Glockenspiel und programmable logic controller: was sie gemeinsam haben
- Schritt 1. Glockenspiel — hat als Teil — Pinned cylinder. Automatic carillons have a pinned drum.
- Schritt 2. Pinned cylinder — funktioniert wie — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
- Schritt 3. Punched card — wird verwendet in — Harvard Mark I. The program was read from punched tape and the data from punched cards.
- Schritt 4. Harvard Mark I — hat als Teil — Relay. The Mark I was electromechanical, built from relays.
- Schritt 5. Relay — entwickelte sich zu — Programmable logic controller. It replaced relay cabinets.