Application Scenarios
In a legacy automotive assembly plant, a PLC-5 control system continues to orchestrate indicator lamps, solenoid valves, and relay coils across a body shop conveyor line. The existing 1771-OBN module in the main I/O rack has developed a failed output group after years of continuous service, causing a section of the conveyor’s status indication to go dark. Because the plant maintains spare 1771-OBN units on the shelf—knowing this module type is a common failure point in high-density racks—the maintenance team swaps the card during a scheduled line stop. The field wiring arm remains in place, so the technician simply releases the module latch, slides the faulty card out, and seats the replacement. Within minutes, all 32 outputs are restored, and the conveyor’s diagnostic visibility returns before production resumes. The ability to source drop-in replacements for the 1771-OBN directly affects the plant’s ability to avoid extended troubleshooting sessions that would otherwise require tracing individual field circuits.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1771-OBN |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Digital DC Output Module (Sourcing) |
| Number of Outputs | 32 (4 groups of 8) |
| Operating Voltage | 10–30V DC |
| Max Current Per Output | 0.5 A |
| Max Current Per Module | 8 A |
| Backplane Current | 330 mA @ 5V DC |
| Output Type | Sourcing (High-True) |
| Isolation Voltage | 1500V AC RMS (tested for 60 seconds) |
| Max On-State Voltage Drop | 1.5V DC at 0.5A |
| Max Off-State Leakage | 1 mA per output |
| Operating Temperature | 0°C to +60°C |
| Wiring Arm | 1771-WH |
| Fusing | 4.0A, 250V normal-blow fuse per group |
