1797-OB4D Allen‑Bradley FLEX Ex 4-channel Non-isolated Sourcing Digital Output Module

1797-OB4D belongs to Rockwell Allen‑Bradley FLEX Ex series intrinsically safe remote digital output module, matched with 1797-TB3 terminal base, used in hazardous explosion-proof areas, connected via Flexbus to FLEX Ex adapter for field actuator control, widely used in petrochemical, chemical process legacy automation spare replacement.