Technical data
Appendix
27.1 Operating Modes
Programming with STEP 7
564 Manual, 05/2010, A5E02789666-01
The following table shows the data that are retained on work memory (EPROM and RAM load
memory):
EPROM (Memory Card or Integrated)
CPU with Backup Battery CPU without Backup Battery
Data Blocks in
load
memory
DB in
work
memo-
ry
Memory
bits, timers,
counters
Memory
bits,
timers,
counters
Blocks in
load
memory
DB in
work
memory
DB in
work
memory
Memory
bits,
timers,
counters
Memory
bits,
timers,
counters
(defined as
retentive)
(defined
as
volatile)
(defined
as re-
tentive)
(defined
as
volatile)
(defined
as re-
tentive)
(defined
as
volatile)
Warm
restart
on
S7-300
X
X
X
0
VC
VX
V
X
0
Warm
restart
on
S7-400
X
X
X
0
VC
---
V
0
0
Cold
restart
on
S7-300
X
0
0
0
VC
V
V
0
0
Cold
restart
on
S7-400
X
0
0
0
VC
---
V
0
0
Hot
restart
on
S7-400
X
X
X
X
Only
warm
restart
per-
mitted