Siemens S7-400 Installation Manual page 297

Error Display
Error display is one of the possible responses of the operating system to a run-time
error. The other possible responses include: error response in the user program,
STOP mode of the CPU.
Error Handling via OB
When the operating system detects an error (for example, STEP 7 access error), it
calls the specific organization block (error OB) for this error, where the further
response of the CPU can be specified.
Error Response
Response to a run-time error. The operating system can respond to the following
types: transferring of the programmable controller to STOP mode, calling of an
organization block where the user can program a response, or displaying of the
error.
Expansion Module
The expansion module of M7-400 is connected with the CPU via an ISA bus
interface and accommodates up to three interface submodules.
F
FB
³ Function Block
FC
³ Function
Flash EPROM
With regard to their characteristic to retain data in the case of a power failure,
FEPROMs correspond to the electrically erasable EEPROMs, but can be erased
much faster (FEPROM = Flash Erasable Programmable Read Only Memory). They
are used on the memory cards.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Glossary
Glossary-5