Discontinued product.
This product has been replaced by the M221EA.
The M221E provides supervision of two input circuits from external devices and an unmonitored single pole volt-free changeover contact for external devices. The module features a built-in short-circuit isolator. Input channels are capable of both latched and analogue supervision: there are three separate latched states; Normal, Open-Circuit and Combined Alarm/Short. The analogue supervision continuously monitors the supervised circuit, returning a signal proportional to the circuit resistance.
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