Siemens 6ES7231-5QA30-0XB0 SB 1231 Analogue Input Module

CPU - Central processing unit. The processing centre of computer programs. The faster the processor usually the faster the computer

Digital - A system that uses only 0s and 1s to transmit data

Analogue - A continuous signal in time with fluctuations in a measurable parametre to provide a signal

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