Siemens SIMATIC ET 200iSP Operating Instructions Manual page 469

Permanent wiring
All the elements carrying wiring (terminal modules) are installed on a mounting rail. The
electronic modules are inserted into the terminal modules.
PII
Process image inputs
Prewiring
Wiring the terminal modules before the electronic modules are inserted.
Process image
The process image is part of the system memory of the CPU (IO controller/DP master). At the start
of the cyclic program, the signal states of the input modules are transmitted to the process
image input. At the end of the cyclic program, the process image output is transmitted as signal
state to the ET 200iSP (distributed I/O).
PROFIBUS
PROcess FIeld BUS, process and fieldbus standard that is specified in the standard IEC 61158 Type
3. It specifies the functional, electrical and mechanical characteristics of a bit-serial fieldbus
system.
PROFIBUS is available with the following protocols: DP (= Distributed Periphery), FMS (= Fieldbus
Message Specification), PA (= Process Automation) or TF (= Technological Functions).
PROFIBUS address
For the purpose of unique identification on the PROFIBUS, each bus node must be given a
PROFIBUS address.
PCs and programming devices have the PROFIBUS address "0".
The ET 200iSP addresses 1 to 125 are permissible for the distributed I/O device PROFIBUS.
PROFINET IO
Communication concept for the implementation of modular, distributed applications within the
scope of PROFINET.
Pulse stretching
Function used to extend the duration of a digital input signal. It extends the signal at a digital
input by a set value.
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK
Glossary
469