Siemens SIMATIC S7-1500 System Manual page 509

Glossary
GSD file
As a Generic Station Description, this file contains all the properties of a PROFINET or
PROFIBUS device that are necessary for its configuration.
Hardware interrupt
You can find more information in the "Interrupt, hardware" glossary entry.
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 2 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/O module
Device of the distributed I/O that is used as an interface between the controller and the
process.
Identification data
Information that is saved in modules, and that supports the user in reviewing the system
configuration and locating hardware changes.
Instance data block
Each call of a function block in the STEP 7 user program is assigned a data block, which is
automatically generated. Values of the input, output and in/out parameters are stored in the
instance data block, as is the local block data.
Interface module
Module in the distributed I/O system. The interface module connects the distributed I/O
system to the CPUs (IO controllers) via a fieldbus, and prepares the data of the I/O modules.
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S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF