Allen-Bradley 1797-OB4D Digital Output Module

FAQ

Q1. What is the main function of 1797-OB4D?
It is a hazardous-area digital output module used to switch field devices like solenoids, indicators, and relays in FLEX Ex systems.

Q2. How many outputs does it have?
It provides 4 digital output channels.

Q3. What type of output is it?
It is a 24 VDC sourcing output module (non-isolated group reference design).

Q4. Is it suitable for hazardous environments?
Yes, it is designed for intrinsically safe FLEX Ex applications such as oil & gas and chemical plants.

Q5. Does it have diagnostics?
Yes, it supports short-circuit detection and open-load diagnostics per channel, reported to the controller.

Q6. What is its update speed?
Output status is refreshed approximately every 2 ms via backplane communication.

Q7. What devices can it control?
It can drive low-power DC field devices such as solenoids, pilot lamps, and interface relays.

Q8. What is its main limitation compared to standard FLEX I/O?
It is designed for intrinsic safety applications, so it has lower power output and stricter wiring requirements than standard industrial modules.

1797-OB4D Allen Bradley

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