Product Overview
The Allen-Bradley 1746-HSRV is a single-axis, closed-loop servo control module designed for the SLC 500 programmable controller platform. As a specialty I/O module that occupies a single slot in the SLC rack, the 1746-HSRV bridges the gap between the SLC processor‘s discrete logic capabilities and the precise motion requirements of industrial servo systems. The module provides an analog velocity command with programmable limits up to ±10V DC, enabling direct interface with a wide range of Allen-Bradley servo drives including the 1386, 1388, 1389, 1391, 1392, 1394, and 1398 ULTRA series .
The 1746-HSRV operates as a 12-word input/output specialty module, communicating with the SLC processor via M-files for configuration and command data transfer . Once initialized, motion block execution runs independently of the processor scan time, allowing complex move profiles to execute without being constrained by ladder logic scan cycles . The module supports a comprehensive command set including absolute moves, incremental moves, speed moves, homing operations, blended moves, and emergency stop functions, making the 1746-HSRV suitable for applications ranging from simple point-to-point positioning to multi-segment motion profiles .
Compatible with SLC 5/03, 5/04, and 5/05 processors running firmware revision 5.0 or higher, the 1746-HSRV is configured using RSLogix 500, AI500, or APS software . The module requires the 1746-HT termination panel and 1746-HCA cable for field wiring, providing a structured interface for encoder feedback, drive command signals, fast inputs, fast outputs, and E-stop circuitry . Although discontinued by Rockwell Automation, the 1746-HSRV remains widely deployed in existing SLC 500 installations and is supported through refurbished units, repair services, and surplus inventory channels .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1746-HSRV |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | SLC 500 Servo Control Module |
| Compatible Processors | SLC 5/03, 5/04, 5/05 (FRN 5.0 or higher) |
| Module Type | Single-Slot Specialty I/O |
| Input Words | 12 Words (Maximum) |
| Output Words | 12 Words (Maximum) |
| Number of Axes | 1 |
| Fast Inputs | 3 (24V DC general-purpose local fast inputs) |
| Fast Outputs | 1 (24V DC general-purpose local fast output) |
| Encoder Input Frequency | 300 kHz @ 0° Quadrature Error |
| Analog Velocity Command | Programmable Limits up to ±10V DC |
| Backplane Current (5V DC) | 300 mA |
| Module Update Time | 2 ms |
| Step Response | 100 ms in, 2.5 ms out |
| Absolute Position Range | 32-bit register |
| Operating Modes | Configuration Mode, Command Mode |
| Installation Slot | As close as possible to processor (Slot 1 recommended) |
| Max Modules per Rack | 12 |
| Terminal Panel | 1746-HT |
| Cable | 1746-HCA |
| Operating Temperature | 0…+60°C (+32…+140°F) |
| Storage Temperature | -40…+85°C (-40…+185°F) |
| Relative Humidity | 5 to 95% (non-condensing) |
| Thermal Dissipation | 1.5 W |
| Certifications | UL / C-UL Listed Class I, Division 2, Groups A, B, C, D; CE Marked |
| Lifecycle Status | Discontinued by Manufacturer |