For AVM78E-021K2A0BN-1212, EncoderWorks can provide a custom compatible replacement focused on binary SSI cable mapping, 12/12-bit position scaling, K2 axial cable routing, and Ø12 mm clamping-flange shaft fit. This model should not be treated like the KR terminal-compartment version. The same SSI logic applies, but cable length, conductor assignment, shield termination, and flameproof cable handling create a different replacement boundary.
The AVM78E-021K2A0BN-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, clamping flange, K2 2 m cable connection, and axial exit. The controller should continue reading 4096 steps per revolution across 4096 turns.
The first failure boundary is SSI cable accuracy. Clock+ / Clock- and Data+ / Data- must remain true RS422 differential pairs. If cable conductors, shield grounding, binary decoding, preset input, or counting-direction input are copied incorrectly, the SSI frame can be present while the PLC calculates the wrong absolute position.
This replacement fails when SSI communication is present, but the PLC reads the wrong position because cable 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 axial cable and clamping-flange mechanics. The Ø12 mm solid shaft, coupling fit, flange centering, axial cable clearance, PE grounding, and shaft load must be checked together. Cable strain must not force the encoder body or shaft during operation.
The replacement decision should first confirm binary SSI format, 12-bit singleturn and 12-bit multiturn mapping, K2 2 m axial cable assignment, 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, clamping-flange mounting, axial cable clearance, shield grounding, flameproof cable handling, and shaft load. EncoderWorks treats AVM78E-021K2A0BN-1212 as an industrial encoder custom compatible solution where SSI cable accuracy and clamping-flange mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | AVM78E-021K2A0BN-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 | Clamping flange |
| Connection | K2 cable, 9 strands, 2 m |
| Exit position | Axial |
| Protection focus | ATEX / IECEx flameproof enclosure, IP66 |
| Main engineering anchor | Binary SSI and K2 axial cable |
| Main failure boundary | Wrong cable mapping, binary decoding error, preset fault, cable preload |
