Siemens SIMATIC S7-1500 System Manual page 508

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 can find more information in the "User program" glossary entry.
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 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.
Ground
Conductive ground whose electrical potential can be set equal to zero at any point.
All interconnected, inactive parts of a piece of equipment.
Grounding
Grounding means connecting an electrically conductive part to a grounding electrode by
means of a grounding system.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
Glossary
507