Although digital I/O signals are essentially insensitive to external noise due to their low bandwidth and the large voltage swing, as serial data signals for example the application conditions do still in many cases require transmission procedures which are completely resistant to local noise effects.
Glass fiber optic cables used as the transmission medium meet these requirements in ideal fashion and also offer the advantage of galvanic isolation of up to virtually any value between the connected devices. In installations which are subjected to high risk of lightning strikes, for example in outdoor locations or between distant buildings, such a solution ensures that the connected components will survive even under adverse conditions.
The W&T Digital-I/O Extender Set 8x8 is fully implemented in hardware, so that there is no principle risk of malfunction caused by hidden firmware errors or by a system crash.
The functionality of the glass fiber optic connection is cyclically monitored and the status indicated by means of an LED and a switching output. Should the connection fail, the fallback state can be individually set for each digital output.