Features:
- Provides structured remote I/O scanning and data exchange through PLC-2 compatible architecture.
- Supports configurable fault handling with independent and dependent control modes across multiple I/O chassis.
- Enables long-distance communication with defined transmission rates and structured block-transfer data mapping.
The Allen-Bradley 1771-SN module is designed for remote I/O communication within rack-based PLC systems, ensuring coordinated data exchange between processors and distributed I/O chassis. The Allen-Bradley 1771-SN operates within defined chassis compatibility and supports structured rack addressing for system organization. Its communication framework is based on block-transfer instructions that ensure consistent data movement across the control network.
In system operation, the 1771-SN supports multiple adapter devices while maintaining synchronized communication rates across the entire remote I/O link. The Allen-Bradley 1771-SN manages both input and output data through predefined word structures, ensuring that each rack and group is mapped correctly within the PLC data file. Reserved word areas provide system-level fault and status information for monitoring and diagnostics.
From an industrial integration perspective, the Allen-Bradley 1771-SN enables flexible configuration of fault response behavior depending on system requirements. The module supports independent operation between racks or coordinated fault response in dependent mode. Through structured block-transfer handling, the 1771-SN ensures consistent communication behavior across distributed I/O architectures, supporting stable PLC system operation.
The 1771-SN Allen-Bradley Sub I/O Scanner Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1771-SN Sub I/O Scanner Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1771-SN Sub I/O Scanner Module Specs
General
- Manufacturer Allen-Bradley
- Model 1771-SN
- Condition New Original ready stock
- Product Family 1771-AS,1771-A4,1771-A4E
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Distributed Control: Used to extend the I/O control range of PLC-5 or similar control systems to remote locations, managing equipment distributed across different locations within a factory through a single remote I/O link.
- System Expansion: When backplane slots are insufficient, add up to 896 remote digital I/O points via the 1771-SN for large-scale system expansion.
- Remote Monitoring: Communicate with remote 1771-ASB adapters over distances up to 10,000 feet (approximately 3048 meters) to collect field sensor signals and drive actuators.
- Device Integration: Integrate different types of 1771 digital or analog I/O modules into a unified remote link, reducing field cabling costs and increasing system maintenance flexibility.
- DIP Switch Settings: The communication rate (e.g., 57.6kbps or 115.2kbps) and fault control mode can be adjusted via switch groups 0 and 1 at the cutout on the left side of the module.
- Rack Addressing: Configure Sub I/O scanners in the PLC program, supporting up to 7 logical rack addresses (in 1/4 rack increments), and connecting up to 16 remote adapters.
- Ladder Diagram Programming: Use BTW (Block Transfer Write) instructions to transfer configuration data and output mappings to the module, and use BTR (Block Transfer Read) instructions to read remote input status.
- Hardware Installation: Insert the module into any slot of the 1771 general-purpose I/O rack (except the first slot on the left, which is reserved for a processor or adapter), and connect the 1770-CD remote I/O cable.
- Environmental Rating: This equipment is suitable for industrial environments of pollution level 2 as defined by IEC 60664-1, and applications in overvoltage category II.
- Electromagnetic Compatibility (EMC): Complies with Council Directive 89/336/EEC, and is suitable for industrial environments under EN 50081-2 and EN 50082-2 standards.
- Safety Certification: As an "open" device, it must be installed in a properly designed cabinet to prevent personnel from contacting live parts and to meet specific environmental protection requirements.
- Low Voltage Directive: Meets the requirements and tests for programmable controller devices according to EN 61131-2, and complies with Council Directive 73/23/EEC.