Previously, we shared how to connect proximity switches to PLC input points. Of course, PLC input points can be used to connect to more than just proximity switches. In engineering applications, they are also frequently used to connect to the DO outputs of frequency converters and servo drives to display the status of their controllers. This week, we will mainly share how to connect PLC input points to the DO output terminals of frequency converters.
Inverters are equipped with DO output function to inform the controller of their operating status. Commonly used output functions include: frequency reached, fault alarm, undervoltage, etc. Generally, there are more than 2 DO outputs, and the output form is mostly NPN. Below, we will take the Yiwei UT500 series inverter as an example to give a brief introduction.
1. The UT500 frequency converter has two DO outputs, Y1 and Y2.
2. NPN output configuration, open collector
3. How to connect the DO output of the frequency converter to the input of the PLC in application?
The above explains the wiring between the DO output of the Yiwei UT500 series frequency converter and the PLC input, which is relatively easy to understand. In fact, some servo DO output circuits are similar to those of frequency converters, such as the Yiwei US200 series servo, which has 4 DO outputs. Common output functions include: servo ready OK, target speed reached, target position reached, zero speed detection, servo alarm, etc. The output type is open output, NPN open collector output. The output circuit is as follows:
The connection method between the US200 series servo and PLC input points is similar to that of the UT500 series frequency converter; please refer to the diagram above.
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