Overview
Engineers value the 1771-A1B for its simple installation and dependable performance in continuous production settings. In addition, the backplane design facilitates fast data communication between I/O modules, improving overall system response and reliability. Therefore, it remains a trusted solution for both new installations and legacy PLC-5 system maintenance.
Specification
| Parameter | Specification |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Family | PLC-5 / 1771 Series I/O System |
| Catalog Number | 1771-A1B (Series B) |
| Product Type | 4-Slot I/O Chassis Mounting Rack |
| Number of Slots | 4 I/O module slots + 1 power supply slot |
| Processor/Adapter Slot | Left-most slot reserved for PLC-5 processor or 1771 I/O adapter |
| Backplane Current Capacity | Up to 16 A at 5 V DC (maximum total for all modules) |
| Backplane Voltage | 5 V DC regulated |
| Power Supply Options | Compatible with 1771-P4, 1771-P5, 1771-P6, or external regulated 5 V DC power supply |
| Power Configuration | May use processor-integrated supply or stand-alone supply module (not both) |
| Mounting Type | Panel or rack mounting within an industrial enclosure |
| Mounting Orientation | Horizontal installation recommended for optimal airflow |
| Chassis Material | Heavy-duty aluminum and zinc-coated steel for EMI/RFI protection |
| Cooling Requirement | Natural convection or forced air when installed in dense cabinets |
| Operating Voltage Isolation | All backplane connections isolated from chassis ground |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Altitude Rating | Up to 2000 m (6560 ft) without performance derating |
| Vibration Resistance | 1 g @ 57–500 Hz |
| Shock Resistance | 15 g operational; 30 g non-operational |
| Environmental Protection | Designed for Pollution Degree 2, Overvoltage Category II |
| Certifications | UL Listed, CSA Certified, CE Marked |
| Compatible Systems | PLC-5 processors, 1771 I/O modules, and 1771 communication adapters |
| Typical Power Consumption | Depends on module configuration; up to 16 A at 5 V DC total load |
| Chassis Dimensions (Approx.) | 315 mm (12.4 in) W × 229 mm (9.0 in) H × 193 mm (7.6 in) D |
| Weight (Approx.) | 3.6 kg (8.0 lb) |
| Enclosure Type | Open type, for installation inside protective control cabinet |
| Grounding | Requires dedicated chassis ground connection for safety and noise immunity |
| Field Wiring | Module-dependent; wiring routed through front-mounted connectors |
| Cooling Clearance | Minimum 50 mm (2 in) above and below chassis recommended |
FAQ
No. It is designed specifically for PLC-5 and 1771 I/O systems, but can operate alongside newer systems through communication bridges.
Q2: Which power supply models work with the 1771-A1B chassis?
It supports 1771-P4, 1771-P5, and other compatible PLC-5 series power supplies.
Q3: Can the chassis operate in high-vibration environments?
Yes. Its reinforced metal frame and secure module locking design allow stable operation in industrial vibration conditions.
Q4: What is the recommended maintenance procedure?
Inspect connectors periodically, clean dust from slots, and ensure grounding integrity to maintain performance and reliability.
Manual/Datasheet PDF
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