BMMH 58S1G24C12/13P2A can be supported by EncoderWorks with a custom compatible replacement focused on Gray-code SSI M23 mapping, IP65 protection, and Ø12 mm blind hollow-shaft seating. This model should not be treated as a through-hollow-shaft encoder. The shaft does not pass through the encoder body; correct insertion depth, clamping position, and torque support are part of the replacement boundary.
The BMMH 58S1G24C12/13P2A 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 P2A suffix should be checked as an IP65, Ø12 mm blind hollow shaft, radial M23 connector execution against the original label, connector style, and mounting drawing.
The first failure boundary is M23 SSI mapping. Clock+ / Clock- and Data+ / Data- must stay as differential pairs from the encoder to the controller. The connector also carries supply, 0 V, zero input, and unused contacts. If the SSI pairs are crossed, shielding is weak, or an unused contact is wired, the controller may read unstable or shifted multiturn values.
This replacement fails when SSI communication is present, but the PLC reads the wrong absolute position because M23 pin mapping, Clock/Data pair assignment, Gray-code interpretation, or data termination does not match the original installation. The encoder may be functional while the signal chain is wrong.
The second boundary is Ø12 mm blind hollow-shaft seating. The machine shaft must enter to the correct depth, remain within the clamping zone, and avoid bottoming inside the bore. If the shaft is inserted too deeply or too shallowly, the bearing system can be preloaded and position stability can suffer.
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 controller can receive a stable but offset position value.
The replacement decision should first confirm P2A suffix execution, Ø12 mm blind hollow-shaft fit, insertion depth, IP65 requirement, radial M23 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 58S1G24C12/13P2A as an industrial encoder custom compatible solution where M23 SSI mapping and Ø12 blind-shaft mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | BMMH 58S1G24C12/13P2A |
| 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 M23 connector |
| Protection class | IP65 |
| Control input | Zero setting input |
| Main engineering anchor | Gray SSI M23 and Ø12 blind shaft |
| Main failure boundary | Wrong M23 pin mapping, zero-set error, blind-shaft seating error, shield fault |
