The purpose of this course is to introduce you to the various communication networks that can be used with RSLogix 5000. This session provides you with the opportunity to explore EtherNet, ControlNet, and DeviceNet networks, depending on the workstation you are using and the workbook you are using.
About Industrial Networks
Control Networks
- EtherNet/IP
-CIP On media that operate under TCP/IP
-Connecting remote equipment – ES
- ControlNet
-CIP On medium-speed media
-Connecting remote equipment – ES
Country Buses
- DeviceNet
-CIP On low-speed media
-Discrete final elements
- HART
-Intelligent Instrumentation, Low Speed
- Foundation Fieldbus
-Intelligent Instrumentation, High/Low Speed
- Profibus
-Intelligent Instrumentation, High/Medium Speed
About an EtherNet Network
- High efficiency in data transfer
-Increased Baud Rate (10Mb, 100Mb), use of switches (NOT hubs), full duplex data transmission to minimize the effects of message collisions.
- Use of commercial products and technology
-Common set of tools for installation and support
-Well-established and widely accepted network standards
-You can take advantage of the “web browsing” services in the products
- Transmission Medium Options
-Active Bus: supports a star topology
-High noise immunity (Fiber optic cabling)
-Bus expansion capability with the use of multiple switches (copper and fiber)
-Sealed (IP67) medium – emerging technology (led by RA)
About a ControlNet Network
- Deterministic and High Speed
-Deterministic data transfer – It is known when the data will arrive. (Scheduled services)
-Repeatability in data transfer – Transmission times are consistent even when equipment enters and leaves the network.
- Redundancy
-Availability of redundant transmission medium
-Processor Redundancy
○PLC-5 Hot Backup
○ControlLogix Processor Redundancy
- Ideal for harsh or heavy industrial environments
-High noise immunity (Coaxial cabling and fiber optics)
-Intrinsically safe media and products (Flex Ex, fiber optic repeaters)
- Passive Bus
-Nodes can join and leave without affecting the network
-Trunkline type topology“
About a DeviceNet Network
- Low Acquisition and Installation Costs
-Reduction of plant cabling (Entrance and exit cabling is eliminated)
-Shorter installation, start-up and maintenance times.
- Network Attributes
-The data flow is governed by the Producer/Consumer model.
-Ability to route with higher-level networks.
-Greater diagnostic capabilities of the devices.
-Plug & Play capabilities – Add or remove nodes on the fly.
-Optimized for handling small amounts of data
○8 bytes per message
○Supports message fragmentation for larger data sizes.
- Transmission medium (Options)
-Passive Bus: Nodes can enter and exit without affecting the network
-Sealed (IP67) and non-sealed (IP65) medium
-Low-cost flat cable
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