Device CAL Requirement

By chris.christison ·
On our a couple of our manufacturing lines we are installing a Windows 2003 Server (I/O Server) that will be gathering data from the manufacturing line PLC?s and passing it along to our HMI PC?s and Reporting Server. The PLC?s are like a robot where they don?t have a user and are specifically used to control and report on the manufacturing process. They do transfer information to the I/O Server, which in turn pushed the information up. The I/O Server is essentially multiplexing the down line devices, however, they are not "computing" devices. Would the require a Device CAL?

If they do require a CAL, do Printers, switches and WAP's also require a CAL since they request and recive a DHCP address from a Windows Server?

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My Understanding

by retro77 In reply to Device CAL Requirement

Is that you only need CALs for Windows hosts. But when you buy Windows XP for the client, you are buying the CAL as well.

I havent messed with CALs since Windows NT4. I would say, no, printers and your PLCs do not require you to buy CALs.

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Interesting Question

by OH Smeg Moderator In reply to Device CAL Requirement

As far as I understand things from M$ they like money and use every opportunity to get as much as possible.

As for these devices I would imagine that Computer Robots making something are considered as Terminals as well as Network Printers which are defiantly a Computer or Microprocessor Controlled Device with it's own OS. Switches shouldn't require CAL's as they just push a connection through and allow more units to connect to the server so I would imagine that M$ allows these units free access without any interference but other Network Items would require a CAL if you have exceeded the limit supplied by the Server Application.

As far as Windows Licenses are concerned they currently Do Not equal to a valid CAL as you need the CAL, The working OS on the terminals and the Server OS to get the M$ system to work properly.

As this could be quite expensive is there an overriding need to use Windows Servers down line picking up the Data entry points? I would imagine that some Nix or BSD servers would do just as good a job and be far less expensive to setup.


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