Mitsubishi PLCs are classified as source-type (PNP) or sink-type (NPN). The following are their differences.
1. Sinking Logic: When current flows out of the signal input terminal, the signal becomes ON, which is sinking logic. The current flows in from the terminal and has the output characteristics of an NPN transistor.
2: Source-type logic: When current flows into the signal input terminal, the signal becomes ON, which is source-type logic. The current flows out of the terminal, exhibiting the output characteristics of a PNP transistor.
Taking a positive power source as an example:
When the signal terminal announces the "ON" signal, if its voltage is low (0V) at this time, it is a sink logic;
When the signal terminal announces the "ON" signal, if its voltage is high (generally 24V for PLCs, frequency converters, etc.), then it is source logic.
Source input is active high, meaning current flows into the input point; sink input is active low, meaning current flows out of the input point.
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