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In its delivery state, an IO device has no device name. A device name must be assigned
using the PG/PC before an IO device can be addressed by an IO controller. Example: For
the transmission of configuration data (including the address) during startup or for the
exchange of user data in cyclic mode.Monitoring functions include:
● Detection, localization and classification of errors, faults and alarms.
● Display and further evaluation of errors, faults and alarms.
They run automatically while the system is in operation. This increases the availability of
systems by reducing commissioning times and downtimes.
Diagnostics buffer
The diagnostics buffer is a battery-backed memory area in the CPU where diagnostics
events are stored in their order of occurrence.
Diagnostics interrupt
You will find further information in the glossary entry "Interrupt, diagnostics".Distributed I/O
Equotential bonding
Electrical connection (equotential bonding conductor) that brings the conductive parts of
electrical equment and other conductive parts to the same or approximately the same
potential. This prevents disruptive or dangerous voltages arising between these parts.
Firmware of the CPU
In SIMATIC, a distinction is made between the firmware of the CPU and user programs.
The firmware is a software embedded in electronic devices. The firmware is permanently
connected to the hardware in functional terms. It is usually saved in a flash memory, such as
EPROM, EEPROM or ROM, and cannot be replaced by the user or only with special tools or
functions.
User program: You will find further information in the glossary entry "User program".
Firmware update
You update the module firmware with a firmware update. A firmware update is, for example,
run for new functions of a CPU or an interface module.
Function
A function (FC) is a code block with no static data. A function allows you to pass parameters
in the user program. Functions are thus suited for programming frequently recurring complex
functions, such as calculations.
Function block
A function block (FB) is a code block with static data. An FB allows you to pass parameters
in the user program. Function blocks are thus suited for programming frequently recurring
complex functions, such as closed-loop controls or operating mode selection.

Functional ground
Functional ground is a low-impedance current path between electric circuits and ground. It is
not intended as a protective measure but rather, for example, for improvement of
interference immunityConductive ground whose electrical potential can be set equal to zero at any point.
All interconnected, inactive parts of a piece of equment.
Ground
Conductive ground whose electrical potential can be set equal to zero at any point.
All interconnected, inactive parts of a piece of equment.
Grounding
Grounding means connecting an electrically conductive part to a grounding electrode by
means of a grounding system.
GSD file
As a Generic Station Descrtion, this file contains all the properties of a PROFINET or
PROFIBUS device that are necessary for its configuration.
Hardware interrupt
You will find further information in the glossary entry "Interrupt, hardware".
H-Sync forwarding
H-Sync forwarding enables a PROFINET device with MRP to forward synchronization data
(synchronization frames) within the PROFINET ring only.