The Allen-Bradley 1771-WG, also cataloged as the 1771-WG Field Wiring Swing Arm, operates as a dedicated hardware component for field sensor signal termination and module interface wiring within Allen-Bradley 1771 Universal I/O chassis platforms.
Hardware Specifications
Parameter
Specification
Model
1771-WG
Brand
Allen-Bradley
Origin
USA
Weight
0.22 lbs (0.10 kg)
Dimensions
Standard 1771 I/O Arm Form Factor
Operating Temp
0 to 60 deg C (32 to 140 deg F)
Power Consumption
Passive Component (0 W)
Terminal Count
21 Screw Terminals
Terminal Contact Plating
Gold-Plated Contacts
Application
16-Point Digital / Analog I/O Modules
Wire Size Compatibility
14 to 22 AWG
Mounting
1771 Universal I/O Chassis Slot Latch
Deterministic Backplane Bus & I/O Isolation Execution
The 1771-WG attaches directly to the front locking pivot of 1771 Universal I/O chassis slots, enabling rapid module replacement without disconnecting field wiring. Featuring 21 gold-plated screw terminals, the unit ensures low-contact resistance and corrosion immunity across low-voltage digital and high-density analog signal paths. This passive termination structure maintains channel-to-channel isolation and signal integrity between field devices and the 1771 backplane bus structure.
Frequently Asked Questions
Q: Does the 1771-WG field wiring arm draw power from the 1771 backplane?
A: No, the 1771-WG is a passive mechanical swing arm containing no active electronics, drawing 0 mA from the backplane power supply.
Q: What benefit do gold-plated terminals provide on the 1771-WG swing arm?
A: Gold-plated contacts prevent oxidation and electrical degradation over time, making the arm suitable for low-current, low-voltage digital and analog field signals.
Field Installation Guidelines
Chassis Engagement: Hook the lower hinge pins of the 1771-WG onto the 1771 I/O chassis swing arm pivot bar, aligning the unit directly with the designated module slot.
Terminal Wiring: Strip field conductors (14 to 22 AWG) to 3/8 inch (10 mm) and secure them under the screw terminals using standard screwdrivers. Observe torque ratings to prevent terminal block damage.
Module Insertion: Swing the wired arm upward against the front face of the installed 1771 I/O module until the locking latch snaps securely into place, establishing full electrical contact.
Shield Wire Termination: Route signal cable shield drain wires to designated chassis ground terminals to mitigate field electromagnetic interference (EMI).
Strain Relief: Secure the incoming wire bundle to the lower cable tie tie-down bar on the arm to prevent mechanical tension on individual screw terminals.
