Understanding the difference between sink and source logic is crucial when working with industrial control systems. Let’s break it down clearly.
In simple terms, "leakage logic" refers to a situation where current flows through the signal input terminal, turning the signal on. Similarly, "source logic" also involves current flow into the input terminal, which activates the signal. However, these concepts can be confusing at first glance.
To simplify, consider the following: If the signal terminal sends an "ON" signal, and the voltage at that point is low (like 0V), this is known as sink logic. On the other hand, if the voltage is high (such as 24V in PLCs or inverters), it's called source logic.
Another way to look at it: Source inputs are active high, meaning current flows out from the input point. Sink inputs are active low, meaning current flows into the input point.
From a wiring perspective, source inputs require connecting the common terminal (1M and 2M) to M (which is 24V -). This allows current to enter the sensor via L+ (24V +) and then flow through the PLC's Ix.x terminal, returning to the common circuit internally. In contrast, sink-type inputs need the common terminal (1M and 2M) connected to L+ (24V +), so the current flows out of the PLC's Ix.x terminal, goes through the common terminal, enters the sensor, and returns to M (24V -).
When connecting different automation devices, it's essential to ensure their logic types match. For example, the S7-224 DC/DC/DC module uses source logic. If you're connecting it to a Mitsubishi FR-E500 inverter, the inverter should also be set to source logic. However, if you're using an AY40 output module from a Mitsubishi PLC to connect to the same inverter, the inverter must be configured for sink logic instead.
Always double-check the logic type before making connections to avoid potential issues and ensure proper system operation.
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