Siemens SIMATIC ET 200SP Informasi Produk - Halaman 33

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Fail-safe modules

ET 200SP modules with integrated safety functions that can be used for safety-related

operation (safety mode).

Fail-safe systems

Fail-safe systems (F-systems) remain in a safe state or immediately assume another safe

state as soon as particular failures occur.

Fault response time

The maximum fault response time of an F-system defines the interval between the

occurrence of any fault and a safe reaction at all affected fail-safe outputs.

For → F-systems overall: The maximum fault response time defines the interval between the

occurrence of any fault at any → F-I/O and the safe reaction at the corresponding fail-safe

output.

For digital inputs: The maximum fault response time defines the interval between the

occurrence of the fault and the safe reaction at the backplane bus.

For digital outputs: The maximum fault response time defines the interval between the

occurrence of the fault and the safe reaction at the digital output.

Fault tolerance time

The fault tolerance time of a process is the time a process can be left unattended without risk

to life and limb of the operating personnel, or damage to the environment.

Any type of F-system control is tolerated within this fault tolerance time, i.e. the → F-system

can control its processes incorrectly or even not at all. The fault tolerance time depends on

the type of process and must be determined on a case-by-case basis.

F-CPU

An F-CPU is a central processing unit with fail-safe capability that is permitted for use in

SIMATIC Safety. A standard user program can also be run on the F-CPU.

F-I/O

Collective name for fail-safe inputs and outputs available in SIMATIC S7 for integration into

the SIMATIC Safety F-system. Available F-I/O modules:

● Fail-safe I/O module for ET 200eco

● Fail-safe signal modules S7-300 (F-SMs)

● Fail-safe modules for ET 200S

● Fail-safe modules for ET 200SP

● Fail-safe DP standard slaves

● Fail-safe PA field devices

● Fail-safe IO devices

ET 200SP distributed I/O system

Product Information, 07/2013, A5E32288220-AA

Glossary