TIA Portal contains three different options for code protection: As I have a 1214C PLC sitting here on my lab bench, I'm going to use the S7-1200 platform as an example however, these options could be enabled on other PLCs (such as the 1500 series) as well. Luckily, there are tools available within TIA Portal for all of these cases, and it doesn't take more than a few minutes to set them up. 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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