For AVM78E-022KRA0BN-1212, EncoderWorks can provide a custom compatible replacement focused on binary SSI mapping, 12/12-bit position scaling, terminal-compartment wiring, and Ø12 mm servo-flange shaft fit. This model should not be treated like a clamping-flange version or a cable-exit-only encoder. The replacement boundary is whether the PLC receives the same binary absolute word while the flameproof terminal entry, shaft geometry, and flange reference remain correct.
The AVM78E-022KRA0BN-1212 is an explosion-proof SSI multiturn absolute rotary encoder configuration with binary code, 12-bit singleturn resolution, 12-bit multiturn range, 10–30 VDC supply, aluminum housing execution, Ø12 mm x 25 mm solid shaft, servo flange, KR terminal compartment, and axial exit arrangement. The controller should continue reading 4096 steps per revolution across 4096 turns.
The first failure boundary is SSI terminal mapping. Clock+ / Clock- and Data+ / Data- must remain true RS422 differential pairs. If terminal numbers, cable shield, preset input, or counting-direction input are copied incorrectly, the SSI signal can be present while the decoded absolute position is wrong.
This replacement fails when SSI communication is present, but the PLC reads the wrong position because terminal assignment, binary decoding, 12/12-bit word length, monoflop timing, preset input, or counting direction does not match the original encoder. That is a signal-chain and parameter failure, not simply a sensing failure.
The second boundary is flameproof servo-flange mechanics. The Ø12 mm solid shaft and servo flange must match the coupling and mounting reference. Axial and radial shaft load must remain within limits, and the cable gland or terminal-entry handling must not compromise the hazardous-area installation.
The replacement decision should first confirm binary SSI format, 12-bit singleturn and 12-bit multiturn mapping, KR terminal-compartment wiring, Clock/Data differential pairs, 20 ±10 µs monoflop behavior, 10–30 VDC supply, PRESET zero-set input, counting-direction input, aluminum housing execution, Ø12 mm solid-shaft fit, servo-flange mounting, axial exit clearance, shield grounding, flameproof cable entry, and shaft load. EncoderWorks treats AVM78E-022KRA0BN-1212 as an industrial encoder custom compatible solution where SSI terminal accuracy and servo-flange mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | AVM78E-022KRA0BN-1212 |
| Encoder type | Explosion-proof multiturn absolute rotary encoder |
| Interface | SSI / RS422 |
| Resolution | 12-bit singleturn + 12-bit multiturn |
| Position range | 4096 steps x 4096 turns |
| Code | Binary |
| Supply voltage | 10–30 VDC |
| Transfer rate | 0.1–2 MBit/s |
| Housing execution | Aluminum |
| Shaft type | Solid shaft |
| Shaft size | Ø12 mm x 25 mm |
| Flange | Servo flange |
| Connection | KR terminal compartment |
| Exit position | Axial |
| Protection focus | ATEX / IECEx flameproof enclosure, IP66 |
| Main engineering anchor | Binary SSI and servo flange |
| Main failure boundary | Wrong terminal mapping, binary decoding error, preset fault, flange mismatch |
