MACHINE/ELECTRICITY DISSIDENCE DETECTING DEVICE IN SEQUENCE CONTROL SYSTEM

摘要

PURPOSE:To shorten the time of maintenance work and to reduce labor by displaying the dissidence of objects to be controlled on the basis of current supply to a machine/electricity dissidence detecting circuit for a specific original position or an anti-original position. CONSTITUTION:A piston rod P2 of a cylinder S2 to be controlled is controlled so as to be moved and returned from an original position to an anti-original position by a sequence control circuit. The original position and the anti-original position are detected by respective detectors HLS2, RLS2. In the machine/electricity dissidence detecting circuit, machine/electricity dissidence detecting circuits MEC1, MEC2 for the anti-original position and the original position are wired like a ladder to detect the machine/electricity dissidence of the cylinder S2. When automatic operation is started under the state of machine/electricity dissidence, said detector HLS2 is not ON, so that a selenoid of the cylinder is not excited even if a keep relay is excited and an abnormal position is informed by a display relay M2 of said circuit MEC2.