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Technical Description
2.7.1
Backup Battery
The backup battery maintains the program and data when the S5-115U is switched off. The
backup battery has a service life of approximately two years.
After a lengthy storage period lithium batteries develop a passivation coating which is respon-
sible for the "voltage delay effect" (when the battery is loaded, the voltage drops temporarily to
under 3 V).
Before using a lithium battery in the power supply module, you should depassivate the battery by
loading it for two hours with 100 ohms.
Note
The safety regulations for hazardous materials must be observed when transporting
lithium
batteries!
2.7.2
Memory Submodules
There are three types of memory submodules with different memory capacities available for the
S5-115U:
Memory Submodule
Type
Capacity*
EPROM
8 Kbytes
EPROM
16 Kbytes
EPROM
32 Kbytes
EPROM
64 Kbytes
EPROM
128 Kbytes
EEPROM
8 Kbytes
EEPROM
16 Kbytes
****
RAM
8 Kbytes
****
RAM
16 Kbytes
****
RAM
32 Kbytes
*
2 Kbyte corresponds to approximately 1000 STEP 5 statements
**
Only 48 Kbytes can be used
***
Only 96 Kbytes can be used
** ** It is no longer necessary to use RAM submodules in the CPU 943 and CPU 944 since these CPUs provide the entire
memory capacity in the form of internal RAM.
2-28
Table 2-8. Available Memory Submodules
Cable Used
in CPU
941
942
943
**
***
Order Number
944
6ES5 375-1LA15
6ES5 375-1LA21
6ES5 375-1LA41
6ES5 375-1LA61
6ES5 375-1LA71
6ES5 375-0LC31
6ES5 375-0LC41
6ES5 375-0LD11
6ES5 375-0LD21
6ES5 375-0LD31
S5-115U Manual
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