July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH034.3D – 344 – [344–369/26]
19.6.2004 9:23PM
34
Analogue to digital conversion
FX2N-4AD
34.1 Introduction
In process control systems many of the input signals are from analogue type devices
known as transducers. Transducers are used to provide a voltage or current signal
proportional to the measured value of, for example:
(a) Mass
(b) Linear/angular movement
(c) Velocity
(d) Temperature
(e) Pressure
(f) Strain.
Therefore before a signal from a transducer can be used by a PLC, it has to
be converted into a digital quantity, using an analogue to digital converter – ADC.
The type of ADC, which will be used in this section, is the Mitsubishi FX2N-4AD.
The FX2N 4ADC can be used with the following ...
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