Hitachi NJI-350B - Manual (Page 247)

Chapter 10 PLC Installation, Mounting, Wiring
10-2
Securing the unit
Secure the unit by installing DIN rail fixing brackets
from both sides. (The product may move out of place
if not secured with the fixing brackets.)
Removing the unit from the DIN rail
1]
2]
While lowering the DIN rail attachment mounting
lever 1], lift the unit upward to remove as shown by
2].
DIN rail attachment mounting levers
DIN rail attachment mounting levers