Flash Eprom Cards; Technical Description; Notes On Operation - Siemens S5-135U/155U System Manual

CPUs, Memory Cards, Memory Submodules, Interface Submodules
5.8

374 Flash EPROM Cards

This section provides a summary
5.8.1

Technical Description

The 374 memory card serves as a storage medium for user programs and user
data. It contains electrically erasable flash EPROMs.
The 374 memory card is available in the following capacities:
Ordering The order numbers for the SIMATIC S5 memory cards can be found in the
Information ordering information.
5.8.2

Notes on Operation

Programming a You can program and erase the 374 memory card off-line on the SIMATIC S5
Memory Card
programmers. The link to the PG is provided by a special connector or
programming adapter, into which the memory card is inserted. A description
of EPROM programming can be found in the STEP 5 manual.
Inserting and
Memory cards can be inserted and removed at any time, even whilst the CPU
Removing a
is running, as long as they are not being accessed (see the CPU 948
Memory Card
Programming Guide).
Loading Data The contents of the memory cards are only copied automatically into the
internal RAM of the CPU upon overall reset of the CPU.
Erasing a Memory
Memory cards are electrically erasable.
Card
5-80
of the use of the 374 flash EPROM cards (known as the 374 memory
cards in the following) in the CPU 948, CPU 928B-3UB21 and
CPU 928-3UA21
and of the technical specifications.
256 Kbytes
512 Kbytes
1024 Kbytes
2048 Kbytes
4096 Kbytes
System Manual
C79000-G8576-C199-06