ethernet/ip connections in a logix controller system
DESCRIPTION
A basic overview of how to determine the number of connections used in a Logix Controller system when communicating with Ethernet/IP.TRANSCRIPT
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Calculating Connections in an Ethernet/IP System
Doug BrockAutomation Engineer, Chattanooga
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What is the biggest consideration when designing your Ethernet/IP
system?
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What are the considerations when designing your Ethernet/IP system?
It’s not your only consideration, but one of the biggest is to make sure you pick a processor and Ethernet/IP module that has enough capacity to handle the number of devices you are connecting to the Ethernet/IP network. In order to do that you have to calculate the number of connections your system will use. This presentation covers a manual way and also an easy way to count your connections.
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What are the considerations when designing your Ethernet/IP system?
• Limits are set by capacity of Controller and network module
• Two types of connections – CIP and TCP
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What are the considerations when designing your Ethernet/IP system?
• Limits are set by capacity of Controller and network module
• Two types of connections – CIP and TCPA processor and a communication module use connections to establish the communication link between the controller and other devices such as local and remote I/O modules, HMIs, drives, etc… Also messages and produced/consumed tags use connections.
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• The best place to find a listing of the connection capacity of Logix controllers and network modules is in Rockwell Automation manual 1756-RM094_-EN-P.
(follow this link)
• Search by Publication Manual for 1756-RM094_-EN-P
• Look on page 14 of this manual.
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What are the considerations when designing your Ethernet/IP system?
• Limits are set by capacity of Controller and network module
• Two types of connections – CIP and TCP
Generally speaking every IP address is going to use a TCP connection and then it is also going to use one or more CIP connections.
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• The best place to find an explanation of what connections are and how they are used is in Rockwell Automation manual ENET-AP001D-EN-P.
(follow this link)
• Search by Publication Manual for ENET-AP001D-EN-P
• Start reading from page 15 of this manual.
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Performing the CalculationConnection Type
ExamplesDevice
QuantityX Connections
per Module= Total
Connections
Local Connections Local I/O Module
3 x 1 = 3
Remote Connections Remote Ethernet/IP Comms Module
2 x 1 = 2
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Performing the CalculationConnection Type Device
QuantityX Connections
per Module= Total
Connections
Local Connections Example:Local I/O Module
3 x 1 = 3
Remote Connections Remote Ethernet/IP Comms Module
2 x 1 = 2
This table is straight from the publication listed above (1756-RM094_-EN-P) on page 15. Fill out the sheet, multiply out the rows, and add up the last column. There is your total number of connections.
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Totaling Connections
So that is the manual way of determining how many connections your system uses. There is a much easier way. Rockwell Automation has a free software package called the Ethernet/IP Capacity Tool that will add up the connections for you. It will also give you an idea of how much overall bandwidth you are using in your system.
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Link to the download:
(Ethernet/IP Capacity Tool)
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Screen shot of Ethernet/IP Capacity Tool
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Screen shot of Ethernet/IP Capacity Tool
The tool is easy to use. Select your processor from the pull-down menu then add the devices that will be on your Ethernet/IP network. Click compute and the software gives you your total connections and other information.
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Ethernet/IP Capacity Tool Demo
I posted a simple and short demo of the Ethernet/IP Capacity Tool on YouTube. Here is the link:
http://www.youtube.com/watch?v=DnCaU_GdvpI
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That’s the down and dirty of calculating how many connections
your system requires on Ethernet/IP.
More information on Ethernet/IP is available on the Rockwell Automation
website at:
Ethernet/IP Resources