CIG University III - 19991 How to select which network or networks ?

CIG University III - 1999 1

How to select which networkor networks ?

NetLinx Offers Flexible Options

EtherNet/IP

DeviceNet

ControlNet

EtherNet/IPDeviceNet

EtherNet/IPControlNet

ControlNetDeviceNet

Mix and Match

to fit your

application!

DeviceNet ControlNet EtherNet/IP

Application No. 1

Application No. 2

Application No. 3

Application No. 4

Application No. 5

Application No. 6

Network Positioning

EtherNet/IP Past/Present: Link to MES/ERP, Used for Programming, Controller to HMI, Some Controller to Controller, Present/Future: Present functionality, Controller to HMI, Controller to Controller Communications, and I/O. Backbone for lower-level networks.

ControlNet Past/Present: Backbone, I/O, Controller to Controller, Controller to HMI,

Programming, Information MessagingPresent/Future: High-performance, robust, secure network primarily for I/O

and interlocking. Backbone for lower-level networks.

DeviceNet Past/Present: Simple distributed I/O devices, HMI, and 3rd Party devicessupporting configuration and diagnostics

Present/Future: Present functionality and make it easier to user whileproviding lower node / installation / maintenance cost

Strengths of DeviceNetStrengths of DeviceNet• Lower Acquisition and Installation Cost

– Reduction in plant wiring (eliminates hardwiring of I/O)– Lower installation, start-up, and maintenance times

• Network Attributes– Data flow is governed by the Producer/Consumer model– Ability to link smart factory floor devices together– Ability to bridge to higher level networks– Superior device level diagnostics– Device Plug and Play capabilities - add or remove nodes on the fly– Optimized to handle small amounts of data

• 8 bytes per message• supports message fragmentation for larger data sizes)

• Media Options– Passive bus media: nodes can enter and leave without affecting the network– Sealed (IP67) and unsealed (IP65) media– Low cost flat media

Strengths of ControlNetStrengths of ControlNet• High Speed Determinism

– Deterministic data transfer - know when the data will arrive (Scheduled services)– Repeatable data transfer - transmission times are consistent as devices enter and

leave the network• Redundancy

– Redundant media is available– Processor redundancy

• PLC-5 Hot Backup• ControlLogix Processor Redundancy

• Industrial Hardened Physical Media– High noise immunity (coaxial and fiber optic cabling)– Intrinsically-safe media and products (Flex Ex, fiber optic repeaters)– Sealed (IP67) media currently being developed

• Passive Media– Nodes can enter and leave without affecting the network– Trunkline topology

Strengths of EtherNet/IPStrengths of EtherNet/IP• Highly efficient data transfer

– Increased baud rates (10Mb, 100Mb), use of switches (instead of hubs), full duplex data transmission to minimize effect of message collisions, and isolation from the office Ethernet network

• Use of commercial off the shelf products and technology– Common set of installation and support tools– Well established network standard, acceptance rate should be favorable– Can take advantage of web browsing services in the products

• Media Options– Active bus media: supports star network topologies– High noise immunity (fiber optic cabling)– Extend bus length with multiple switches (copper and fiber)– Sealed (IP67) media - emerging technology (Consortia lead by RA)

General Network Selection Guidelines

• EtherNet/IP – more complex devices and larger I/O count blocks and racks where a combination of medium to high performance I/O and a large amount of messaging is required

There is no absolute answer!

• DeviceNet – simple distributed devices and small I/O count blocks installed along side electrical/mechanical equipment

• ControlNet – more complex devices and larger I/O count blocks and racks where highly deterministic I/O performance with some messaging is required

Network Selection Criteria

• Application complexity• Topology

– Number of nodes– Length– Layout

• I/O Densities• Product Availability

– From multiple vendors– Device Types

• Performance• Media options

– Copper– Fiber– Power

• Cost

• Technology • MTTR• Bridging/Routing ability• Configuration• Diagnostics

– Network– Node

• Training• Support capability• Troubleshooting Tools• Supporting organization(s)

– Consortia– Companies

• Standardization

““From the Internet to DeviceNet”From the Internet to DeviceNet”““From the Internet to DeviceNet”From the Internet to DeviceNet”

EtherNet/IPInformation

Discrete Device

Automation and Control

Process Device

NetLinx Architecture - Summary

• Based on open networking standards

• Global multi-vendor support • Utilizes the

Producer/Consumer communication model

• Consistent set of services that are media independent

• Open connectivity throughout the manufacturing enterprise

ControlNet

DeviceNet