Allen-Bradley 1771-OBD PLC 5 Digital Output Module
The Allen-Bradley 1771-OBD, also cataloged as the 1771-OBD Digital Output Module, operates as a dedicated hardware component for discrete DC switching within Allen-Bradley PLC 5 I/O chassis networks. It interfaces internal controller logic states with field-side actuators, switching up to 16 independent DC loads across a 10 to 60 VDC operating range.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OBD |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 1.54 lbs (0.70 kg) |
| Dimensions | Standard 1771 Single-Slot I/O Module |
| Operating Temp | 0 to +60 deg C (+32 to +140 deg F) |
| Power Consumption | 400 mA @ 5 VDC backplane current |
| Digital Outputs | 16 discrete channels |
| Output Voltage Range | 10 to 60 VDC |
| Current Rating | 2 A per output (resistive) |
| Module Current Limit | 8 A total per module |
| Pilot Duty Rating | 0.2 A per output |
Backplane Bus Communication Velocity and Deterministic Networks
Designed for direct integration into 1771 universal I/O chassis, the card communicates across the local backplane bus to execute high-speed control logic commands from PLC 5 processors. Channel switching states are processed deterministically to maintain timing synchronization across connected field devices. Optimizing backplane bus communication velocity and preserving firmware flash compatibility ensures rapid output updates while isolating backplane logic from field-side voltage transients.
Frequently Asked Questions
Q: What are the current loading limits for individual channels and the overall 1771-OBD module?
A: Each individual output channel supports up to 2 A resistive load (0.2 A pilot duty), while the maximum total current across all 16 channels must not exceed 8 A per module.
Q: How much power does the module draw from the 1771 chassis backplane?
A: The module draws 400 mA at 5 VDC from the local backplane power supply to operate its internal logic interface.
Field Installation Guidelines
- Turn off chassis backplane power and field power supplies before inserting or removing the 1771-OBD module.
- Verify chassis keying bands match the slot positioning required for 1771 DC output cards.
- Slide the module into the card guide slot until the backplane connector seats completely, then secure the top and bottom latch arms.
- Wire external 10 to 60 VDC power and field loads to the 1771 wiring arm, ensuring total module current does not exceed 8 A.
- Route field DC output wiring away from low-level analog or communication cables to minimize electromagnetic interference.
Allen-Bradley 1771-OBD PLC 5 Digital Output Module
Allen-Bradley 1771-OBD PLC 5 Digital Output Module
The Allen-Bradley 1771-OBD, also cataloged as the 1771-OBD Digital Output Module, operates as a dedicated hardware component for discrete DC switching within Allen-Bradley PLC 5 I/O chassis networks. It interfaces internal controller logic states with field-side actuators, switching up to 16 independent DC loads across a 10 to 60 VDC operating range.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OBD |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 1.54 lbs (0.70 kg) |
| Dimensions | Standard 1771 Single-Slot I/O Module |
| Operating Temp | 0 to +60 deg C (+32 to +140 deg F) |
| Power Consumption | 400 mA @ 5 VDC backplane current |
| Digital Outputs | 16 discrete channels |
| Output Voltage Range | 10 to 60 VDC |
| Current Rating | 2 A per output (resistive) |
| Module Current Limit | 8 A total per module |
| Pilot Duty Rating | 0.2 A per output |
Backplane Bus Communication Velocity and Deterministic Networks
Designed for direct integration into 1771 universal I/O chassis, the card communicates across the local backplane bus to execute high-speed control logic commands from PLC 5 processors. Channel switching states are processed deterministically to maintain timing synchronization across connected field devices. Optimizing backplane bus communication velocity and preserving firmware flash compatibility ensures rapid output updates while isolating backplane logic from field-side voltage transients.
Frequently Asked Questions
Q: What are the current loading limits for individual channels and the overall 1771-OBD module?
A: Each individual output channel supports up to 2 A resistive load (0.2 A pilot duty), while the maximum total current across all 16 channels must not exceed 8 A per module.
Q: How much power does the module draw from the 1771 chassis backplane?
A: The module draws 400 mA at 5 VDC from the local backplane power supply to operate its internal logic interface.
Field Installation Guidelines
- Turn off chassis backplane power and field power supplies before inserting or removing the 1771-OBD module.
- Verify chassis keying bands match the slot positioning required for 1771 DC output cards.
- Slide the module into the card guide slot until the backplane connector seats completely, then secure the top and bottom latch arms.
- Wire external 10 to 60 VDC power and field loads to the 1771 wiring arm, ensuring total module current does not exceed 8 A.
- Route field DC output wiring away from low-level analog or communication cables to minimize electromagnetic interference.
