1771-A3B Advantages
The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis stands out from comparable 1771 chassis in several key areas.
High-density 12-slot layout design. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis has 12 slots, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis can accommodate more I/O and special modules for medium-sized PLC‑5 control stations.
Universal 1771 backplane compatibility. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis supports all standard series A and B 1771 I/O and special modules, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis can work with both local CPU and remote I/O adapter setups.
Robust passive backplane structure. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is a passive chassis without active electronic components, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis has high stability and low failure rate for long-term legacy system operation.
High backplane current capacity. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis supports up to 21A @5V DC backplane load, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis can support multiple high-power analog and intelligent modules.
Simple panel mounting. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is designed for direct cabinet back-panel installation, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis simplifies cabinet wiring layout.
Classic PLC‑5 ecosystem support. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is a standard large chassis for classic PLC‑5 controllers, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is widely used for maintenance and retrofit of old automation lines.
1771-A3B Applications
Legacy PLC‑5 medium process control chassis. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is a universal high-density I/O rack within Allen‑Bradley 1771 PLC‑5 systems, the Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis holds processor, power supply and mixed I/O modules for continuous process control.
Packaging and material handling retrofitting projects. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is used to rebuild spare chassis for older conveyor, sorting and packaging machines running PLC‑5 controllers with large I/O requirements.
Water and wastewater process control cabinets. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis provides stable backplane platform for analog measurement, valve control and interlock I/O in PLC‑5 based water treatment skids.
Remote I/O slave chassis for PLC‑5 systems. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis can be fitted with 1771‑ASB adapter to build high-capacity remote I/O racks extending PLC‑5 control distance.
Spare replacement for end-of-life automation equipment. The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis is stocked as spare-replacement unit for existing 1771-A3B Ser B field installations to reduce production downtime.
1771-A3B Certifications & Compliance
The Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis holds the following international safety and compliance approvals:
UL listed — North‑American industrial control equipment safety approval.
CE certification — European industrial control equipment safety and EMC compliance.
C‑Tick marked — EMC compliance for Australian and New Zealand markets.
Class I Division 2 certified — Suitable for installation in specified hazardous classified locations.
All units supplied are 100% new original Allen‑Bradley parts. Every Allen‑Bradley 1771-A3B Ser B 12-slot I/O chassis unit is functionally tested before dispatch, packed in professional anti-static packaging, and covered by a one-year warranty from the date of delivery.
