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VMX Series Manual page 70 rev 1.06
Initializing Non-volatile Memory
The data sync feature can be used to initialize non-volatile memory values upon boot-up.
One way to do this is to use the reserved system variable N65529. This 16-bit variable is
always 0 whenever the system is booted up. After boot-up one bit is turned each second
starting from bit 0. See table below.
Time after boot-up (sec) N65529 value
0 0
1 1
2 3
3 7
4 15
5 31
6 63
7 127
8 255
9 511
10 1023
11 2047
12 4095
13 8191
14 16383
15 32767
16 65535
Therefore, using the N65529 variable we can initialize parameters over the first 16
seconds of boot-up.
For example, we can use the condition [N65529&1] to initialize some variables at time 1,
the use condition [N65529&2] to initialize some variables at time 2 and so forth.