CONTROLLER AND CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To instantaneously recognize the control state of a controller, to accurately select the controller requiring monitoring/operations and to reduce the burdens of the operation of a plant. SOLUTION: This controller is constituted of a PID controller 101 an interface controller 102 and an operation device 103, a controlled variable is calculated by a prescribed arithmetic operation by process input from the plant in the PID controller 101 and a valve or the like is controlled. In this case, a guidance logic 8 judges the control state of 'under control', 'under standby', 'under holding' and 'manual operation', etc., from automatic/manual mode signals for control, a set variable(SV), a process variable (PV), a manipulated variable(MV) and the other logic signals and displays the judged result at a guidance display part 23.