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The GE-Emerson IC660BBS102 Genius Isolated I/O Block reports a Failed Switch diagnostic if any output's commanded state is not the same as the actual state of the block's own internal switch.
Isolation is rated to withstand 250 VAC/VDC continuous between any group and ground or between any two groups. Transient rating is 2000V peak for 10 sec.
Control power for the block is tapped off the input/output device voltages wired to the terminals. The block has terminals for a separate power source for the internal electronics. The block power supply can be independently either AC or DC. The block need not be powered in the same manner as the circuits.
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