When replacing BMMH 58S1G24C12/13P2N, the EncoderWorks custom compatible replacement should first control Gray-code SSI M12 mapping, Ø12 mm blind hollow-shaft seating, and IP65 signal protection. This model should not be treated as a through-hollow-shaft encoder or as the same case as the M23 connector version. The M12 layout changes pin assignment, while the blind shaft requires correct insertion depth and clamping position.
The BMMH 58S1G24C12/13P2N is a magnetic SSI multiturn absolute encoder configuration with 12-bit singleturn resolution, 13-bit multiturn range, Gray code, and 10–30 VDC SSI supply. The P2N suffix should be confirmed as an IP65, Ø12 mm blind hollow shaft, radial M12 connector execution against the original label and installation drawing.
The first failure boundary is M12 SSI wiring. Clock+ / Clock- and Data+ / Data- must stay as differential pairs from the encoder to the controller. The M12 connector also carries supply, 0 V, zero input, and a do-not-use contact. If the SSI pairs are crossed, the shield path is weak, or the unused contact is connected, the controller may read shifted or intermittent multiturn values.
This replacement fails when SSI communication is present, but the PLC reads the wrong absolute position because M12 pin mapping, Clock/Data pair assignment, Gray-code interpretation, or data termination does not match the original installation. The encoder can be functional while the signal chain is wrong.
The second boundary is Ø12 mm blind hollow-shaft seating. A blind hollow shaft is not a through bore. The machine shaft must enter to the correct depth, remain inside the clamping zone, and avoid bottoming inside the encoder. Incorrect insertion can preload the bearing system or leave the clamping force in the wrong position.
Zero setting must also be protected. The zero input can shift the electrical reference within the encoder resolution. If it is triggered during wiring or tied to the wrong level, the machine receives a stable but offset position value.
The replacement decision should first confirm P2N suffix execution, Ø12 mm blind hollow-shaft fit, insertion depth, IP65 requirement, radial M12 connector layout, 10–30 VDC SSI supply, 12-bit singleturn and 13-bit multiturn mapping, Gray code setting, Clock/Data differential pair wiring, 120 Ω data termination, zero input behavior, shield grounding, torque support, and shaft seating. EncoderWorks treats BMMH 58S1G24C12/13P2N as an industrial encoder custom compatible solution where M12 SSI mapping and Ø12 blind-shaft mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | BMMH 58S1G24C12/13P2N |
| Encoder type | Multiturn absolute encoder |
| Interface | SSI |
| Sensor technology | Magnetic |
| Resolution | 12-bit singleturn + 13-bit multiturn |
| Code | Gray |
| Supply voltage | 10–30 VDC |
| Signal standard | SSI clock input, RS422 data output |
| Shaft type | Blind hollow shaft, not through hollow |
| Shaft size | Ø12 mm |
| Connection | Radial M12 connector |
| Protection class | IP65 |
| Control input | Zero setting input |
| Main engineering anchor | Gray SSI M12 and Ø12 blind shaft |
| Main failure boundary | Wrong M12 pin mapping, zero-set error, blind-shaft seating error, shield fault |
