Patent ID: 6556405
Filing Date: 2003-04-29
Classification: G05B

Abstract:
A programmable controller comprising a power source module, a CPU module, an input module and an output module,an output circuit portion provided in said output module, a latch circuit constituted by a flip-flop circuit, a current detection portion for detecting a current flowing in said output circuit portion, a reference voltage variation portion to vary a reference voltage of a comparator circuit for comparing said reference voltage with a voltage of said current detection portion, an overcurrent control circuit portion for supplying an interruption signal to said output circuit portion when a detected current value exceeds a predetermined value, and an overcurrent indication portion for operating synchronously with said interruption signal, wherein said output circuit portion interrupts an overcurrent at the time of an overcurrent, said reference voltage variation portion varies continuously a value for overcurrent interruption, and the overcurrent interruption is indicated on said overcurrent indication portion.