Siemens SIMATIC S7-1500 Function Manual page 52

IO controller, PROFINET IO controller
Central device in a PROFINET system, usually a classic programmable logic controller or
PC. The IO controller sets up connections to the IO devices, exchanges data with them and
thus controls and monitors the system.
IO device, PROFINET IO device
Distributed I/O device of a PROFINET system that is monitored and controlled by an IO
controller (e.g. distributed inputs/outputs, valve blocks, frequency converters, switches).
IRT
IRT is a synchronized transmission method for the cyclic exchange of IRT data between
PROFINET devices. A reserved bandwidth within the send clock is available for the IRT
data. The reserved bandwidth guarantees that the IRT data can be transferred at reserved,
synchronized intervals without being affected by other higher network loads (e.g. TCP/IP
communication or additional real-time communication).
I-slave
The "I-slave" functionality of a CPU allows it to exchange data with a DP master and thus to
be used, for example, as an intelligent preprocessing unit of sub-processes. In its role as a
DP slave, the I-slave is connected to a "higher-level" DP master.
Master
Higher-level, active device on the communication network/PROFIBUS subnet. It has bus
access rights (token), sends data and requests data.
Network
A network consists of one or more linked subnets with any number of devices. Several
networks can exist alongside each other.
Organization block
Organization blocks (OBs) form the interface between the operating system of the CPU and
the user program. The organization blocks determine the order in which the user program is
executed.
Parameter
1. Variable of a STEP 7 code block:
2. Variable for setting the behavior of a module (one or more per module)
In its delivery state, each module has an appropriate basic setting that can be changed by
configuring in STEP 7.
There are static and dynamic parameters
Isochronous mode
Function Manual, 10/2018, A5E43884988-AA
Glossary
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