Siemens S5-135U/155U appendix Flash Eprom Cards

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.8374 Flash EPROM Cards

This section provides a summary

Sof 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

Sand of the technical specifications.

5.8.1Technical 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:

S256 Kbytes

S512 Kbytes

S1024 Kbytes

S2048 Kbytes

S4096 Kbytes

Ordering	The order numbers for the SIMATIC S5 memory cards can be found in the
Information	ordering information.

5.8.2Notes 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	System Manual
	C79000-G8576-C199-06