Schneider Electric 890USE17700 manual Logic Power

		The STB NIP 2212 NIM
Logic Power
Introduction	Logic power is a 5 VDC power signal on the island bus that the I/O modules require
	for internal processing. The NIM has a built-in power supply that provides logic
	power. The NIM sends the 5 V logic power signal across the island bus to support
	the modules in the primary segment.
External Source	Input from an external 24 VDC power supply (See Characteristics of the External
Power	Power Supply, p. 39) is needed as the source power for the NIM’s built-in power
	supply. The NIM’s built-in power supply converts the incoming 24 V to 5 V of logic
	power. The external supply must be rated safety extra low voltage (SELV-rated).
		CAUTION
		IMPROPER GALVANIC ISOLATION
		The power components are not galvanically isolated. They are intended
		for use only in systems designed to provide SELV isolation between the
		supply inputs or outputs and the load devices or system power bus. You
		must use SELV-rated supplies to provide 24 VDC source power to the
		NIM.
		Failure to follow this precaution can result in injury or equipment
		damage.

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