CONTROLLER WITH PROGRAMMER FOR SELECIVELLY PROVIDING PROGRAMS TO OPERATE CONTROLLER

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.