Advantech ADAM-6050 18-Channel Isolated Digital I/O Modbus TCP Module ADAM-6050-BE Data Sheet
Product codes
ADAM-6050-BE
253
Appendix C
C.2.3 Normal Mode and Common Mode
Have you ever tried to measure the voltage between a live circuit and a
concrete floor? How about the voltage between neutral and a concrete
floor? You will get nonsense values. ‘Hot’ and ‘Neutral’ are just rela-
tional signals: you will get 110VAC or 220VAC by measuring these sig-
nals. Normal mode and common mode just show you that the Frame
Ground is the most important reference signal for all the systems and
equipments.
concrete floor? How about the voltage between neutral and a concrete
floor? You will get nonsense values. ‘Hot’ and ‘Neutral’ are just rela-
tional signals: you will get 110VAC or 220VAC by measuring these sig-
nals. Normal mode and common mode just show you that the Frame
Ground is the most important reference signal for all the systems and
equipments.
Figure C.4: Normal and Common Mode.
• Ground-pin is longer than others, for first contact to power system and
noise bypass.
• Neutral-pin is broader than Live-pin, for reducing contact impedance.