PLC debugging steps

Human brain is limited, and remember there are time-sensitive matter. N days will be forgotten after the reasons for every change, why should we increase the instructions, why do you want to delete this network, so look after their own programs written before will be very confused. Do the following steps to understand and modify all procedures would be of great help.
1, to save an existing program, the Save the procedures for amendment. Named one of the main program file name, marking the first several revisions, plus modified date, preferably outside in the file name changes with a brief caption. For example: "Banding Procedure 5 (06.10.23 flap stepping motor conditions)"
2, with. Doc file and date the record of changes.
3, record the date the following steps to modify the program, add or delete what directives. And in the process of editing the comment section to take notes to prepare for the next modification.
4,. Doc file, modify the program documented the reasons for the phenomenon of the breakdown of what the trouble is how to rule it out.
Five, in. Doc files are now marked by the modified procedure used by full name, including the date changes to the title and summary.
6, the date and the existing procedures available, the folder with the now outdated with the folder separate order, ordered by date.
Such changes made each time there is a detailed file, to facilitate future changes in procedures. The program is now marked with the date of the program recently.
This procedure also applies to the work of electrical drawings of the changes.

Updated:2010/6/29 13:07:37