Production management system, production management apparatus and production management method for manufacturing line

A display device in a production management system for managing a production state of a manufacturing line, the display device comprising:

• a time display area for displaying a time at which a detection signal is first output by a detector after an activation of the manufacturing line;
• and
• one of:
• a main display area for indicating at least either one of a production efficiency for the manufacturing line, and a number of times of occurrence of an operation delay for each unit of production equipment arranged in the manufacturing line,
• a detailed display area for indicating detection pulse intervals representing reception time intervals of detection pulse signals, in a reception order of the detection pulse signals output from an operating state acquisition apparatus, as detailed information of the operation delay, or
• a detection pulse interval display area for indicating an input time of the detection pulse signals and the detection pulse intervals, wherein:
• the display device comprises the time display area and the main display area,
• the detector is retrofitted to be mounted on a production equipment disposed on the manufacturing line, or retrofitted to be disposed in a vicinity of the production equipment,
• the production efficiency is based, at least in part, on the detection signal output by the detector, and
• the number of times of occurrence of an operation delay is based, at least in part, on:
• a comparison of a pulse interval of the detection signal output by the detector with a first predetermined pulse interval and a second predetermined pulse interval, the first predetermined pulse interval indicating that the manufacturing line is in a stop state, and the second predetermined pulse interval indicating that the manufacturing line is in a delay state, and
• a determination, based on the comparison of the pulse interval of the detection signal with the first predetermined pulse interval and the second predetermined pulse interval, that the manufacturing line is in the delay state when the pulse interval is shorter than the first predetermined pulse interval and longer than the second predetermined pulse interval.