Chapter 3 Deployment CPU 21x-2BM03
Manual VIPA System 200V
3-2
HB97E - CPU - RE_21x-2BM03 - Rev. 14/44
Assembly
Note!
Information about assembly and cabling may be found at chapter "Basics
and Assembly".
Start-up behavior
When the CPU is delivered it has been reset. After the power supply has
been switched on, the CPU changes to the operating mode the operating
mode lever shows. After a STOP
→
RUN transition the CPU switches to
RUN without program.
Note!
Due to a long storage of the CPU, the battery may be discharged
excessively. Please connect the CPU at least for 24 hours to the power
supply, to achieve the full buffer capacity.
The CPU switches to RUN with the program stored in the battery buffered
RAM.
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.
In this state, the CPU executes an overall reset because with an empty
battery the RAM content is undefined. If a MMC with a S7PROG.WLD is
plugged, program code and data blocks are transferred from the MMC into
the work memory of the CPU.
If there is no MMC, the project from the internal Flash is loaded.
Depending on the position of the operating mode switch, the CPU remains
in STOP respectively switches to RUN. Due to the battery error the CPU
can only boot if there was an OB81 configured. Otherwise a manual restart
(STOP/RUN) respectively PG command is necessary.
On a start-up with an empty battery the SF LED is on and thus points to an
entry in the diagnostic buffer. Information about the Event-IDs can be found
at "VIPA specific diagnostic entries".
Attention!
After a power reset and with an empty battery the CPU starts with a BAT
error and executes an overall reset.
Turn on power
supply
Boot procedure with
valid data in the
CPU
Boot procedure
with empty battery
