212 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 10 Commercial Operating System
Clock Synchronization with Logix Control Engine
The wall clock time of the controller is copied to the COS at controller power-
up. However, controller power-up is the only time it is copied.
The Logix control engine and the COS clocks are independent. Over time
there is drift between the clocks.
If you set it in the COS, it is not persistent across power cycle.
Functions Like a Computer
The COS is an industrial computer that supports the following actions:
• The COS performs Windows-based computing and has the same
reliability as other Windows-based products.
• The installation and use of third-party software applications.
• Installation and use of Rockwell Automation® applications that are used
with a Logix 5000â„¢ control system.
For example, you can install and run the following applications from the
COS:
– FactoryTalk® Linx software
– FactoryTalk View SE Station software
• You can transfer data between the COS and the Logix control engine.
• You can use ports on the bottom of the controller to make connections
that are typically made with a computer. For example, you can connect a
wireless mouse and keyboard to the controller instead of to a computer.
For more information on how to use the ports that are dedicated to the
COS, see
Ports Dedicated to Windows-based Activities on page 214.
TIP If you are not using the COS, consider shutting it down because there is no
benefit to running the COS if it is not in use.
There are benefits to shutting down the COS if you are not going to use it,
though. For example, less power is consumed and there is a reduction in the
heat that is generated.
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