PLC-5 System

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I/O Modules and Hardware

I/O Adapter Modules I/O Chassis 1771 I/O Module Overview Digital I/O Modules Analog I/O Modules
Specialty I/O Modules Wiring Arms Remote Termination Panels and Cables Distributed I/O
Click to enlarge - 1771WireArmFam_GS

Wiring Arms

Wiring arms provide an easy, flexible interconnection between plant wiring and Allen-Bradley 1771 I/O modules. The integral I/O chassis clamp provides “swing-away” operation for easy module access; an integral module locking tab helps ensure connection integrity. Constructed of an industrial-grade thermoplastic, each wiring arm has one (two for isolated circuits) connection point for each required input or output to the module, plus any needed ancillary connection points for line or signal input power and ground or return. Incoming wires (14 AWG max) may be directly clamped or spade-lugged to the arm. Wiring-arm contacts to the I/O module are either tin or gold plated.

The 1771 Fused Wiring Arm (1771-WHF, -WHFB) provides fuse protection for each output of a module and eases fuse replacement without removing a module from the chassis.

1771 Wiring Arms

Wiring Arm⋆ 
Number of I/O, Max. Number of
Fuse Size max. Weight Typical
1771-WA 8 10 9 Tin
1 Gold
0.1 kg (0.1 lb) General purpose, AC /DC 24…220V
1771-WB 8 12 Gold 0.1 kg (0.1 lb) Analog
1771-WC 8 10 Gold 0.1 kg (0.1 lb) TTL, Low current
1771-WD 8 12 Tin 0.1 kg (0.1 lb) General purpose, 120V AC/DC 6-isolated-I/O modules
1771-WE 8 18 Gold 0.1 kg (0.2 lb) High current "Thermo Wiring Arm"
1771-WF 8 18 Gold 0.1 kg (0.2 lb) Low resistance
1771-WG 16 21 Gold 0.1 kg (0.2 lb) Low resistance
1771-WH 16 21 Tin 0.1 kg (0.2 lb) General purpose
1771-WHF 16 21 Tin 3A 0.1 kg (0.3 lb) General purpose, fused wiring arm, individual circuit protection
1771-WHFB 16 21 Tin 1.5A 0.1 kg (0.3 lb)
1771-WI 8 18 Gold 0.1 kg (0.2 lb) Thermocouple
1771-WN 32 40 Tin 0.1 kg (0.3 lb) 10…32V DC, digital
⋆ Screw torque is 7-9 lb•in for all these wiring arms.