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Hi All,
I would like to know how is implemented the mechanism of arbitrary variables initialization in a plc.
In S7 or 1131 I can declare a variable and initialize it at the same time; after its value is changed, at next restart, the plc is able to
re-set its initial value.
There is something like a double-buffer? or the programming system does encode a "bootsrap code" for the initialization?
In the first case is the right one, how small plcs (with poor memory) handle the problem ?
Tanks
Francesco
(Sorry for my bad english)
I would like to know how is implemented the mechanism of arbitrary variables initialization in a plc.
In S7 or 1131 I can declare a variable and initialize it at the same time; after its value is changed, at next restart, the plc is able to
re-set its initial value.
There is something like a double-buffer? or the programming system does encode a "bootsrap code" for the initialization?
In the first case is the right one, how small plcs (with poor memory) handle the problem ?
Tanks
Francesco
(Sorry for my bad english)