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S5-95F
18.5
Memory Submodules for Safety Mode
The S5-95F operates in safety mode only when the user program is stored on an EPROM
submodule. The table below lists the permissible memory submodules.
Submodule Type
EPROM
EPROM
EPROM
EPROM
EPROM
EPROM
Note
For operation with memory submodules you always requrietwo identical memory
submodules. Make sure that both submodules have the same order number.
18.6
Function of the Backup Battery
A backup battery is absolutely necessary for S5-95F operation. The battery is required to maintain
the contents of RAM if the power should fail and when the subunits are switched off.
The S5-95F monitors the state of its battery. If the battery charge falls below a certain value during
operation, the S5-95F writes a message to the system event DB and subsequently processes OB34
at the beginning of every cycle. If the battery is not replaced within 72 hours, the S5-95F goes to
STOP so as not to impair its failsafety.
As soon as the battery no longer has sufficient backup capacity, the red battery failure display at the
front of the basic unit lights up. When the battery failure display is lit, you can only start the S5-95F
by switching the power switch from OFF to ON and then switching from STOP to RUN.
For reasons of safety the S5-95F automatically performs an overall reset and copies the contents of
the memory submodule into the internal RAM.
Replacing the Backup Battery
Do not wait until the S5-95F indicates that it is time to change the battery; simply replace it every
year as a preventive measure.
Safety Note
Battery replacement while the PLC is at RUN is not allowed in installations which fall
under the authority of BIA/BG. In all other installations, replacement of a battery while
the PLC is at RUN is permitted only in conjunction with careful observation of the
guidelines relating to electrostatic sensitive devices (see Appendix D).
EWA 4NEB 812 6210-02
Table 18-3. Overview of EPROM Submodules
Submodule Order No.
6ES5 375-0LA15
6ES5 375-0LA21
6ES5 375-0LA41
6ES5 375-1LA15
6ES5 375-1LA21
6ES5 375-1LA41
Rules for Failsafe Operation of an S5-95F
Capacity
Programming No.
8 Kbytes
16 Kbytes
32 Kbytes
8 Kbytes
16 Kbytes
32 Kbytes
11
12
17
411
412
417
18-13
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