (DLR)
• PROFINET options include: PROFINET RT, and PROFINET Fast Start-up (FSU)
• PROFINET IRT available in standard product configuration
• Embedded web server for device configuration and diagnostics