Before proceeding to connect the uSD card to the industrial controller, we must check that the uSD switch is correctly configured. We must check the communication switches and put the SD switch at OFF position (If your PLC has it) :
Connecting the card inside the arduino automation PLC
Look at the PLC and check where the cover hiding the SD connector is.
Put a screwdriver in the sockets and extract the cover. Be careful with the internal components: you could damage them.
Pick the SD card with a tweezer.
Locate the SD connector inside the programmable logic controller.
Introduce the SD card into the connector.
Put the cover again .
Basics: SD card in Arduino PLC for industrial automation