Allen-Bradley 1771-OC PLC-5 Digital DC Output Module
The Allen-Bradley 1771-OC is an 8-channel digital DC output driver module designed for the PLC-5 platform architecture. Operating within a 42 to 50 VDC voltage range, it drives DC solenoids, relays, indicators, and motor starters in legacy control chassis.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OC |
| Brand | Allen-Bradley |
| Product Family | PLC-5 |
| Product Type | Output Module |
| Number of Outputs | 8 channels |
| Output Voltage Range | 42 to 50 VDC |
| Continuous Output Current | 1.5 A per output (8.0 A total per module) |
| Surge Current | 4.0 A for 1 ms (repeatable every 1 s) |
| On-State Voltage Drop | 2.0 VDC max |
| Off-State Leakage Current | 5.0 mA max per output |
| Backplane Current | 165 mA @ 5 VDC (±5%) |
| Maximum Power Dissipation | 16.9 W |
| Isolation Voltage | Opto-electrical isolation tested to 1000 VAC for 60 s |
| Wiring Arm | 1771-WA |
| Wire Size | 14 to 22 AWG (2.5 to 0.25 mm2) stranded copper |
| Operating Temperature | 0 to 60 deg C |
| Weight | 0.56 kg |
Channel Load Handling and Power Distribution
The module delivers up to 1.5 A per channel continuous output current, capped at a maximum of 8.0 A aggregate load across all eight channels. Power logic components draw 165 mA directly from the 5 VDC chassis backplane supply. Integrated surge capability allows outputs to handle inrush currents up to 4.0 A for 1 millisecond intervals.
Interfacing and Installation Requirements
Field wiring connects to the 1771-WA field wiring arm, enabling slot insertion and removal without disconnecting external field leads. The module supports direct connection to DC input modules (such as the 1771-IC) when sharing a common DC power source to maintain matching ground potentials across control loops.
Frequently Asked Questions
Q: What size wire is recommended for the 1771-WA wiring arm? A: Use 14 to 22 AWG stranded copper wire rated at 75 deg C or higher, adhering to a 7 to 9 lb-in terminal screw torque limit.
Q: Can an output on the 1771-OC directly drive a 48 VDC input module? A: Yes, it can directly drive a 1771-IC 48 VDC input module, provided both modules share the exact same DC power supply to prevent ground potential differences.
Allen-Bradley 1771-OC PLC-5 Digital DC Output Module
Allen-Bradley 1771-OC PLC-5 Digital DC Output Module
The Allen-Bradley 1771-OC is an 8-channel digital DC output driver module designed for the PLC-5 platform architecture. Operating within a 42 to 50 VDC voltage range, it drives DC solenoids, relays, indicators, and motor starters in legacy control chassis.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OC |
| Brand | Allen-Bradley |
| Product Family | PLC-5 |
| Product Type | Output Module |
| Number of Outputs | 8 channels |
| Output Voltage Range | 42 to 50 VDC |
| Continuous Output Current | 1.5 A per output (8.0 A total per module) |
| Surge Current | 4.0 A for 1 ms (repeatable every 1 s) |
| On-State Voltage Drop | 2.0 VDC max |
| Off-State Leakage Current | 5.0 mA max per output |
| Backplane Current | 165 mA @ 5 VDC (±5%) |
| Maximum Power Dissipation | 16.9 W |
| Isolation Voltage | Opto-electrical isolation tested to 1000 VAC for 60 s |
| Wiring Arm | 1771-WA |
| Wire Size | 14 to 22 AWG (2.5 to 0.25 mm2) stranded copper |
| Operating Temperature | 0 to 60 deg C |
| Weight | 0.56 kg |
Channel Load Handling and Power Distribution
The module delivers up to 1.5 A per channel continuous output current, capped at a maximum of 8.0 A aggregate load across all eight channels. Power logic components draw 165 mA directly from the 5 VDC chassis backplane supply. Integrated surge capability allows outputs to handle inrush currents up to 4.0 A for 1 millisecond intervals.
Interfacing and Installation Requirements
Field wiring connects to the 1771-WA field wiring arm, enabling slot insertion and removal without disconnecting external field leads. The module supports direct connection to DC input modules (such as the 1771-IC) when sharing a common DC power source to maintain matching ground potentials across control loops.
Frequently Asked Questions
Q: What size wire is recommended for the 1771-WA wiring arm? A: Use 14 to 22 AWG stranded copper wire rated at 75 deg C or higher, adhering to a 7 to 9 lb-in terminal screw torque limit.
Q: Can an output on the 1771-OC directly drive a 48 VDC input module? A: Yes, it can directly drive a 1771-IC 48 VDC input module, provided both modules share the exact same DC power supply to prevent ground potential differences.
