QUOTE(Nathan @ Jan 18 2008, 06:22 AM) [snapback]63963[/snapback]
What benefit do you gain from doing this?
With EVRSI, this is a little known fact but is clearly in Rockwell's documentation, as long as you map a shared drive, you can evmove the licenses onto the shared drive and all the PC's with that shared drive will share the licenses on a first-come, first-served basis. So this simple trick allows you to put unlicensed copies of RS-Logix 5/500/5000 on as many PC's as you want and they will all share the same license pool. You can even use the CHECKDRIVES system variable to designate drive order so for instance you can have a machine first check the floppy or local hard drive before going after the network licenses. No money has to be spent to get this feature.
With FTA, Rockwell priced everything to charge you for upgraded licenses to get this feature that existed already on the existing EVRSI (master disk) licensing model.
Benefit from floating licenses or from going to FTA?
Benefits of floating licenses:
#1: I have copies of RS-Logix on EVERY HMI PC in the plant. An electrician can pull up RS-Logix and do troubleshooting anywhere. The PLC's are appropriately passworded up to limit this to looking and not changing anything.
#2: I only need 4 licenses instead of 8 licenses for the major users (never mind the previously mentioned use which only amounts to 1 or 2 licenses).
Downsides:
#1: I maintain fixed licenses on one laptop for the few machines that aren't on the controls network and thus only accessible via RS-232 (channel 0) ports. They could be moved back and forth via evmove every time but this seems to be troublesome overall, especially with respect to the following problem (which disables this capability).
#2: Every so often, the file attributes get screwed up and all the licenses get locked down ("corrupted license file error") unless I reset the file attributes on the network license files. So I basically have to mark the files (or at least the attributes) read only to prevent corruption.
#3: Can't float PV+ programming software licenses.
Benefits of FTA:
#1: Can not only float licenses but temporarily "check out" a license...I don't need the special laptop licenses. This frees up the fixed licenses. I would theoretically be able to take advantage of this but the reality is that we're sending electricians to AB for training now so license pressure is going to be increasing, not decreasing.
#2: Have to convert the licensing scheme anyway before the next version in a couple years. When CPR 10 comes out, Rockwell won't support the EVRSI method anymore. Might as well get the pain over now.
#3: The "corrupted file" problem is a non-issue since it uses hardware keying instead of software-based.
#4: PV+ programming licenses float. This is one of the two reasons limiting PV+ proliferation in the plant.
#5: No master disks. No chance of a floppy (drive or disk) going bad.
Downsides of FTA:
#1: Cost. If it's node-locked, it doesn't matter. If you are already using the concurrent feature, it does. And the pricing is significant.
#2: This is an advantage to Rockwell but a disadvantage to a dishonest customer. Much harder to pirate licenses. With the master disk system, there are several ways to do it.