Programmable controller
OwnerKei Yamamotoinventor
Life of this patent
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Abstract
Although a program created by a user for a conventional programmable controller has a security function using a password, there is a risk that the program is stolen due to leakage of the password. The programmable controller of the invention has a function of changing an arbitrary program created by a user, to a function, a function of transferring the user program in the function to a system memory of the programmable controller as a portion of a system program, a function of making the user program execute the user program in the function as the portion of the system program, a function of increasing a capacity of a user program area and efficiently using the user program area, and a security function of preventing information leakage by disabling perusal of the content of the user program in the function.
Claims3
A programmable controller comprising:
- a user memory for storing a user program created by a user and other data;
- a system memory for storing a system program;
- and
- means for changing a portion or a whole of an arbitrary user program created by the user, to a function.
A programmable controller comprising:
- a user memory for storing a user program created by a user and other data;
- a system memory for storing a system program;
- means for changing a portion or a whole of an arbitrary user program created by the user, to a function;
- means for transferring the user program in the function to said system memory as a portion of the system program;
- and
- means for making the user program stored in said user memory execute the user program in the function as the portion of the system program.
Dependencies are inferred from the claim text.