315-4PN33

4.2.4 Storage media slot
n As external storage medium for applications and firmware you
may use a MMC storage module (Multimedia card).
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.
CAUTION!
Please connect the CPU at least for 24 hours to the power
supply, so that the internal accumulator/battery is loaded
accordingly.
After a power reset and with an empty battery the CPU
starts with a BAT error and executes an overall reset. The
loading procedure is not influenced by the BAT error.
The BAT error can be deleted again, if once during power
cycle the time between switching on and off the power
supply is at least 30sec. and the battery is fully loaded.
Otherwise with a short power cycle the BAT error still
exists and an overall reset is executed.
VIPA System 300SHardware description
Structure > Battery backup for clock and RAM
HB140 | CPU | 315-4PN33 | GB | 14-43 28