| 摘要 |
PURPOSE:To reduce the input error by displaying maintenance terminal display data before change or correction and that after change or correction with characters in contradistinction to each other in case of change or correction of maintenance terminal display data. CONSTITUTION:A key corresponding to maintenance terminal display data to be changed or corrected is inputted from a maintenance terminal 1, and a search means 6 searches a data address table 5 to obtain storage position information of maintenance terminal display data. A read/write means 7 writes storage position information in an address part 8a of a data editing buffer 8 and writes maintenance terminal display data of a main memory 3 in a new image part 8b and an old image part 8c of the data editing buffer. A write means 9 rewrites contents of the new image part 8b in accordance with the operation on the maintenance terminal 1, and a display control means 10 displays contents of the new image part 8b and the old image part of the data editing buffer 8 with characters on the maintenance terminal 1. Thus, data is easily changed or corrected without error.
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