Product Description
Allen-Bradley 1771-A3B I/O Chassis
The Allen-Bradley 1771-A3B is a 12-slot I/O chassis designed to house 1771 series I/O modules for PLC-5 systems. It provides reliable communication and power distribution for connected modules.
Technical Specifications
Chassis & Module Compatibility
| Attribute | Specification |
|---|---|
| Module Compatibility | 1771 I/O Modules |
| Number of Slots | 12 |
| Mounting Options | 19-inch rack mount or back-panel mount |
| Dimensions (H x W x D) | 339 x 484 x 217 mm (13.53 x 19.0 x 8.5 in) |
| Weight | 8.7 kg (19.1 lb) |
Communication & Power
| Attribute | Specification |
|---|---|
| Module Location | 1771 I/O chassis, leftmost slot |
| Chassis Distance |
2500 ft @ 230.4K Baud 5000 ft @ 115.2K Baud 10,000 ft @ 57.6K Baud |
| Interconnect Cable | 1770-CD |
| Power Dissipation | 5 Watts |
| Thermal Dissipation | 17.06 BTU/hr |
| Backplane Current | 1.0A @ 5V |
| Keying |
Upper Connector: Between 54 and 56 Lower Connector: Between 16 and 18 |
Environmental Conditions
| Attribute | Specification |
|---|---|
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature | -40 to 85°C (-40 to 185°F) |
| Relative Humidity | 5% to 95% (non-condensing) |
Field Wiring & Certification
| Attribute | Specification |
|---|---|
| Field Wiring Arm | Cat. No. 1771-WB |
| Field Wiring Arm Screw Torque | 7-9 pound-inches |
| Conductor Size | 20 AWG (0.5mm²) stranded copper, 1 wire per terminal |
| Remote I/O Cable | Blue cable (user-supplied) |
| Rack Restart Switch | 8252-A-B Part No. 740018-2315052-A-B Cat. No. 1770-XT |
| Termination Resistor | 20 AWG (0.5mm²) with 3/64" (1.2mm) insulation max |