Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual page 302

Writing/deleting software security keys to and from the Motion CPU
By writing a security key to the Motion CPU, the execution of programs can be prohibited for Motion CPUs in which a different
key from that for the program file is written. A single security key can be written to multiple Motion CPUs. If writing a security
key, create a key at the "Security key management" screen beforehand, and then connect to the Motion CPU. (Security keys
can only be written or deleted when the Motion CPU is in the STOP status.) Refer to following for details on operation.
Help of MT Developer2
[Project]  [Security]  [Security Key Setting]
Window
Operating procedure
■Write procedure
1.
Select the security key to be written to the Motion CPU from "Name".
2.
Click the [Write] button from the [CPU] tab.
■Deletion procedure
1.
Click the [Delete] button from the [CPU] tab.
6 COMMUNICATION FUNCTIONS
300
6.2 Security Function