The digital input interfaces via relay are used to isolate the field sensors from the card and/or to adapt the operation of the said elements to the voltage required by the DCS. The interfaces also support additional characteristics that provide many benefits such as:
Redundancy: the interfaces have 2 50-pole (AKB) connectors for redundancy purposes.
Many of the interfaces activate a relay to indicate if one of the two possible power sources has dropped below a value of approximately 12 V.
The cards can be mounted via tension clamp or screw connection.
The input sensors can be connected in two ways: supplied with power directly from the card or directly from the field.