ASM58012 - 30-Bit Multiturn Absolute Encoder | Pepperl+Fuchs
MPN: ASM58012 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ASM58012 Overview
An absolute rotary encoder is a position sensor that outputs a unique digital code for every shaft angle, unlike incremental encoders which only emit pulses relative to a reference point. In a multiturn absolute encoder, the singleturn position is supplemented by a geared internal multi-turn counter, so the exact shaft position is retained even across power cycles and full shaft rotations. Within the measurement hierarchy, it belongs to the family: position sensor -> rotary encoder -> absolute rotary encoder -> multiturn absolute rotary encoder.
Key features include the 30-bit multiturn resolution, which resolves both fine angle and complete revolutions without external counters; the optically isolated RS-422 (SSI-compatible) interface, which protects the controller from ground potential differences in noisy industrial environments; transfer rates up to 2 MBaud for fast cyclic position polling; and a recessed hollow shaft that simplifies mechanical coupling to motor or machine shafts.
The ASM58-0 series uses optical scanning technology in a rugged industrial-grade housing, making it suitable for continuous duty on machines that demand repeatable absolute positioning. The zero-set function allows the operator to redefine the reference position electrically, eliminating time-consuming mechanical re-alignment during commissioning or after tooling changes.
Typical applications include servo drive and motion-control positioning, factory automation and robotics, cranes and hoisting equipment, and heavy machinery such as packaging lines and material handling systems, where loss of position after power-down would otherwise force a slow homing cycle.
When integrating the encoder, verify supply voltage, shaft diameter, and output code configuration against the exact ASM58-0 ordering code, since the family covers multiple electrical and mechanical variants under the same base designation.
This page synthesizes verified manufacturer data, family variant cross-references, and practical integration guidance not found on the manufacturer datasheet alone.
Drop-in alternatives for ASM58012 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ASM58I-F2AK1A0GN-1213
✅ Drop-In📋 Reference alternative (not in catalog)
ASM58N-F1AK1A0GN-1212
✅ Drop-In📋 Reference alternative (not in catalog)
ASM58-H
✅ Drop-In📋 Reference alternative (not in catalog)
ASM58012 Maximum Ratings & Electrical Characteristics
| Encoder Type | Multiturn absolute rotary encoder |
| Resolution | 30 Bit multiturn |
| Interface | RS 422, optically isolated |
| Data Transfer Rate | up to 2 MBaud |
| Housing Diameter | 58 mm |
| Shaft Type | Recessed hollow shaft |
| Zero-Set Function | Yes |
| Housing Style | Industrial standard |
| Scan Principle | Optical |
ASM58012 standard Pin Configuration Guide
Pin configuration for ASM58012 (standard package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ASM58012.
Refer to the datasheet for full pin configuration.
Typical Applications
ASM58012 is suitable for 6 applications: Servo Drive Positioning, Factory Automation and Robotics, Cranes and Hoisting Equipment, Packaging Machinery, Material Handling and Conveying, Test Benches and Industrial Machinery Retrofit.
Servo Drive Positioning
In servo drive and motion-control systems, the ASM58012 supplies the drive controller with a 30-bit multiturn absolute position value over its optically isolated RS-422 interface at up to 2 MBaud, fast enough for cyclic position feedback within each servo control cycle. Because the position is absolute, the axis is productive immediately after power-up without a homing routine, which is a decisive advantage on multi-axis machines where a full homing sequence delays startup by minutes. The recessed hollow shaft mounts directly over the motor shaft with a simple torque bracket, eliminating a flexible coupling and its associated misalignment errors. Designers should confirm the supply voltage and output code options of the exact ordering-code suffix and size cable shielding for the RS-422 differential signaling to preserve signal integrity over long motor-room cable runs.
Recommended
Factory Automation and Robotics
Factory automation lines and robotic axes demand exact joint and rotary-table positions that survive power interruptions, and the ASM58012 addresses this with its 30-bit multiturn absolute output: position is available the instant power returns, eliminating reference runs that would otherwise stop the entire line. The optically isolated RS-422 interface at up to 2 MBaud tolerates the electrically noisy environment created by VFDs, contactors, and weld controllers on the plant floor, and the isolation prevents ground-loop currents from corrupting the position data over long cable runs to the PLC. The zero-set function lets commissioning engineers redefine the reference position electrically after tooling changes, cutting changeover time. Integration effort centers on matching the housing and hollow-shaft dimensions to the robot joint mechanics and confirming the RS-422 termination at the controller side.
Recommended
Cranes and Hoisting Equipment
Cranes, hoists, and vertical lifting gear must retain absolute drum position through power loss for safety and repositioning accuracy. The ASM58012's 30-bit multiturn measurement tracks both drum rotation angle and total revolutions, so the load hook position is known at power restoration without re-referencing. Its industrial standard ∅58 mm housing is designed for the vibration and mechanical stress typical of heavy machinery duty, and the optically isolated RS-422 link at up to 2 MBaud delivers position data reliably to the crane controller over the long cable distances found on gantry and overhead cranes. The recessed hollow shaft mounts over the rope-drum shaft with a torque bracket, keeping the installation compact. Engineers should verify the ordering-code supply range against the crane control system and provide appropriate cable strain relief for mobile applications.
