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Make sure to externally shut off all phases of the power supply for the whole system before
mounting or removing a module. Failure to do so may damage the module.
(1) Online replacement of the power distribution module and/or the base module is not
available. When replacing either of the modules, shut off all phases of the external power
supply.
Failure to do so may result in damage to all devices of the MELSEC-ST system.
(2) The I/O modules and the intelligent function modules can be replaced online.
Since online replacement procedures differ depending on the module type, be sure to
make replacement as instructed.
For details, refer to the chapter of online module change in this manual.

Do not directly touch the module's conductive parts or electronic components. Doing so may
cause malfunctions or failure of the module.

Make sure to securely connect each cable connector. Failure to do so may cause malfunctions
due to poor contact.