Allen-Bradley 1771-WI Thermocouple Wiring Arm
Configured for high-density signal termination in Allen-Bradley 1771 I/O chassis, the Allen-Bradley 1771-WI (1771-WI Wiring Arm) provides direct physical/electrical execution. It establishes electrical connections between field thermocouple wiring and 1771-IXE thermocouple input modules across 18 dedicated screw terminal points without disturbing backplane wiring during module replacement.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-WI |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.26 lbs (0.12 kg) |
| Dimensions | Standard 1771 I/O Wiring Arm Form Factor |
| Operating Temp | Standard Industrial Operating Range |
| Power Consumption | Passive Component / Zero Idle Draw |
| Terminal Count | 18 Screw Terminals |
| Compatible Module | Allen-Bradley 1771-IXE Thermocouple Input Module |
| Wire Compatibility | Thermocouple extension wire / copper signal wire |
| Mounting Type | Direct I/O Chassis Pivot Assembly Snap-In |
Backplane Bus Integrity and I/O Density Scaling
The wiring arm maintains permanent panel wiring connections when inserting or removing adjacent thermocouple cards, scaling I/O density without disturbing internal backplane bus communication velocity. Cold junction compensation (CJC) sensors embedded within the assembly preserve signal accuracy across all 18 terminal channels, preventing millivolt signal drift and shielding low-level sensor inputs from high-frequency electromagnetic interference within control enclosures.
Frequently Asked Questions
Q: Does the 1771-WI allow replacing a 1771-IXE module while field power is applied?
A: Yes, the wiring arm swings outward on its pivot pins to disengage from the front edge connector of the 1771-IXE module, enabling hot-swapping or card replacement without disconnecting individual field wires.
Q: What type of wiring connections are supported on the 1771-WI arm?
A: The arm features 18 heavy-duty screw terminals designed to clamp spade lugs or stripped solid/stranded thermocouple extension wires directly.
Field Installation Guidelines
- Align the upper and lower pivot pins of the 1771-WI wiring arm with the mounting slots on the 1771 I/O chassis base.
- Strip field thermocouple wire ends carefully to avoid nicking conductors, or terminate with insulated fork connectors.
- Wire field thermocouple pairs to designated terminal pairs on the 1771-WI, maintaining correct positive and negative polarity alignment per thermocouple type.
- Tighten terminal screws firmly to ensure low-resistance contacts and minimize unwanted thermal EMF at junction points.
- Swing the wiring arm inward until the latch mechanism locks securely against the 1771-IXE module front housing.
Allen-Bradley 1771-WI Thermocouple Wiring Arm
Allen-Bradley 1771-WI Thermocouple Wiring Arm
Configured for high-density signal termination in Allen-Bradley 1771 I/O chassis, the Allen-Bradley 1771-WI (1771-WI Wiring Arm) provides direct physical/electrical execution. It establishes electrical connections between field thermocouple wiring and 1771-IXE thermocouple input modules across 18 dedicated screw terminal points without disturbing backplane wiring during module replacement.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-WI |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.26 lbs (0.12 kg) |
| Dimensions | Standard 1771 I/O Wiring Arm Form Factor |
| Operating Temp | Standard Industrial Operating Range |
| Power Consumption | Passive Component / Zero Idle Draw |
| Terminal Count | 18 Screw Terminals |
| Compatible Module | Allen-Bradley 1771-IXE Thermocouple Input Module |
| Wire Compatibility | Thermocouple extension wire / copper signal wire |
| Mounting Type | Direct I/O Chassis Pivot Assembly Snap-In |
Backplane Bus Integrity and I/O Density Scaling
The wiring arm maintains permanent panel wiring connections when inserting or removing adjacent thermocouple cards, scaling I/O density without disturbing internal backplane bus communication velocity. Cold junction compensation (CJC) sensors embedded within the assembly preserve signal accuracy across all 18 terminal channels, preventing millivolt signal drift and shielding low-level sensor inputs from high-frequency electromagnetic interference within control enclosures.
Frequently Asked Questions
Q: Does the 1771-WI allow replacing a 1771-IXE module while field power is applied?
A: Yes, the wiring arm swings outward on its pivot pins to disengage from the front edge connector of the 1771-IXE module, enabling hot-swapping or card replacement without disconnecting individual field wires.
Q: What type of wiring connections are supported on the 1771-WI arm?
A: The arm features 18 heavy-duty screw terminals designed to clamp spade lugs or stripped solid/stranded thermocouple extension wires directly.
Field Installation Guidelines
- Align the upper and lower pivot pins of the 1771-WI wiring arm with the mounting slots on the 1771 I/O chassis base.
- Strip field thermocouple wire ends carefully to avoid nicking conductors, or terminate with insulated fork connectors.
- Wire field thermocouple pairs to designated terminal pairs on the 1771-WI, maintaining correct positive and negative polarity alignment per thermocouple type.
- Tighten terminal screws firmly to ensure low-resistance contacts and minimize unwanted thermal EMF at junction points.
- Swing the wiring arm inward until the latch mechanism locks securely against the 1771-IXE module front housing.
