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Allen-Bradley 1771-ASB/E Remote I/O Adapters
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- Part Number: 1771-ASB/E
- Brand: Allen-Bradley
- Type: Remote I/O Adapters
- Barcode: USA
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Product Description
Configured for serial scanning and remote chassis interface in PLC-5 Network systems, the Allen-Bradley 1771-ASB/E (1771-ASB Remote I/O Adapter) provides direct physical/electrical execution of remote rack backplane transactions.
Suffix Breakdown & Model Matrix
| Revision / Suffix | Series / Hardware Revision | Key Functional Differences |
|---|---|---|
| 1771-ASB | Base Hardware Series | Standard Remote I/O Adapter for 1771 Universal I/O Chassis |
| 1771-ASB/E | Series E Revision | Enhanced diagnostic processing and backplane communication compatibility |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-ASB/E |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 2.00 lbs (0.91 kg) |
| Dimensions | Standard 1771 Single-Slot Width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 5.0 W (1.0 A at 5 VDC backplane current) |
| Product Line | PLC-5 |
| Product Type | Remote I/O Adapters |
| Installation Slot | Leftmost slot of 1771 I/O chassis |
| Maximum Cable Distance | 10,000 cable feet |
| Maximum Baud Rate | 57.6K Baud (at 10,000 cable feet) |
| Addressing Methods | 1/2-Slot, 1-Slot, or 2-Slot addressing |
| Capacity | Up to 32 points per rack scan |
| Diagnostics | Enhanced status LED indicators |
Deterministic Network & Backplane Synchronization
The adapter governs backplane bus communication velocity and deterministic serial data transfer across extended physical distances. Connecting to the host controller via standard twinaxial cable, the module manages up to 32 I/O points across designated 1/2-slot, 1-slot, or 2-slot addressing matrix configurations. Firmware flash compatibility ensures synchronized communication protocols at baud rates up to 57.6K Baud over distances reaching 10,000 cable feet without compromising backplane scanning speed.
Frequently Asked Questions
Q: What are the backplane power supply requirements for the 1771-ASB/E?
A: The module draws 1.0 A at 5 VDC directly from the 1771 chassis backplane power supply. Ensure the local chassis power supply maintains sufficient capacity.
Q: In which slot of the 1771 chassis must the 1771-ASB/E be installed?
A: The adapter must strictly be installed in the leftmost slot (Slot 0) of the 1771 I/O chassis to manage backplane signal routing correctly.
Field Installation Guidelines
- Isolate main power from the 1771 chassis before installing or removing the adapter module to prevent backplane bus transients.
- Set onboard DIP switches and configuration jumpers for the designated baud rate, rack address, and primary/secondary adapter modes prior to insertion.
- Slide the module into the leftmost slot guide rails of the 1771 chassis until the backplane edge connector is firmly seated.
- Secure the top and bottom chassis latches to ensure proper mechanical mounting and continuous grounding.
- Wire the remote I/O twinaxial cable to the included field wiring arm terminals, verifying that 150-ohm terminating resistors are installed across the physical end-nodes of the RIO network trunk.
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