Is the statement true or false? The power supply located in the chassis or backplane should only be used to power the PLC modules.

The statement is true because the power supply located in the chassis or backplane of a PLC (Programmable Logic Controller) system is specifically designed to provide the necessary voltage and current to the PLC modules installed within that same chassis or backplane. This design ensures that all the connected modules receive a stable and regulated power source, which is critical for their proper operation.

Using this power supply solely for the PLC modules helps maintain system integrity and reliability, as the components are engineered to work together under the same power specifications. If external devices were connected to the same power supply, it could lead to voltage drops, noise, or interference that might negatively affect the performance of the PLC modules. Thus, the best practice is to restrict the power supply use to powering the modules housed in the same chassis or backplane.