My name is Patrick Lecoanet
I am the author of Zinc.
Mail: lecoanet(at)cena.fr
An entirely different, but equally pertinent, meaning for PLC is "programmable logic controller" [L1 ]. As KBK has justly written, "PLC's and GPIO's [L2 ] - the bread and butter of a lot of Tcl'ers, including several Steves."