Siemens SIMATIC ET 200S Installation And Operating Manual page 180

Glossary
Process image
The process image is a component of the system memory of the CPU. At the beginning of
the cyclic program, the signal states of the inputs are transferred to the process input image.
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 functional, electrical, and mechanical properties for a
bit-serial field bus system.
PROFIBUS is available with the following protocols: DP (= distributed I/O), FMS (= Fieldbus
message specification), PA (= Process automation), or TF (= Technological functions).
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 is implemented 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
A PROFINET IO controller is a device that is addressed via the connected IO device. 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
A PROFINET IO supervisor is a programming device/PC or HMI device used for
commissioning and diagnostics.
PROFINET IO controller with assigned PROFINET IO devices
PROFIsafe
Safety-related PROFIBUS DP/PA bus profile for communication between the -> safety
program and the -> F-I/O in an -> F-system.
Glossary-6
STEP 7
engineering tool.
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
STEP 7
, regardless of whether you
ET 200S Distributed I/O System - Fail-Safe Modules