4.2.3 Memory management
The CPU has an integrated memory. Information about the capacity
of the memory may be found at the front of the CPU. The memory is
divided into the following parts:
n
Load memory 2Mbyte
n
Code memory (50% of the work memory)
n
Data memory (50% of the work memory)
n
Work memory 1Mbyte
– There is the possibility to extend the work memory to its max-
imum printed capacity 2Mbyte by means of a MCC memory
extension card.
4.2.4 Storage media slot
n
As external storage medium for applications and firmware you
may use a MMC storage module (
M
ulti
m
edia
c
ard).
n
The VIPA storage media are pre-formatted with the PC format
FAT16 and can be accessed via a card reader.
n
After PowerON respectively an overall reset the CPU checks, if
there is a storage medium with data valid for the CPU.
n
Push the memory card into the slot until it snaps in leaded by a
spring mechanism. This ensures contacting.
n
By sliding down the sliding mechanism, a just installed memory
card can be protected against drop out.
n
To remove, slide the sliding mechanism up again and push the
storage media against the spring pressure until it is unlocked with
a click.
CAUTION!
If the media was already unlocked by the spring mecha-
nism, with shifting the sliding mechanism, a just installed
memory card can jump out of the slot!
4.2.5 Battery backup for clock and RAM
A rechargeable battery is installed on every CPU 31xS to safeguard
the contents of the RAM when power is removed. This battery is also
used to buffer the internal clock. The rechargeable battery is main-
tained by a charging circuit that receives its power from the internal
power supply and that maintain the clock and RAM for a max. period
of 30 days.
Memory
VIPA System 300S CPU
Hardware description
Structure > Battery backup for clock and RAM
HB140 | CPU | 315-2AG13 | GB | Rev. 14-40
28
