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Controller-with-programmer-for-selectively-providing-programs-to-operate-controller

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Controller with programmer for selectively providing programs to operate controller

Details

Inventors: Tachibana, Kouji;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A controller is provided with a programmer, and has a program memory and an arithmetic processing portion. The programmer has a key board with keys labeled with different computing elements, in instrumentation terms, necessary for determining the functions of the controller, and produces programs for forming control loops of desired functions in response to depression of the keys thereof and stores the programs in the program memory. The arithmetic processing portion is supplied with input data in digital form, and computes the input data in accordance with the program which is stored in the program memory. The program memory is capable of being selectively plugged into either the controller or the programmer.

DETAILED DESCRIPTION It is an object of this invention to provide a controller capable of easy modification and change by operators in the field of process control so as to form a desired control loop.
According to this invention, the controller body is provided with a programmer device capable of specifying and changing a desired program in response to the request of an operator.
In addition, the key board of the programmer has keys labeled with letters corresponding to the different computing elements necessary for determining the function of the controller, in instrumentation terms which are understandable with ease by the operator in the field.
Thus, the operator in the field can easily produce programs for forming a desired control loop by key operation of the programmer as if he operated an electronic desk-top calculator.

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