Phoenix Contact IB IL AO 4/U/0-10-ECO Handleiding (190 Pagina's)

Handleiding

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Appendix: Explanation of abbreviations and symbols

6452_en_11 Phoenix Contact 177 / 188

C Appendix: Explanation of abbreviations and symbols

C 1 Explanation of abbreviations

Ground Ground, general symbol

FE Functional ground

Noiseless ground

This ground is free from external noise voltage, and is used to ground cable shields and

to suppress noise and interference voltages.

Functional ground is a low-impedance current path between circuits and ground. It is not

designed as a safety measure but rather, for example, for the improvement of noise im-

munity (EN 61131/IEC 61131).

This ground connection must be separated from parts with hazardous voltage by means

of double or reinforced insulation (EN 60950).

PE Protective ground

This ground is used to ground devices. It also provides shock protection for people.

Protective ground is a low-impedance current path that minimizes the risk to the user in

the event of an error (EN 61131/IEC 61131).

GND 0 V ground; housing or chassis

In this user manual the term ground refers to common voltage return lines. Ground is

electrically isolated from FE and PE. If a jumper is placed between ground and FE or PE,

this isolation is removed.

Various additions to GND (such as F-GND, BC-GND, etc.) indicate separate potentials.

U

BK

Bus coupler supply

The voltage U

BK

is used to supply the bus coupler power supply unit. In the power supply

unit, the communications power U

L

and the analog voltage U

ANA

are generated from the

voltage U

BK

.

U

M

Main supply (I/O supply in the main circuit)

The voltage U

M

supplies all of the devices connected to the main circuit.

The voltage U

M

is supplied using a bus coupler or a power terminal and is led through the

potential jumper to the next power terminal. (Exception: terminal with a relay output in-

terrupts the potential jumper)

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