4.2.6 Battery backup for clock and RAM
A rechargeable battery is installed on every CPU 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 maintained 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.
–
Please connect the CPU at least for 24 hours to the power supply, so
that the internal accumulator/battery is loaded accordingly.
–
Please note that in case of repeated discharge cycles (charging/
buffering) can reduce the buffer time continuously. Only after a
charging time of 24 hours there is a buffer for max. 30 days.
CAUTION!
–
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.
4.2.7 Operating mode switch
n
With the operating mode switch you may switch the CPU between STOP and RUN.
n
During the transition from STOP to RUN the operating mode START-UP is driven by
the CPU.
n
Placing the switch to MR (Memory Reset), you request an overall reset with following
load from memory card, if a project there exists.
VIPA System 300S
+
Hardware description
Structure > Operating mode switch
HB140 | CPU-SC | 313-5BF23 | en | 19-01
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