High-Precision Absolute Position Feedback for Industrial Motion Systems
The Allen Bradley 1734-SSI Encoder Input Module is a POINT I/O specialty interface designed to acquire high-resolution position data from absolute encoders using the Synchronous Serial Interface (SSI) protocol. It is engineered for motion control, positioning systems, and precision automation applications where accurate real-time feedback is essential.
By supporting RS-422-based SSI communication, the module enables reliable data exchange with absolute rotary and linear encoders, making it a strong fit for servo-driven machinery, packaging equipment, and high-speed industrial positioning systems. Its compact POINT I/O format allows direct integration into distributed control architectures while maintaining installation flexibility and scalable system design.
This module is widely used in modern automation environments that require stable encoder feedback, configurable data formats, and robust industrial communication performance.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Allen Bradley |
| Product Family | POINT I/O |
| Model Number | 1734-SSI |
| Module Type | SSI Absolute Encoder Input Module |
| Channels | 1 SSI Channel |
| Communication Protocol | SSI (Synchronous Serial Interface) |
| Physical Interface | RS-422 |
| Supported Encoders | Absolute rotary, linear, optical encoders |
| Supply Voltage | 24V DC (10–28.8V DC range) |
| Data Rate | 125 kHz to 2 MHz (selectable) |
| Word Length | Up to 32 bits |
| Encoding | Gray or binary (convertible) |
| Mounting | DIN rail via POINT I/O base |
| Compatible Bases | 1734-TB / 1734-TBS (Key position 2) |
| Operating Temperature | -20°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Dimensions | 56 mm × 12 mm × 75.5 mm |
| Weight | Approx. 0.1–0.5 kg (variant dependent) |
Applications
The 1734-SSI module is widely deployed in automation systems that require accurate and stable position feedback from absolute encoders.
Typical applications include:
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Servo-driven motion control systems
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CNC and precision machining equipment
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Packaging and labeling machines
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Conveyor positioning systems
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Robotics and pick-and-place systems
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Material handling automation
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Printing and web tension control systems
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High-speed indexing machinery
Its ability to process absolute position data makes it especially valuable in systems where restart position retention and high-resolution tracking are required.
Advantages
High-Accuracy Position Feedback
The module enables precise acquisition of absolute position data, improving motion control accuracy in high-speed industrial systems.
Flexible Encoder Compatibility
Supports multiple encoder formats, including gray and binary SSI data, allowing integration with a wide range of industrial encoder types.
Configurable Communication Speed
Selectable data rates up to 2 MHz provide flexibility for different cable lengths and system performance requirements.
Compact Distributed Architecture
POINT I/O design reduces wiring complexity and supports modular expansion in decentralized control systems.
Reliable Industrial Communication
RS-422 differential signaling improves noise resistance in electrically harsh environments.
Efficient System Integration
Works seamlessly with Allen Bradley Logix-based controllers for streamlined motion and automation control.
Technical FAQs
1. What is the main function of the 1734-SSI module?
It reads absolute position data from SSI-compatible encoders and sends it to the control system.
2. How many encoder channels does it support?
It supports one SSI encoder input channel.
3. What type of encoders can be connected?
Absolute rotary, linear, and optical encoders that support SSI protocol.
4. What communication standard does it use?
It uses the Synchronous Serial Interface (SSI) over RS-422 signaling.
5. What is the typical voltage range?
It operates on 24V DC, typically within 10–28.8V DC range.
6. Does it support both Gray and binary code?
Yes, it supports both formats with conversion capability.
7. What is the maximum data rate?
Up to 2 MHz depending on configuration.
8. Is it suitable for harsh industrial environments?
Yes, it is designed for standard industrial temperature, vibration, and electrical noise conditions.
9. What mounting system is required?
It mounts on a POINT I/O base using DIN rail installation.
10. What industries commonly use it?
Manufacturing, robotics, packaging, CNC machining, and material handling industries.
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