Siemens SIMATIC S7-1500/ET 200MP System Manual page 374

Equipotential bonding
Electrical connection (potential equalization conductor) that brings the bodies of electrical
equipment and other conductive bodies to the same or almost the same potential, in order to
prevent disruptive or dangerous voltages between these bodies.
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 more information in the glossary entry "User program"
Firmware update
Upgrade of firmware for CPU and the modules (interface modules, I/O modules etc.), e.g.
after function extensions, to the most recent firmware version (update).
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
The 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 immunity.
Ground
Conductive ground whose electrical potential can be set equal to zero at any point.
All interconnected, inactive parts of a piece of equipment that cannot accept any dangerous
contact voltage, even in the event of a fault.
Automation system
System Manual, 01/2023, A5E03461182-AK
Glossary
373