Functions of the IM 151/CPU
5-12
ET 200S Interface Module IM 151/CPU
A5E00058783-01
5.5 Clock
The IM 151/CPU has an integrated software clock.
Setting, Reading and Programming the Clock
You set and read the clock using the programming device (see the
STEP 7
) User
Manual) or program the clock in the user program using SFCs (see the
System
and Standard Functions
Reference Manual and Appendix C).
Features
The table below indicates the features and functions of the clock.
When you parameterize the CPU in
STEP 7
, you can also set functions such as
synchronization and correction factors (refer to the
STEP 7
online help system for
information on how to do this).
Table 5-7 Features of the Clock
Features
IM 151/CPU
Type Software clock
Manufacturer setting DT#1994-01-01-00:00:00
Backup Not possible
Operating hours counter 1
Behavior of the Clock When Power Is Off
At power on, the CPU clock continues from the time valid at power off.
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