Recommended
Packaging Machinery
High-speed packaging machines use rotary tables, cam shafts, and winding axes where repeatable absolute positioning directly determines registration accuracy of print, cut, and fill operations. The ASM58012 supplies 30-bit multiturn absolute position to the machine controller over RS-422 at up to 2 MBaud, enabling precise electronic cam synchronization each cycle without homing delays after every shift restart or emergency stop. The zero-set function is particularly valuable on packaging lines: after a format change, the operator redefines the machine datum electrically in seconds instead of mechanically re-aligning the encoder coupling. The optically isolated interface withstands the noise from servo drives and sealing heaters packed inside packaging machines. Confirm hollow-shaft bore size against the machine shaft and select the ordering-code suffix matching the 24 V DC control power typically available on such machines.
Recommended
Material Handling and Conveying
Material handling systems such as sorters, storage-and-retrieval cranes, and turntables require reliable absolute position feedback to route product correctly and prevent collisions. The ASM58012 provides a 30-bit multiturn absolute position value that is instantly available at power-up, so a distribution center restarts without lengthy axis referencing. Its optically isolated RS-422 interface at up to 2 MBaud supports the long cable distances between drive cabinets and conveyor drives typical of warehouse installations, and the isolation protects against the ground potential differences that arise across large facilities. The robust ∅58 mm industrial housing with recessed hollow shaft suits shaft-end mounting on conveyor drive rollers and turntable gearboxes. Integration should verify the supply-voltage suffix and provide RS-422 termination and shielded cabling for maximum noise immunity in the warehouse environment.
Recommended
Test Benches and Industrial Machinery Retrofit
Test benches, rotary indexing fixtures, and legacy machinery retrofits benefit from the ASM58012's combination of high 30-bit multiturn resolution and a widely supported optically isolated RS-422 serial interface at up to 2 MBaud, which most PLC, motion-controller, and data-acquisition platforms can read directly or through a standard SSI/R interface module. In retrofit projects, the zero-set function lets integrators establish the new machine datum purely electrically after installation, avoiding physical re-adjustment of the encoder. The standard ∅58 mm housing footprint matches the mounting dimensions common to the industrial encoder class, simplifying replacement of older multiturn units. Because the ASM58 family spans multiple suffix configurations, integrators should match supply voltage, code sequence, and connector type to the existing controller wiring before ordering, and account for the 2 MBaud maximum data rate in high-speed polling designs.
Recommended
Recommended Products Summary
Engineering reference data for ASM58012 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ASM58I-F2AK1A0GN-1213 | ASM58N-F1AK1A0GN-1212 | ASM58-H |
|---|---|---|---|---|
| Package | ∅58 mm industrial standard housing, recessed hollow shaft | ∅58 mm industrial standard housing - same family | ∅58 mm industrial standard housing - same family | ∅58 mm industrial standard housing - same family |
| Brand | Pepperl+Fuchs Inc. | Pepperl+Fuchs Inc. | Pepperl+Fuchs Inc. | Pepperl+Fuchs Inc. |
Key Differentiators
- 30-bit multiturn absolute output retains position through power loss (vs incremental encoders of equivalent ∅58 mm housing class)
- Optically isolated RS-422 up to 2 MBaud (vs ASM58-H)
- Zero-set function simplifies commissioning (vs ASM58I-F2AK1A0GN-1213)
Design Notes
The ASM58012 transmits its 30-bit multiturn position over an optically isolated RS-422 interface at up to 2 MBaud. Use twisted-pair shielded cable for the differential RS-422 signals, ground the shield at the controller end only to avoid ground loops, and terminate the differential pair per the controller receiver requirements at 2 MBaud line lengths. The optical isolation protects against ground potential differences across large machines, but the isolation is defeated if the shield is grounded at both ends without isolation practices.
The ASM58 family covers many suffix configurations (supply voltage, output code, connector, shaft diameter) under the ASM58-0 base designation. Do not assume a same-family part is interchangeable: verify supply voltage, output electrical level and code format, connection type, and hollow-shaft bore against the specific ASM58012 ordering code before substitution. Also note that ASM58012 must not be confused with the unrelated Microchip SY58012U clock buffer IC, which appears alongside it in parametric searches.
Mechanical installation of this hollow-shaft encoder drives reliability more than electronics. Mount the ∅58 mm housing over the machine shaft with the manufacturer-recommended torque bracket or stator pin so housing rotation is prevented without imposing axial or radial loads on the internal bearings. Use the zero-set function during commissioning to establish the electrical datum instead of mechanically rotating the encoder, and recheck shaft coupling tightness after the first thermal cycle of the machine.
Compliance Information
Compliance statements for the specific ASM58012 ordering code were not stated in the retrieved web data and must be obtained from Pepperl+Fuchs certificates of conformity.
