SFUSB-8351 card isolated relay switch input and output cards. 8-channel SPDT (C) relay outputs and 8-channel isolated digital input, each channel relay output has LED indicators. Indicator lights in the set state, otherwise it will vanish. Latch output state can be read back. 8-channel optically isolated digital input. Suitable for digital input in noisy environments or with floating potentials. Switch output with clear function on power. Overvoltage protection up to 70V input signal and high-voltage isolation of up to 2500V input channels, to provide security guarantees for the application site;