Siemens SIMATIC ET 200AL System Manual page 1883

Glossary
H-Sync Forwarding
H-Sync Forwarding enables a PROFINET device with MRP to forward synchronization data
(synchronization frames) of a S7-1500R redundant system only within the PROFINET ring.
In addition, H-Sync Forwarding forwards the synchronization data even during
reconfiguration of the PROFINET ring. H-Sync Forwarding avoids a cycle time increase if the
PROFINET ring is interrupted.
S7-1500R: H-Sync Forwarding is recommended for all PROFINET devices with only two ports
in the PROFINET ring. All PROFINET devices with more than two ports (e.g. switch) in the
PROFINET ring must support H-Sync forwarding.
S7-1500H: H-Sync Forwarding is not relevant for redundant S7-1500H systems.
I-device
The "I-device" (intelligent IO device) functionality of a CPU facilitates data exchange with an
IO controller, for example, as intelligent preprocessing unit of sub-processes. In its role as an
IO device, the I-device is accordingly integrated into a "higher-level" IO controller.
Industrial Ethernet
Industrial Ethernet is a guideline for installing an Ethernet in an industrial environment. The
biggest difference from standard Ethernet is the mechanical current carrying capacity and
noise immunity of the individual components.
Interrupt
An interrupt is an event that causes the operating system of an S7-CPU to automatically call
an assigned organization block (interrupt OB) in which the user can program the desired
reaction.
Interrupt, diagnostics
→ Diagnostics error interrupt
IP address
To allow a PROFINET device to be addressed as a device on Industrial Ethernet, this device
also requires an IP address that is unique within the network. Example: An IPv4 address
consists of 4 decimal numbers with the value range 0 to 255. The decimal numbers are
separated by periods.
The IP address is made up of the following components:
• Address of the network
• Address of the device (generally called the host or network node).
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PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL