The Digital Output Driver X1-NIS-DO-02 module is suitable for energizing safety related circuits, up to SIL 3 level, for high risk industries. It can drive solenoid valves, visual or audible alarms to alert a plant operator, or other process control devices from driving signals imposed by the system card. They can also be used as switchable supplies to power measuring or process control equipments. Up to five units can be paralleled together to drive high-current loads. On the system side, a wide compatibility towards different DCS/PLC is guaranteed: driving pulse testing is permitted by a dedicated internal circuit, which prevents spurious activations and LED flickering, while offering an acceptable resistance to the DO Card. Line and load short/open circuit detection are provided, both when the load is off and when the load is on. The fault in the field is directly mirrored to the PLC DO by artificially increasing the input impedance without changing the output state, and it is also reported to the cumulative fault. To ease maintenance operations, field devices can be disconnected through a two-position insertion/extraction mechanism. This product requires a dedicated Termination Board.
FEATURES
- SIL 3 / SC 3
- Installation in Zone 2 / Division 2
- Loop disconnection to ease maintenance operations
- Short-circuit proof
- Compatible with DCS/PLC pulse testing
- Selectable input impedance (software programmable)
- Up to 500 mA (with 5 units in parallel)
- Line & Load short/open circuit detection (programmable thresholds)
- Field fault mirroring to the DCS/PLC DO Card
- Three port isolation, Input/Output/Supply
