Beijer Electronics NA-9379 - Manual (Page 20)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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4. Mechanical Setup
4.3. Inserting and Removing the Module.
As above figure in order to safeguard the FnIO module from jamming, it should be fixed onto the DIN rail with locking
level. To do so, fold on the upper of the locking lever.
To pull out the FnIO module, unfold the locking lever as below figure.
Before work is done on the components, the voltage supply must be turned off.