Kitchen timer are what, $10?
I used this last time I brewed:
http://www.online-stopwatch.com/interval-timer/
The ASL-51 is only $33.50. Since I was buying the PIDs from Auber anyway, the shipping for the timer was negligible. I find a panel-mounted timer to be extremely helpful (almost necessary once you're used to using it) to the brewing process.
If you want your PLC to automatically dispense the hops or just remind you to add the hops an input from the brew kettle is required.i actually using a plc with a couple of internal timers and 1 digtal timer hooked up to 3 pid temp controllers for automation of a HERMS... i need to figure out how to do the hopping though...
Cheers,
ClaudiusB