Processor AB PLC5/40
I have a PLC5 processor that is used to control a number of equipment such as roller mills etc. There are a few totalizers as well as equipment runtime meters etc. The data is stored as float and/or integer in assigned data tables.
If an offline upgrade was done to the equipment the programmer would have to record all the above data then download and update the relevant tables as they would have been replaced by the offline file. An error took place were I believe a program was downloaded into the processor and set all the values back two weeks (time of last upload).
I was wondering what would be the method(s) others have used to deal with this sort of issue, as well if there was someway of selecting some data tables to be write protected by program download.
I have a PLC5 processor that is used to control a number of equipment such as roller mills etc. There are a few totalizers as well as equipment runtime meters etc. The data is stored as float and/or integer in assigned data tables.
If an offline upgrade was done to the equipment the programmer would have to record all the above data then download and update the relevant tables as they would have been replaced by the offline file. An error took place were I believe a program was downloaded into the processor and set all the values back two weeks (time of last upload).
I was wondering what would be the method(s) others have used to deal with this sort of issue, as well if there was someway of selecting some data tables to be write protected by program download.