Siemens S5-135U/155U - Manual (Page 222)

5-82
System Manual
C79000-G8576-C199-06
5.9 376 Memory Submodules
This section provides a summary
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of the use of the 376 memory submodules in the 928B (up to -3UB12),
928 (up to -3UA12) and 922 CPUs,
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and of the technical specifications.
Note
You cannot use the memory submodule 376 for the CPU 928B from version
3UB21, nor for the CPU 928 from version 3UA21.
5.9.1 Technical Description
The 376 memory submodules serve as a storage medium for user programs
and user data. They contain UV-erasable CMOS EPROMs. 376 memory
submodules are available in the following capacities:
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16 Kbytes
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32 Kbytes
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64 Kbytes
The order numbers for the SIMATIC S5 memory submodules can be found in
the ordering information.
5.9.2 Notes on Operation
You program the 376 memory submodules off-line on the SIMATIC S5
programmers. The link to the PG is provided by the EPROM programming
interface integrated in the PG.
A description of EPROM programming can be found in the STEP 5 manual.
Use an adhesive label to cover the EPROM window (erasing window) after
programming.
!
Caution
CMOS memory submodules are destroyed by programming with the wrong
programming number. A list of valid order numbers (MLFBs) and
programming numbers can be found in your STEP 5 software in the EPROM
package.
Before inserting a 376 memory submodule in the module receptacle of the
CPU,
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set the CPU mode switch to STOP
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and switch off the PLC (Power Off).
376 memory submodules can be erased with a UV eraser. Before erasing,
remove the plastic cover and the adhesive label from the erasing window.
Ordering
Information
Programming
the Memory
Submodules
Inserting a
Memory
Submodule
Erasing a Memory
Submodule
CPUs, Memory Cards, Memory Submodules, Interface Submodules