DamianInRochester
Lifetime Supporting Member
Are there any ideas on how to make a "reasonably" tamper proof running hour meter for a compact logix?
My OEM customer wants to base their machine warranty on "run" hours and not necessarily "power on" hours.
Maybe a simpler way to look at the problem is if it is possible to in some fashion make a tag value password protected such that I can write it inside say a locked AOI but noone outside can write to it?
Obviously there are other ways to get around it (replace the CPU, modify the program, etc.), but those at least require more effort than simply resetting a number. The more difficult it is the less apt they are to futz with it.
My OEM customer wants to base their machine warranty on "run" hours and not necessarily "power on" hours.
Maybe a simpler way to look at the problem is if it is possible to in some fashion make a tag value password protected such that I can write it inside say a locked AOI but noone outside can write to it?
Obviously there are other ways to get around it (replace the CPU, modify the program, etc.), but those at least require more effort than simply resetting a number. The more difficult it is the less apt they are to futz with it.