Siemens SIMATIC S7 System Manual page 142

Glossary
DP/DP Coupler
The DP/DP coupler is a device for coupling two PROFIBUS DP subnets required for ->
safety-related master-master communication between -> safety programs in different -> F-
CPUs in S7 Distributed Safety.
Two (or more) F-CPUs are involved in safety-related master-master communication via a
DP/DP coupler. Each F-CPU is linked to the DP/DP coupler via its PROFIBUS DP interface.
ES
Engineering System (ES): An engineering system is a PC-based configuration system that
enables convenient, visual adaptation of the process control system to the task at hand.
Expert
A system is generally approved, that is, the safety acceptance test of the system is usually
carried out by an independent expert (for example, from TÜV).
Fail-safe DP Standard Slaves
Fail-safe DP standard slaves are standard slaves that are operated on PROFIBUS with the
DP protocol. Their behavior must comply with IEC 61784-1:2002 Ed1 CP 3/1 and the
PROFIsafe bus profile. A GSD file is used to configure fail-safe DP standard slaves.
Fail-safe I/O Module
A fail-safe I/O module is an ET 200eco I/O module that can be used for safety-related
operation (in -> safety mode) in S7 Distributed Safety or S7 F/FH Systems fail-safe systems.
This I/O module is equipped with integrated -> safety functions.
These modules are equipped with integrated -> safety functions.
Fail-safe IO Standard Devices
Fail-safe IO standard devices are standard devices that are operated on PROFINET with the
IO protocol. They respond according to the standard IEC 61784-1:2002 Ed1 CP 3/3 and the
PROFIsafe bus profile in V2 mode. A GSDML file is used to configure them.
Fail-safe Modules
ET 200S and und ET 200pro modules that can be used for safety-related operation (->
safety mode) in the ET 200S distributed I/O system or the ET 200pro distributed I/O device.
These modules are equipped with integrated -> safety functions.
Fail-safe Systems
Fail-safe systems (F-systems) are systems that remain in a safe state or immediately switch
to another safe state when certain failures occur.
Glossary-4
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05