| 摘要 |
PCT No. PCT/JP84/00173 Sec. 371 Date Dec. 6, 1984 Sec. 102(e) Date Dec. 6, 1984 PCT Filed Apr. 6, 1984 PCT Pub. No. WO84/03964 PCT Pub. Date Oct. 11, 1984.A programmable controller having a memory for storing a sequence program in which messages are programmed with a processor for performing sequence control by successively executing the sequence program stored in the memory, and a display unit for displaying a ladder diagram corresponding to the sequence program of the memory as well as messages. The processor executes the sequence program and, when an alarm is sensed, causes the display unit to display a portion of a ladder associated with the alarm in accordance with alarm message data contained in the sequence program, thereby executing a rapid retrieval operation without relying upon the operator.
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