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Disclaimer: This document is written in the hope that you can utilize for your own education to gain knowledge of PLC systems (should you decide to utilize this document). Although I believe the information in this document to be accurate, it is YOUR responsibility to verify this information before implementing it in any way, especially when damage to personnel or equipment could result. By continuing to read this document, you agree to hold no one who writes, modifies, or distributes this document liable in any way (even negligence). Due to the wide variety of plant applications, some of the examples in this document may be prohibited at your location, or could cause damage to equipment, or harm personnel.
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The Ethernet Module


Ethernet is a protocol that has been widely used for many years. Before Ethernet was used with PLC systems, it was used in Office environments for sharing files, printers, data from databases, etc... Ethernet is the fastest communication protocol available for the ControlLogix system with speeds up to 100 Mbps (Million bits per second). Ethernet can be used to communicate with the ControlLogix system from a computer, for communication between controllers, to allow the controller to communicate with I/O, Or MMI (man-machine interface) devices to communicate with processors.


Every device on Ethernet has a Unique hardware address which can usually be found on the device itself, or on a configuration screen for the device. This hardware address can be used to issue the ethernet module an address using a bootP utility. The hardware address will also scroll across the alphanumeric display if no IP address has been assigned.




Once the IP address is assigned, the IP will scroll across the alphanumeric display. This IP address can then be used in the Ethernet Driver for RSLinx, or if type the IP address into the address bar of a web browser, such as Mozilla, the modules on board web server will show the module's status, and the status of every other module in the chassis.




On the bottom of the 1756-ENBT module, you will find an RJ-45 port. Using a standard patch cable, you can connect the module to an Ethernet switch or a hub. To connect to your computer directly, you will need a crossover cable (switches transmit and receive).