Technical data
8.1 General technical data
8.1.2 Technical specifications of the Micro Memory Card (MMC)
Plug-in SIMATIC Micro Memory Cards
Memory modules available:
Table 8-1 Available MMCs
Type Order number Comments
MMC 4M 6ES7 953-8LM00-0AA0 -
MMC 8M 6ES7 953-8LP10-0AA0 Required for an operating system update
8.1.3 Clock
Features and functions
The following table contains the features and functions of the clock.
Table 8-2 Features and functions of the clock
Features Technology-CPU
Type Hardware clock
Factory setting DT#1994-01-01-00:00:00
Buffering By means of integrated capacitor
Buffered period Typically 6 weeks (at an ambient temperature of 40 °C)
Behavior of the realtime clock after
POWER ON
The clock continues running after POWER OFF.
Behavior of the clock on expiration of
the buffered period
The clock keeps running, continuing at the time-of-day it had
when power was switched off.
Information on..
• Synchronization and correction factor:
The CPU parameterization functions in
STEP 7
enable you to set functions such as
synchronization via MPI interface and correction factor. For further information, please
refer to the
STEP 7 online help
.
• Set, read and program the clock:
You can set and read the clock with the PG (see
Programming with STEP 7
manual).
You can also program the clock in the user program with SFCs (see reference manual
System and Standard Functions
).
S7-300 CPU Data: CPU 315T-2 DP
8-2 Manual, 12/2005, A5E00427933-02
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