Retentive Ranges interface
By default, all M, T, V, and C storage areas are set to remain.You can
redefine the scope and set some storage areas to non - hold.You can define
the six holding range, select the storage area you want to keep.You can
define the address holding range in the following storage areas. As the
following: V, M, C, and T. For timers, only the memory timer (TONR) can
be kept, and only the current value of the timer and the counter can be
kept. Timer and counter bits are cleared .
All the variables in the retentive ranges are saved permanently.PLC can
hold up to 800 bytes.
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