315-4PN33

5 Deployment CPU 315-4PN33
5.1 Assembly
Information about assembly and cabling:
Ä Chapter 3
‘Assembly and installation guidelines’ on page 17
5.2 Start-up behavior
After the power supply has been switched on, the CPU changes to
the operating mode the operating mode lever shows.
When the CPU is delivered it has been reset. After a STOP®RUN
transition the CPU switches to RUN without program.
The CPU switches to RUN with the program stored in the battery buf-
fered RAM.
n The accumulator/battery is automatically loaded via the integrated
power supply and guarantees a buffer for max. 30 days. If this
time is exceeded, the battery may be totally discharged. This
means that the battery buffered RAM is deleted.
n In this state, the CPU executes an overall reset. If a MMC is
plugged, program code and data blocks are transferred from the
MMC into the work memory of the CPU. If no MMC is plugged, the
CPU transfers permanent stored "protected" blocks into the work
memory if available.
n Depending on the position of the operating mode switch, the CPU
switches to RUN, if OB81 exists, res. remains in STOP. This
event is stored in the diagnostic buffer as: "Start overall reset
automatically (unbuffered PowerON)".
CAUTION!
After a power reset and with an empty battery the CPU
starts with a BAT error and executes an overall reset. 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.
Turn on power supply
Default boot procedure,
as delivered
Boot procedure with
valid configuration in
the CPU
Boot procedure with
empty battery
VIPA System 300SDeployment CPU 315-4PN33
Start-up behavior
HB140 | CPU | 315-4PN33 | GB | 14-43 38