Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 215

Et 200s distributed i/o system - fail-safe modules
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Process image
The process image is part of the system memory of the CPU. At the start of cyclic program
execution, the signal states of the inputs are transferred to the process image of the inputs.
At the end of the cyclic program, the process output image is transferred to the outputs as
the signal state.
PROFIBUS
PROcess FIeld BUS, process and fieldbus standard specified in IEC 61784-1:2002 Ed1 CP
3/1. This standard specifies the functional, electrical and mechanical properties of a bit-serial
fieldbus system.
PROFIBUS is available with the DP (= distributed I/O), FMS (= fieldbus message
specification), PA (= process automation), or TF (= technological functions) protocols.
PROFINET IO
PROFINET IO is the PROFINET communication concept for implementing modular,
distributed applications.
PROFINET IO enables creation of automation solutions using the familiar, proven methods
of PROFIBUS.
PROFINET IO implementation is based on both the PROFINET standard for automation
devices and the
This means that you have the same application view in
are configuring PROFINET or PROFIBUS devices. Creation of your user program is similar
for PROFINET IO and PROFIBUS DP, provided you use the expanded blocks and system
status lists for PROFINET IO.
PROFINET IO controller
Device via which connected IO devices are addressed. That is, the IO controller exchanges
input and output signals with assigned field devices. The IO controller is often the controller
in which the automation program runs.
PROFINET IO device
A PROFINET IO device is a decentralized field device that is assigned to one of the IO
controllers (e.g. remote IO, valve terminals, frequency converters, switches)
PROFINET IO supervisor
Programming device (PD), PC or HMI device used for commissioning and diagnostics.
PROFINET IO controller with assigned PROFINET IO devices.
PROFIsafe
PROFIsafe is the safety-related PROFIBUS DP/PA bus profile for communication between
the -> safety program and the -> F-I/O in an -> F-system.
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
STEP 7
engineering tool.
STEP 7
, regardless of whether you
Glossary
215

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