For BMMH 58S1G24C12/13B2A, EncoderWorks can provide a custom compatible replacement focused on Gray-code SSI pair integrity, 10–30 VDC signal compatibility, and suffix-level shaft/connection verification. This model should not be treated as a simple multiturn SSI encoder exchange. The encoder may return a stable data word, while the controller still reads the wrong position because Clock/Data pairing, Gray interpretation, zero setting, blind-hollow shaft fit, or the B2A mechanical/connection suffix was not reproduced correctly.
The BMMH 58S1G24C12/13B2A is a magnetic SSI multiturn absolute encoder configuration with 12-bit singleturn resolution and 13-bit multiturn range. The 24C element indicates a 10–30 VDC SSI execution, while G indicates Gray code. The series platform uses SSI clock input, RS422 data output, zero-setting input, and blind hollow shaft options up to ø15 mm. The published type structure also shows different radial connection choices and blind-hollow shaft sizes, so the final B2A suffix should be verified against the original label, drawing, or installed connector before production.
The first failure boundary is SSI pair wiring. Clock+ / Clock- and Data+ / Data- must remain true differential pairs from the encoder to the controller. If a replacement is wired by conductor color only, or if an extension cable breaks the pair structure, the SSI word may become shifted or unstable, especially at higher clock rates. A 120 Ω termination between Data+ and Data- on the control side should also be checked where required.
This replacement fails when SSI communication is present, but the PLC reads unstable or incorrect multiturn values because Data+/Data-, Clock+/Clock-, termination, or Gray-code interpretation does not match the original installation. That is a signal-chain failure, not a magnetic sensing failure.
The second boundary is zero setting. The zero input can reset the electrical reference within the encoder resolution. If the zero line is triggered during wiring, left in the wrong state, or connected to a “do not use” terminal, the machine can receive a stable but shifted absolute position.
Mechanically, the blind hollow shaft must match the original bore size and IP protection execution. Shaft insertion depth, torque support, spring washer mounting, radial connector clearance, and sealing class must be confirmed. IP67 versions can create more self-heating than IP65 versions, so high-speed and high-temperature applications should not ignore the installed protection class.
The replacement decision should first confirm B2A suffix meaning, blind-hollow shaft size, radial connection type, IP65/IP67 requirement, 10–30 VDC SSI supply, 12-bit singleturn and 13-bit multiturn mapping, Gray code setting, Clock/Data differential pair assignment, Data termination, zero input behavior, shield grounding, torque support, and shaft seating. EncoderWorks treats BMMH 58S1G24C12/13B2A as an industrial encoder custom compatible solution where SSI signal integrity and suffix-specific mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | BMMH 58S1G24C12/13B2A |
| 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, verify suffix execution |
| Connection | Verify B2A suffix against original unit |
| Protection class | Verify IP65 / IP67 execution |
| Control input | Zero setting input |
| Main engineering anchor | Gray SSI pairing and suffix verification |
| Main failure boundary | Wrong SSI pair mapping, zero-set error, suffix mismatch, shaft seating error |
