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H-Sync forwarding is not relevant for redundant H 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.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.
Interrupt
The operating system of the CPU distinguishes between various priority classes that control
the execution of the user program. These priority classes include interrupts such as
hardware interrupts. When an interrupt occurs, the operating system automatically calls an
assigned organization block. You program the required reaction in the organization block (for
example in an FB).
Interrupt, cyclic
The CPU generates a cyclic interrupt periodically within a parameterizable time grid and then
processes the corresponding organization block.
Interrupt, diagnosticsDiagnostics-capable modules signal detected system errors to the CPU using diagnostics
interrupts.
Interrupt, hardware
A hardware interrupt is triggered by interrupt-triggering modules following a certain event in
the process. The hardware interrupt is signaled to the CPU. The CPU then processes the
assigned organization block according to the priority of this interrupt.
Interrupt, time-delay
The time-delay interrupt is one of the program execution priority classes of SIMATIC S7. The
time-delay interrupt is generated upon expiration of a timer started in the user program. The
CPU then processes the corresponding organization block.
Interrupt, time-of-day
The time-of-day interrupt is one of the program execution priority classes of SIMATIC S7.
The time-of-day interrupt is generated based on a specific date and time. The CPU then
processes the corresponding organization block.
Glossary
R/H redundant system
316 System Manual, 10/2018, A5E41814787-AA
address
The address is made up of four dThe address is made up of four decimal numbers with a range of values from 0 through
255. The decimal numbers are separated by a do

The address consists of the following:
● Address of the network
● Device address (PROFINET interface of the IO controllers/IO devices)
Isolated modules
In the case of isolated input/output modules, the reference potentials of the control and load
circuits are electrically isolated. Examples are optical isolators, relays or transformers.
Input/output circuits can be connected to common potential.
Load current supply
The load current supply supplies the electric input and output circuits of the module.
MAC address
Each port of a PROFINET interface (PROFINET device) is assigned a unique global device
identifier in the factory. This 6-byte long device identifier is the MAC address.
The MAC address is divided into:
● 3-byte manufacturer ID