Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 222)

Glossary
CPU 31xC and CPU 31x, Technical data
Glossary-6
Manual, Edition 08/2004, A5E00105475-05
Error response
Reaction to a runtime error. Reactions of the operating system: It sets the automation
system to STOP, indicates the error, or calls an OB in which the user can program a
reaction.
ERTEC
See ASIC
Fast Ethernet
Fast Ethernet describes the standard with which data is transmitted at 100 Mbps. Fast
Ethernet uses the 100 Base-T standard.
FB
See Function block
FC
See Function
Flag bits
Flag bits are part of the CPU's system memory. They store intermediate results of
calculations. They can be accessed in bit, word or dword operations.
Flash EPROM
FEPROMs can retain data in the event of power loss, same as electrically erasable
EEPROMs. However, they can be erased within a considerably shorter time (FEPROM =
Flash Erasable Programmable Read Only Memory). They are used on Memory Cards.
Force
The Force function can be used to assign the variables of a user program or CPU (also:
inputs and outputs) constant values.
In this context, please note the limitations listed in the
Overview of the test functions section
in the chapter entitled Test functions, Diagnostics and Troubleshooting in the S7-300
Installation manual.
Function
According to IEC 1131-3, a function (FC) is a --> code block without --> static data. A
function allows transfer of parameters in user program. Functions are therefore suitable for
programming frequently occurring complex functions, e.g. calculations.