Mitsubishi Electric MELSEC L Series User Manual page 46

Do not slide modules from the edge of the DIN rail when mounting them. Doing so may damage the metal part located on the
back of the module.
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6.
Slide the modules and plug the connectors.
7.
Lock the module joint levers.
Slide the levers toward the back side of the module until
they click.
8.
Lock the DIN rail hooks and attach the DIN rail
stopper.
( Page 40, Section 6.2.2)