The invention discloses a PLC-based optical cable sheath bump on-line detection alarm method and
system, and the method comprises the steps: presetting a permissible outer
diameter error, enabling an optical cable sheath to enter a bump test device center through a cable stabilizing device after the optical cable sheath is extruded and cooled, resetting the optical cable through a meter length
reset button when the optical cable is normal and meets the requirements, and providing a trigger
signal to obtain a standard size, effective optical cable detection is started, the defect
detector feeds back data of the detected cable
diameter to the field PLC in real time, the data is compared with a permitted error range
limit value for calculation, a bulge alarm pulse is sent out when the data exceed an upper limit, a narrow-neck alarm pulse
signal is sent out when the data is smaller than a
lower limit, then the data are transmitted to the main control PLC through the field PLC, the meter counting length is locked, and the defect position is determined; and
complete data of the whole optical cable is reserved. Through the mode, the instantaneous defects on the surface of the optical cable can be captured in real time, missing detection caused by response
lag or overlarge sampling interval is avoided, accurate synchronization of defect positions and meter counting information is achieved, and accurate and comprehensive
quality monitoring under high-speed production is guaranteed.