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

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11.3 Grounding concept

Within an Inline station, a distinction is made between functional ground (FE) and

protective ground (PE).

For Inline Block IO modules, only functional grounding is used.

Protective grounding (PE) Protective grounding protects people and machines against hazardous voltages. To avoid

these dangers, correct installation, taking the local conditions into account, is vital.

Functional grounding (FE) Functional grounding is used to improve noise immunity. All devices must be grounded

so that any possible interference from data transmission paths is shielded and

discharged to ground.

A 1.5 mm

2

wire must be used for grounding spring-cage terminals.

11.3.1 Functional ground (FE)

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.

Functional ground (FE) is only used to discharge interference. It does not provide

shock protection for people.

Functional ground is used within the 24 V DC area (SELV).

To ensure reliable functional grounding of the station, various points must be observed.

Inline For Inline terminals, functional ground is led from the grounded bus coupler through the

24 V DC area of the station using the FE potential jumper.

1 The bus coupler, power terminals, and segment terminals have an FE spring (metal

clip) on the bottom of the electronics base. This spring establishes an electrical con-

nection to the DIN rail. Use grounding terminals to connect the DIN rail to protective

ground. The terminals are grounded when they are snapped onto the DIN rail.

2 Phoenix Contact also recommends grounding the Inline bus coupler via the FE termi-

nal point of the corresponding connector to ensure reliable functional grounding even

if the DIN rail is dirty or the metal clip is damaged (see terminal-specific data sheet).

3 A 120 V AC or 230 V AC voltage area interrupts the FE potential jumper. Therefore, a

24 V DC power terminal, which is installed directly after such an area, must also be

grounded via the FE terminal point (see terminal-specific data sheet).

Any additional Inline extra-low voltage terminals are automatically grounded via the

FE potential jumper when they are properly installed.

The FE potential jumper is looped through the power-level terminals.

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