SMC Networks EX12 SCS Series Operation Manual page 22

○How to replace the EX121/122 Series SI unit
Removal
1. Loosen the mounting bracket screw.
2. Remove the SI unit by unhooking claw 2 then claw 1.
Mounting
1. Hook claw 1 to the upper side of the DIN rail and claw 2 to the lower side.
2. Tighten the mounting bracket screw, and fix the SI unit to the DIN rail. (Tightening torque: 0.6 Nm)
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No.EX※※-OMC0002-C