Power Separation Installation Case
The following photo was taken at a customer site, showcasing a case where the power supply for the HMI and control board was separated and applied individually.
Key Features:
- Ferrite core attached to the communication cable.
- Thicker power cables used, with ferrite cores also attached.
- Dedicated SMPS for the HMI (Panel PC).
- Separate SMPS for the control board.
- Control board.
The reason for separating the power supply is to prevent both systems from being affected simultaneously by noise or surges.
For example, if the HMI is attacked by noise or a surge and becomes unresponsive, the control board will remain unaffected as long as their power supplies are separate.
The same applies in the opposite scenario—even if the control board experiences an issue due to noise or surges, the HMI will continue to function normally.
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There is also a way to separate the power supply like this:
You can group the PLC/HMI under one power source and use a different power source for the I/O.
This way, even if a power short occurs on the I/O side, the PLC/HMI will not be affected.
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