A custom compatible replacement for BMSH 58S1G24C12/00B2A can be supplied by EncoderWorks with the main check placed on Gray-code SSI M23 mapping, 12-bit singleturn word length, and Ø15 mm blind hollow-shaft seating. This model should not be treated as a multiturn 12/13 encoder. The controller expects a singleturn SSI position word, so the replacement must preserve word length, Gray-code interpretation, zero input behavior, and blind-shaft mechanics.
The BMSH 58S1G24C12/00B2A is a magnetic SSI singleturn absolute encoder configuration with 12-bit singleturn resolution, Gray code, and 10–30 VDC SSI supply. The B2A suffix should be checked as a radial M23 connector execution with Ø15 mm blind hollow shaft against the original label, installed connector, and mounting drawing.
The first failure boundary is SSI word length. A 12-bit singleturn encoder must not be replaced with a multiturn data structure unless the controller project is changed. If the receiver expects a 12-bit angular word but receives a longer or differently aligned SSI frame, the decoded position may be stable but wrong.
This replacement fails when SSI communication is present, but the PLC reads the wrong angular value because M23 pin mapping, Clock/Data pair assignment, Gray-code interpretation, or SSI word length does not match the original encoder. The sensing element may be healthy while the signal chain is wrong.
The second boundary is Ø15 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. If the shaft is inserted too deeply or too shallowly, the bearing system can be preloaded and the output can become unstable under vibration.
Zero setting must also be protected. The zero input can shift the electrical reference within the encoder resolution. If this line is triggered during wiring or tied to the wrong level, the controller can receive a clean but offset singleturn position.
The replacement decision should first confirm B2A suffix execution, Ø15 mm blind hollow-shaft fit, insertion depth, radial M23 connector layout, IP65/IP67 requirement, 10–30 VDC SSI supply, 12-bit singleturn 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 BMSH 58S1G24C12/00B2A as an industrial encoder custom compatible solution where singleturn SSI mapping and Ø15 blind-shaft mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | BMSH 58S1G24C12/00B2A |
| Encoder type | Singleturn absolute encoder |
| Interface | SSI |
| Sensor technology | Magnetic |
| Resolution | 12-bit singleturn |
| 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 | Ø15 mm |
| Connection | Radial M23 connector |
| Protection class | Verify IP65 / IP67 execution |
| Control input | Zero setting input |
| Main engineering anchor | Gray SSI M23 and Ø15 blind shaft |
| Main failure boundary | Wrong SSI word length, M23 mapping error, zero-set error, blind-shaft seating error |
