Features Of The Clock - Siemens SIMATIC ET 200S Manual

Functions of the IM 151-7 CPU
8.6 Clock
The IM 151-7 CPU has an integrated hardware 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 Instruction list).
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 via the MPI interface and correction factors (refer to the STEP 7
online help for information on how to do this).
Table 8-11 Features of the clock
Type
Manufacturer setting
Backup
Backup time
Run-time meter
Behavior of the clock when power is off
The clock of the CPU continues to run after the power has been switched off.
When the backup time has expired, the clock begins to run at the time at which the
power was switched off.
8-28
Features IM 151-7 CPU
Hardware clock
DT#1994-01-01-00:00:00
By means of integrated capacitor
Typ. 6 weeks
(at ambient temperature of 40 °C)
1
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04