Siemens PLC is typically connected to an NPN-type switch, but if you replace it with a Mitsubishi PLC, does that mean it should be connected to a PNP-type switch? Let's break this down. A: Siemens PLCs can be either source type (PNP) or sink type (NPN), depending on the configuration. Here’s a quick explanation: 1. **Leakage Logic (Sink Type - NPN):** When current flows into the signal input terminal, the signal turns ON. This is called leakage logic because the current is "leaked" out through the output transistor, which has an NPN transistor characteristic. 2. **Source Logic (Source Type - PNP):** In this case, when current flows from the input terminal, the signal turns ON. The current is sourced from the terminal, and the output behaves like a PNP transistor. Let’s take a positive power supply as an example: - If the signal terminal sends an "ON" signal and the voltage is low (0V), it’s considered sink logic. - If the signal terminal sends an "ON" signal and the voltage is high (like 24V in most PLCs or inverters), it’s source logic. In short: - Source input is active high — current flows out from the input point. - Sink input is active low — current flows into the input point. Mitsubishi’s FX3U series supports both source and sink configurations, making it flexible for different applications. Understanding the difference between PNP and NPN is crucial when interfacing sensors, switches, or other devices with a PLC.
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