Allen-Bradley 1771-WC Wiring Arm
The Allen-Bradley 1771-WC, also cataloged as the 1771-WC Wiring Arm, operates as a dedicated hardware component for field signal termination and cable interface within Allen-Bradley PLC-5 systems. It provides direct physical connection between plant field wiring and 1771 TTL low-current I/O modules, enabling rapid module swapping without disturbing field conductors.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-WC |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.25 lbs (0.11 kg) |
| Dimensions | 4.5 x 12.4 x 6.3 in (114 x 315 x 160 mm) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Passive (No external power required) |
| Module Type | Conformal Coated Wiring Arm |
| Max Number of I/O | 8 I/O points |
| Number of Terminals | 10 Terminals |
| Contact Plating | Gold-plated terminals |
| Screw Torque | 7 to 9 lb-in (0.8 to 1.0 Nm) |
| Terminal Wire Size | Up to AWG 14 (spade lugged or clamped) |
Backplane Bus Communication Velocity & I/O Density Scaling
The 1771-WC wiring arm maintains signal integrity across high-density I/O arrays without introducing resistance or signal propagation delays to the module backplane. Gold-plated contact points prevent terminal oxidation on low-voltage, low-current TTL switching circuits, preserving digital edge detection and timing consistency. Designed for maximum physical durability, its conformally coated thermoplastic body insulates 10 independent terminal connections against corrosive airborne contaminants and harsh industrial environment degradation.
Frequently Asked Questions
Q: Does the 1771-WC wiring arm require separate DC power to drive its internal connections?
A: No, the 1771-WC is a completely passive mechanical and electrical interface unit requiring no external power input.
Q: What screw torque specification should be applied to prevent damage to field terminal connections?
A: Terminal screws on the 1771-WC must be tightened to a torque rating between 7 and 9 lb-in (0.8 to 1.0 Nm).
Field Installation Guidelines
- Wiring Termination: Connect field wiring up to AWG 14 using spade lugs or direct wire clamping onto the 10 gold-plated terminal screws. Torque screws to 7-9 lb-in.
- Arm Installation: Swing the 1771-WC wiring arm onto the bottom pivot pin of the assigned 1771 I/O slot and push firmly until it latches securely onto the front of the I/O module.
- Module Replacement: To replace an I/O module, unlatch and pivot the 1771-WC arm forward without disconnecting any field wiring, keeping field circuits intact while exchanging hardware.
Allen-Bradley 1771-WC Wiring Arm
Allen-Bradley 1771-WC Wiring Arm
The Allen-Bradley 1771-WC, also cataloged as the 1771-WC Wiring Arm, operates as a dedicated hardware component for field signal termination and cable interface within Allen-Bradley PLC-5 systems. It provides direct physical connection between plant field wiring and 1771 TTL low-current I/O modules, enabling rapid module swapping without disturbing field conductors.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-WC |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.25 lbs (0.11 kg) |
| Dimensions | 4.5 x 12.4 x 6.3 in (114 x 315 x 160 mm) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Passive (No external power required) |
| Module Type | Conformal Coated Wiring Arm |
| Max Number of I/O | 8 I/O points |
| Number of Terminals | 10 Terminals |
| Contact Plating | Gold-plated terminals |
| Screw Torque | 7 to 9 lb-in (0.8 to 1.0 Nm) |
| Terminal Wire Size | Up to AWG 14 (spade lugged or clamped) |
Backplane Bus Communication Velocity & I/O Density Scaling
The 1771-WC wiring arm maintains signal integrity across high-density I/O arrays without introducing resistance or signal propagation delays to the module backplane. Gold-plated contact points prevent terminal oxidation on low-voltage, low-current TTL switching circuits, preserving digital edge detection and timing consistency. Designed for maximum physical durability, its conformally coated thermoplastic body insulates 10 independent terminal connections against corrosive airborne contaminants and harsh industrial environment degradation.
Frequently Asked Questions
Q: Does the 1771-WC wiring arm require separate DC power to drive its internal connections?
A: No, the 1771-WC is a completely passive mechanical and electrical interface unit requiring no external power input.
Q: What screw torque specification should be applied to prevent damage to field terminal connections?
A: Terminal screws on the 1771-WC must be tightened to a torque rating between 7 and 9 lb-in (0.8 to 1.0 Nm).
Field Installation Guidelines
- Wiring Termination: Connect field wiring up to AWG 14 using spade lugs or direct wire clamping onto the 10 gold-plated terminal screws. Torque screws to 7-9 lb-in.
- Arm Installation: Swing the 1771-WC wiring arm onto the bottom pivot pin of the assigned 1771 I/O slot and push firmly until it latches securely onto the front of the I/O module.
- Module Replacement: To replace an I/O module, unlatch and pivot the 1771-WC arm forward without disconnecting any field wiring, keeping field circuits intact while exchanging hardware.
