Siemens CPU 312 IFM User Manual

CPUs
1-11
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Behavior of Clock in POWER OFF Mode
The following table shows the clock behavior with the power of the CPU off,
depending on the backup:
Backup CPU 314 to 318-2 CPU 312 IFM and 313
With
backup
battery
The clock continues to operate in
power off mode.
At POWER ON, the clock continues
to operate using the clock time at
which POWER OFF took place.
With
accumulator
The clock continues to operate in
power off mode for the backup time
of the accumulator. When the power
is on, the accumulator is recharged.
Since the clock does not have a
power buffer, it does not continue to
run in POWER OFF mode.
In the event of backup failure, an
error message is not generated.
When the power comes on again,
the clock continues at the clock time
at which the power went off.
None At POWER ON, the clock continues
to operate using the clock time at
which POWER OFF took place.
Since the CPU is not backed up, the
clock does not continue at POWER
OFF.
1.2 Communication Options of the CPU
The CPUs offer you the following communication options:

Siemens CPU 312 IFM Specifications

General

Brand	Siemens
Model	CPU 312 IFM
Category	Controller
Language	English