| 摘要 |
PURPOSE:To unify centralized management and control of control information by performing the centralized control of plural analog operation components to substitute a control circuit in each analog operation component with one hardware. CONSTITUTION:A RAM where data corresponding to analog IN channels of the drum rotative speed, the temperature of a fixing roll, etc. are stored is provided in the interface of an analog input port 32 in a controller 30 of a copying machine to discriminate the magnitude of a preliminary set reference value independently of processors 36 and 37. If this reference gets out of a certain range as the discrimination result, an internal interruption occurs in the processor 37. The processor 37 checks input data and an interruption channel for this interruption and gives a specific micro instruction to the macro code processor 36. A controlled variable which keeps a variable to be controlled at a target value is operated at a highs speed, and the result is outputted to, for example, a PWM output port. |
