Carrilhão e programmable logic controller: o que têm em comum

1. Passo 1. Carrilhão — tem como parte — Pinned cylinder. Automatic carillons have a pinned drum.
2. Passo 2. Pinned cylinder — funciona como — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
3. Passo 3. Punched card — é utilizado em — Harvard Mark I. The program was read from punched tape and the data from punched cards.
4. Passo 4. Harvard Mark I — tem como parte — Relay. The Mark I was electromechanical, built from relays.
5. Passo 5. Relay — evoluiu para — Programmable logic controller. It replaced relay cabinets.

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