Allen-Bradley 1771-ASB Universal Remote I/O Adapter Module
The Allen-Bradley 1771-ASB, also cataloged as the 1771-ASB I/O Adapter Module, operates as a dedicated hardware component for high-speed serial communication transfer within Allen-Bradley Universal Remote I/O (RIO) networks. The unit functions as a communication interface between a primary PLC-5 processor (or scanner module) and field I/O modules housed in a local or remote 1771 I/O chassis. It executes real-time backplane data conversion and block transfers while drawing 1.2 A at 5 VDC directly from the local chassis backplane logic bus.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-ASB |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.54 lbs (0.70 kg) |
| Dimensions | 11.5 in x 4.5 in x 2.0 in (29.2 cm x 11.4 cm x 5.1 cm) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 1.2 A @ 5 VDC (Backplane) |
| Product Type | Universal Remote I/O Adapter Module |
| Network Interface | Allen-Bradley Universal Remote I/O (RIO) |
| Mounting Style | Rack Mount (1771 Chassis Leftmost Slot) |
| Terminal Style | Screw Terminals |
Backplane Bus Communication & Deterministic Processing
The Allen-Bradley 1771-ASB manages backplane bus communication velocity across the 1771 I/O chassis by serializing discrete and block transfer data sent over the Universal Remote I/O network. Configured for deterministic scan execution, the adapter synchronizes discrete input/output image tables with primary host controllers across long distance cable runs. Onboard DIP switches configure rack addressing, baud rates (57.6 kbps, 115.2 kbps, or 230.4 kbps), and active I/O density scaling without requiring dedicated configuration software, maintaining deterministic update schedules across distributed architecture layouts.
Frequently Asked Questions
Q: What is the backplane power current requirement for the 1771-ASB adapter?
A: The module requires 1.2 A at 5 VDC supplied directly from the 1771 power supply via the chassis backplane. System designers must include this load when calculating total backplane power supply sizing.
Q: In which slot of the 1771 I/O chassis must the 1771-ASB be installed?
A: The 1771-ASB must always be installed in the leftmost slot (Slot 0) of the 1771 I/O chassis to manage internal backplane addressing and signal routing to adjacent I/O modules properly.
Field Installation Guidelines
- Power Isolation: Turn off all chassis and field power sources prior to inserting or removing the 1771-ASB module. Never insert or remove the adapter module while backplane power is active.
- DIP Switch Configuration: Configure the onboard DIP switch banks for the correct RIO rack address, primary/complementary rack configuration, communication baud rate, and last-state hold conditions before mounting the unit.
- Chassis Keying: Insert plastic keying bands into the chassis backplane connector at designated keying positions to ensure correct alignment and prevent accidental insertion of standard I/O modules into the adapter slot.
- Wiring & Shield Termination: Connect the RIO link cable (Belden 9463 twinaxial) to the 3-pin screw terminal connector on the front of the adapter. Connect Blue to terminal 1, Shield to terminal 2, and Clear to terminal 3. Ensure the cable shield is grounded at the primary scanner end and continuously daisy-chained without multi-point chassis grounding. Terminate the physical ends of the line with a 1/2-watt terminating resistor across terminals 1 and 3 (150 ohm for 57.6/115.2 kbps, 82 ohm for 230.4 kbps).
Allen-Bradley 1771-ASB Universal Remote I/O Adapter Module
Allen-Bradley 1771-ASB Universal Remote I/O Adapter Module
The Allen-Bradley 1771-ASB, also cataloged as the 1771-ASB I/O Adapter Module, operates as a dedicated hardware component for high-speed serial communication transfer within Allen-Bradley Universal Remote I/O (RIO) networks. The unit functions as a communication interface between a primary PLC-5 processor (or scanner module) and field I/O modules housed in a local or remote 1771 I/O chassis. It executes real-time backplane data conversion and block transfers while drawing 1.2 A at 5 VDC directly from the local chassis backplane logic bus.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-ASB |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.54 lbs (0.70 kg) |
| Dimensions | 11.5 in x 4.5 in x 2.0 in (29.2 cm x 11.4 cm x 5.1 cm) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 1.2 A @ 5 VDC (Backplane) |
| Product Type | Universal Remote I/O Adapter Module |
| Network Interface | Allen-Bradley Universal Remote I/O (RIO) |
| Mounting Style | Rack Mount (1771 Chassis Leftmost Slot) |
| Terminal Style | Screw Terminals |
Backplane Bus Communication & Deterministic Processing
The Allen-Bradley 1771-ASB manages backplane bus communication velocity across the 1771 I/O chassis by serializing discrete and block transfer data sent over the Universal Remote I/O network. Configured for deterministic scan execution, the adapter synchronizes discrete input/output image tables with primary host controllers across long distance cable runs. Onboard DIP switches configure rack addressing, baud rates (57.6 kbps, 115.2 kbps, or 230.4 kbps), and active I/O density scaling without requiring dedicated configuration software, maintaining deterministic update schedules across distributed architecture layouts.
Frequently Asked Questions
Q: What is the backplane power current requirement for the 1771-ASB adapter?
A: The module requires 1.2 A at 5 VDC supplied directly from the 1771 power supply via the chassis backplane. System designers must include this load when calculating total backplane power supply sizing.
Q: In which slot of the 1771 I/O chassis must the 1771-ASB be installed?
A: The 1771-ASB must always be installed in the leftmost slot (Slot 0) of the 1771 I/O chassis to manage internal backplane addressing and signal routing to adjacent I/O modules properly.
Field Installation Guidelines
- Power Isolation: Turn off all chassis and field power sources prior to inserting or removing the 1771-ASB module. Never insert or remove the adapter module while backplane power is active.
- DIP Switch Configuration: Configure the onboard DIP switch banks for the correct RIO rack address, primary/complementary rack configuration, communication baud rate, and last-state hold conditions before mounting the unit.
- Chassis Keying: Insert plastic keying bands into the chassis backplane connector at designated keying positions to ensure correct alignment and prevent accidental insertion of standard I/O modules into the adapter slot.
- Wiring & Shield Termination: Connect the RIO link cable (Belden 9463 twinaxial) to the 3-pin screw terminal connector on the front of the adapter. Connect Blue to terminal 1, Shield to terminal 2, and Clear to terminal 3. Ensure the cable shield is grounded at the primary scanner end and continuously daisy-chained without multi-point chassis grounding. Terminate the physical ends of the line with a 1/2-watt terminating resistor across terminals 1 and 3 (150 ohm for 57.6/115.2 kbps, 82 ohm for 230.4 kbps).
