These machines may run unique software and by using the wrong code (or release) could cause risk to an operator or the machine itself. There may also be cases where it is necessary to interlock a PLC program to a specific memory card or CPU, especially in cases where there may be multiple, similar (but slightly different) machines. In others, its purpose may be to prevent unauthorized modifications to safety-related code, or activation of disabled options. In some cases, there may be valuable intellectual property they would like to protect. From time to time, we'll run across situations where a client believes it is necessary to lock down code on a PLC.
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