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Connecting up
5.3 Grounding
PIN
3
4
5
You can find information on wiring in the section "Terminals (Page 22)".
External power supply
Note
Permitted external power supplies
The power supply unit to supply the SCALANCE M804PB must comply with the requirements for
a limited power source according to IEC/EN 60950‑1, section 2.5.
The external power supply for the SCALANCE M804PB must meet the requirements for NEC class
2 circuits as specified in the National Electrical Code ® (ANSI/NFPA 70).
Refer to the section Connecting up (Page 41) and the installation instructions and
instructions for use of the manufacturer of the power supply, the battery or the accumulator.
Note
The requirements of EN61000-4-5, "Surge Immunity Test" on power supply lines with 24 VDC are
met only when a Blitzductor is used:
24 VDC: BVT AVD 24 type no. 918 422
Vendor: DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D - 92306 Neumarkt,
Germany
Note
External power supply for operation in China
The device may only be used with an external power supply that has a CCC approval.
5.3
Grounding
EMC disturbances are diverted to ground via ground. This increases the immunity of the data
transmission.
It is crucial for the correct operation of ground that the connection to the reference potential
surface always has low impedance. Such a connection of the functional ground of the device
does not go first through the cable channel and then to the mounting plate or DIN rail
terminal, but goes directly to the mounting plate or DIN rail terminal.
46
Signal
Description
M2
Ground
L2+
24 VDC
Functional ground, refer to the section "Grounding (Page 46)"
Operating Instructions, 11/2023, C79000-G8976-C496-04
SCALANCE M804PB
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