S7 400H startup
S7 400H startup
(OP)
Hi,
shouldnt the PLC load its program at startup from the flash memory card if RAM is empty?
i.e After power loss without backuo batteries shouldnt it read from memory card since RAM is empty due to power loss.
tanks
shouldnt the PLC load its program at startup from the flash memory card if RAM is empty?
i.e After power loss without backuo batteries shouldnt it read from memory card since RAM is empty due to power loss.
tanks





RE: S7 400H startup
rybrk
RE: S7 400H startup
thanks
RE: S7 400H startup
The problem with this is that you can only re-write the memory card so many times (1,000,000?) before it is "worn-out". In my case a 1-hour update was sufficient, so the memory card should last for about 114 years. If you need to update your memory more frequently, periodic memory card replacement may be a factor in your equipment design.
If I understand your question correctly, then I believe this is the only way to solve the problem.
Nic Van Engen
Electrical Technician