Siemens SIMATIC ET 200SP HA System Manual page 136

Glossary
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.
Ex BaseUnit
The Ex BaseUnit is a component of the Ex module group:
Types
• Ex BaseUnit for the Ex power module
• Ex BaseUnit for Ex I/O modules
Tasks:
• Mounting of modules
• Connecting the system bus with the I/O modules
• Routing voltages and signals
Firmware update
Upgrade of firmware for modules (interface modules, I/O modules etc.), e.g. after function
extensions, to the newest firmware version (update).
Functional grounding
Functional grounding is a low-impedance current path between electric circuits and ground. It
is not designed as a safety measure but instead, for example, as a measure to improve
interference immunity.
Ground
Conductive ground, the electrical potential of which can be taken to be 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.
Ground
Conductive ground, the electrical potential of which can be taken to be 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.
Grounding
Grounding means connecting an electrically conductive part to a grounding electrode by means
of a grounding system.
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Modules for devices in a hazardous area
System Manual, 04/2021, A5E50165138-AA