ABB S800 I/O - AI801;AI810;AI820;AI825 Module Details

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The main power source distribution normally includes a protective ground wire.
This shall be connected to the protected earth (PE) terminal block on a primary
power switch unit. Use cable lug connectors when connecting on the ground screw.
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The cabinet is to be grounded with a copper lead (≥35 mm, 2 AWG) to the plant
ground line. Cabinets in a row shall be individually connected to the plant ground
plane as required.
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Process cable shields are, as applicable, attached directly to the cabinet ground.
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The shields of communication cables are to be connected directly to the modem or
FCI module in an I/O station. This pertains to conventional shielded multi-lead
cable. Please refer to the $GYDQW )LHOGEXV8VHU¶V*XLGH and relevant
PROFIBUS documentation for more information.
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There are three applications of signal grounding directly to chassis. (High frequency
grounding by capacitors is always provided and not discussed in this context).
• Refer to 6,20RGXOHVDQG7HUPLQDWLRQ8Q LWV8VHU¶V*X LGH for the
grounding requirements of each I/O module.
• Signals can be commonly grounded by earthing the reference 0V of centralized
power supply for loads and sensing. Such a power supply system must be
grounded to the same earth line as the system.
• Individual grounding of a signal in the I/O cabinet is possible (if applicable
with respect to I/O module type). The requirement for such an application, is
when the signal is not grounded elsewhere, for example, not locally grounded
at load/sensor or not grounded via a power supply grounding.