Glossary
Fail-safe signal modules
334 Installation and Operating Manual, 01/2010, A5E00085586-10
F-CPU
An F-CPU is a fail-safe central processing unit that is approved for operation in
S7 Distributed Safety/S7 F/FH Systems
. The F-copy license for
S7 F/FH Systems
allows
users to operate the CPU as an F-CPU, that is, to execute a → safety program in this CPU.
The F-copy license is not required for
S7 Distributed Safety
. The F-CPU can also execute a
→ default user program.
F-I/O
Collective name for fail-safe inputs and outputs that are available in
SIMATIC S7
for
integration in the
S7 Distributed Safety
and
S7 F/FH Systems
F-systems. Available I/O:
● ET 200eco fail-safe I/O module
● S7-300 fail-safe signal modules (F-SMs)
● ET 200S fail-safe modules
● Fail-safe DP standard slaves
Frequency shift keying (FSK)
Data modulation technique suitable for data transport over standard lines. Two audio
frequencies are used in order to encode the binary "0" and "1" in the frequency range of 300
– 3000 Hz. In the → HART protocol, the FSK signal is transmitted over a current loop.
FSK
Frequency shift keying (FSK)
F-SM
→ Fail-safe signal modules
F-systems
→ fail-safe systems
HART
Highway Addressable Remote Transducer. HART is a registered trademark of the → HART
Communication Foundation.
HART analog modules
Analog modules that can perform → HART communication in addition to their analog value.
HART analog modules can be used as a → HART interface for HART field devices.
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