| 摘要 |
PURPOSE:To analyze easily the cause of an abnormal processing by printing out only the history of execution with which an abnormal state is through. CONSTITUTION:A controller 1' sends the career data to a history memory 4' via a data bus 3 for each execution of an instruction and delivers a command for storage with a history output signal 12'. When the execution is through normally with a series of instructions, the controller 1' sends a normal end signal 14' to a history print controller 2' to inform that the unit control is normal. When an abnormality is detected during the execution of an instruction, the controller 1' sends an abnormal end signal 15' to the controller 2'. Then the controller 2' gives a command to the memory 4' to read out the execution history of instructions following an immediately preceding control start signal 16'. The history of execution is read out via the bus 13' and printed by a history printer 3'. |
