Siemens SIMATIC ET 200pro Operating Instructions Manual page 146

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
Chassis ground refers to all interconnected inactive parts of equipment that are unable to
carry hazardous voltage even in the event of a fault.
GSD file
The Generic Station Description file contains all properties of a PROFINET or PROFIBUS
device that are necessary for its configuration.
Hardware interrupt
See "Interrupt, hardware"
I/O modules
See Electronic modules
Identification data
Information that is saved in modules, and that supports the user in reviewing the system
configuration and locating hardware changes.
I-device
The "I-device" functionality (intelligent IO device) of a CPU allows data to be exchanged with
an IO controller and subsequent use of the CPU, for example, as an intelligent
preprocessing unit of subprocesses. In its role as an IO device, the I-device is connected to
a "higher-level" IO controller.
The user program in the CPU with I-device functionality ensures the preprocessing. The
process values acquired centrally or decentrally (PROFINET IO or PROFIBUS DP) are
preprocessed by the user program and made available to the CPU of a higher-level station
via a PROFINET IO device interface.
Instance data block
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, as well as local
block data, are stored in the instance data block.
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC
Glossary
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