mcalidl
Member
Is there a way to retain bits or words in a power failure in the SLC500?
Retentive Memory SLC500
- Thread starter mcalidl
- Start date
geniusintraining
Lifetime Supporting Member + Moderator
mcalidl,
What are you trying or not trying to do? if you set a bit it will stay that way until you unlatch/reset it
By default the 'B' file is retentive
at least on the 504's I think the 500's are the same
What are you trying or not trying to do? if you set a bit it will stay that way until you unlatch/reset it
By default the 'B' file is retentive
at least on the 504's I think the 500's are the same
TConnolly
Lifetime Supporting Member
All memory in an AB PLC is retentive. It is the instruction that is used that will determine how the bit acts on power up or when going to run. Bits addressed by OTE instructions, non retentive timers, etc are reset during the prescan.
geniusintraining
Lifetime Supporting Member + Moderator
mcalidl said:
What file is the part number in? is it a interger? float?
TConnolly
Lifetime Supporting Member
Unless you have logic in your program that over writes the value in the address where the part number is stored on the first scan then the part number will still be there. Nothing changes in memory unless you tell it to change.
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