FSM58N-F3AK2R3GN-1213 can be supported by EncoderWorks with a custom compatible replacement built around 25-bit Gray parallel cable mapping, radial K2 cable routing, and Ø15 mm recessed hollow-shaft fit. This model should not be treated as a normal absolute encoder replacement. The real risk is that the controller may receive active data outputs, but the 25-bit word, V/R direction logic, LATCH state, or PRESET behavior no longer matches the original machine.
The FSM58N-F3AK2R3GN-1213 is a multiturn absolute encoder with fast parallel push-pull output, aluminum housing, F3A Ø15 mm recessed hollow shaft, K2 cable connection, radial exit direction, Gray code, and V/R, LATCH, PRESET inputs. The FSM58 series is designed for high-speed direct position data transfer, with a 25-bit multiturn data structure and code change frequency up to 400 kHz. It uses short-circuit-protected push-pull parallel outputs rather than a fieldbus interface.
The first failure boundary is Gray-code cable mapping. With a K2 cable version, the installer does not have a connector pin layout to visually confirm at the encoder body. Data bit 1 through Data bit 25, Ub, GND, V/R, LATCH, and PRESET must be assigned by signal function. If the old cabinet wiring is copied only by conductor color, previous repairs or junction-box changes can shift the data word.
This replacement fails when all parallel outputs switch correctly, but the controller decodes the wrong absolute position because Gray-code bit order or cable mapping does not match the original 25-bit read logic. The encoder is not dead; the machine is reading the wrong word.
The second boundary is LATCH timing. LATCH freezes the parallel data word so the controller can read a stable position value. If the controller expects latched data and the replacement is left free-running, read errors can appear during fast motion or near bit transitions. For Gray code, this risk is lower than binary, but it is not zero when the data word is sampled incorrectly.
V/R and PRESET are also not spare wires. V/R changes the counting direction, while PRESET electronically sets the encoder value to zero. A wrong PRESET state can create a false machine zero, and a wrong V/R state can reverse the position logic without creating an electrical fault. The datasheet defines these three inputs separately from the parallel data outputs.
Mechanically, the Ø15 mm recessed hollow shaft gives a larger interface, but the torque rest must remain free. It should stop housing rotation without pulling the encoder body into alignment. If shaft eccentricity or torque-rest preload is forced into the housing, the output word may become unstable under vibration or speed change.
The replacement decision should first confirm F3A Ø15 mm shaft fit, torque-rest freedom, K2 radial cable routing, 25-bit Gray data order, V/R direction logic, LATCH pulse timing, PRESET behavior, supply voltage, shielding, and controller input thresholds. EncoderWorks treats FSM58N-F3AK2R3GN-1213 as an industrial encoder custom compatible solution where Gray-code cable mapping and hollow-shaft mechanics must be verified together.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | FSM58N-F3AK2R3GN-1213 |
| Encoder type | Multiturn absolute encoder |
| Interface | Fast parallel push-pull |
| Housing | Ø58 mm aluminum housing |
| Shaft type | Recessed hollow shaft |
| Shaft size | F3A, Ø15 mm x 30 mm |
| Connection | K2 Ø9 mm cable |
| Exit direction | Radial |
| Output code | Gray code |
| Resolution | 13-bit singleturn + 12-bit multiturn / 25 bit total |
| Operating voltage | 10–30 VDC |
| Code change frequency | Up to 400 kHz |
| Inputs | V/R, LATCH, PRESET |
| Main engineering anchor | 25-bit Gray parallel cable mapping and Ø15 shaft fit |
| Main failure boundary | Wrong cable mapping, unstable LATCH read, PRESET error, torque-rest preload |
