2726188 Phoenix Contact, 2726188 Datasheet - Page 104

• Manufacturer Part Number: 2726188
• Description: INTERBUS Bus Coupler
• Manufacturer: Phoenix Contact

IL SYS INST UM E
Protective earth
grounding (PE)
Functional earth
grounding (FE)
Inline Modular IO
9-8
PHOENIX CONTACT
9.4
Protective earth grounding protects people and machines against hazardous voltages. To
avoid these dangers, correct installation, taking the local conditions into account, is vital.
Functional earth 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
9.4.1
Functional earth 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
immunity.
Functional earth ground is used within the 24 V DC area (SELV).
To ensure reliable functional earth grounding of the station, various points must be
observed.
For Inline Modular IO terminals, functional earth ground is led from the grounded bus
coupler through the 24 V DC area of the station using the FE potential jumper.
1
2
3
Any additional Inline low-level signal 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.
Within an Inline station, a distinction is made between functional earth ground (FE) and
protective earth ground (PE).
For Inline Block IO modules, only functional earth grounding is used.
Functional earth ground (FE) is only used to discharge interference. It does not provide
shock protection for people.
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
connection to the DIN rail. Use grounding terminals to connect the DIN rail to protective
earth ground. The terminals are grounded when they are snapped onto the DIN rail.
Phoenix Contact also recommends grounding the Inline Modular IO bus coupler via the
FE terminal point of the corresponding connector to ensure reliable functional earth
grounding even if the DIN rail is dirty or the metal clip is damaged (see terminal-specific
data sheet).
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).
2
Grounding concept
wire must be used for grounding spring-cage terminals.
Functional earth ground (FE)
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