There is no output signal after the signal isolator is added

The environment of the industrial site is complex, and we often encounter various problems. For example, the signal transmitted from the flow meter to the PLC is always interfered with, but after adding the signal isolator, we think the signal is stable, but we have no output signal. Why is this? The following signal isolator manufacturer Xiaobian to take you to understand.

    This condition is generally ruled out in two steps:

    1. Check whether the signal isolator is connected correctly.

    The signal isolator has misconnection protection, so there is no risk of product combustion when connected to the wrong line, but it certainly cannot be used normally. If the wiring error is checked, the wiring mode can be corrected, and the product will not be scrapped due to misconnection.

    2. If the wiring is correct, but there is no output, it is necessary to consider whether the wrong product is selected.

    If the flow meter has no independent power supply before adding the signal isolator, but provides the working power supply through the PLC, the signal isolator can not directly select the traditional 4-20ma input and output signal isolator, but choose the signal isolation with the output circuit, because the PLC input has the terminal voltage, otherwise there will be no output after adding the signal isolator.

The above is the introduction of the signal isolator manufacturer, I hope to help you. If you have any questions, you can contact our manufacturer.