BMMH 58S1G24C12/13B2N can be supported by EncoderWorks with a custom compatible replacement focused on Gray-code SSI M12 mapping, 10–30 VDC signal compatibility, and blind hollow-shaft seating. This model should not be treated as a through-hollow-shaft encoder. The mechanical interface must be checked as a blind hollow bore where shaft insertion depth, clamping position, and torque support decide whether the replacement will run without preload.
The BMMH 58S1G24C12/13B2N is a magnetic SSI multiturn absolute encoder configuration with 12-bit singleturn resolution and 13-bit multiturn range. The G element indicates Gray code, while 24C identifies the 10–30 VDC SSI execution. The N ending should be verified as the radial M12 connector execution against the original label and installed wiring, because M12 and M23 versions do not share the same connector layout.
The first failure boundary is SSI M12 pin mapping. Clock+ / Clock- and Data+ / Data- must remain true differential pairs from the encoder to the controller. The M12 pinout carries supply, ground, SSI clock, SSI data, zero input, and a do-not-use contact. If the do-not-use pin is connected, or if Clock and Data pairs are crossed, the controller may receive unstable or shifted absolute values.
This replacement fails when SSI communication is present, but the PLC reads incorrect multiturn values because M12 pin mapping, Clock/Data pair assignment, data termination, or Gray-code interpretation does not match the original installation. The encoder may be functional while the signal chain is wrong.
The second boundary is zero setting. The zero input can set the electrical reference within the encoder resolution. If the line is triggered during installation, tied to the wrong level, or confused with another M12 pin, the machine can receive a stable but offset position value.
Mechanically, the blind hollow shaft must match the original bore size and seating depth. It is not a through shaft; the machine shaft must not bottom out inside the encoder or sit outside the clamping zone. Torque pin or spring washer support should prevent housing rotation without forcing radial offset into the bearing system.
The replacement decision should first confirm the B2N suffix meaning, M12 radial connector layout, blind hollow-shaft diameter, insertion depth, IP65/IP67 execution, 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, and torque support. EncoderWorks treats BMMH 58S1G24C12/13B2N as an industrial encoder custom compatible solution where M12 SSI mapping and blind-shaft mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | BMMH 58S1G24C12/13B2N |
| 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 |
| Connection | Radial M12 connector, verify suffix execution |
| Protection class | Verify IP65 / IP67 execution |
| Control input | Zero setting input |
| Main engineering anchor | Gray SSI M12 mapping and blind shaft |
| Main failure boundary | Wrong M12 pin mapping, zero-set error, blind-shaft seating error, shield fault |
