EncoderWorks develops the ESM78E-F8AKRREBI-1213 custom compatible replacement solution around explosion-proof PROFINET multiturn feedback where Ethernet Rx/Tx terminal mapping, 25-bit position structure, KR terminal sealing, INOX grounding, and F8A Ø16 mm recessed hollow-shaft fit must remain aligned with the installed PLC project. The failure boundary is not only the 10–30 VDC supply, but also device identity, 100 MBit/s PROFINET communication, binary position structure, Rx-/Tx-/Rx+/Tx+ polarity, shield continuity, hollow-shaft clamping, and explosion-proof certificate scope. Typical production lead time: 15 working days.
This model is used where the controller reads absolute multiturn position over a PROFINET network from a recessed hollow-shaft encoder with a radial KR terminal compartment. A compatible replacement must preserve the 13-bit singleturn and 12-bit multiturn position structure, binary code behavior, Ethernet terminal assignment, PLC project recognition, Ø16 mm shaft interface, stainless housing boundary, and hazardous-area installation requirement.
System Limits
The first system boundary is the PROFINET project and 25-bit position structure. ESM78E-F8AKRREBI-1213 must appear to the PLC as the correct PROFINET encoder device with matching device identity, network configuration, position data length, counting direction, diagnostic behavior, and binary position expectation. If the replacement is supplied with a different interface profile, wrong position structure, changed direction behavior, or incompatible device identity, the network may still detect an Ethernet device while the axis reports the wrong position, unstable diagnostics, incorrect travel direction, or commissioning mismatch.
The second boundary is the KR terminal compartment and F8A hollow-shaft installation. Terminal 1 GND, terminal 2 +Ub, terminal 5 Rx-, terminal 6 Tx-, terminal 7 Rx+, terminal 8 Tx+, grounding terminal, shield path, cable gland, stopping plug, and stainless housing bonding must match the installed wiring. A correct PROFINET encoder can still fail if Rx/Tx pairs are crossed, polarity is reversed, unused terminals are treated as active signals, the shield is terminated with high impedance, or the KR sealing boundary is not preserved. Mechanically, the Ø16 mm × 40 mm recessed hollow shaft, clamping ring, axial seating, radial runout, torque reaction, and shaft-load boundary must be checked together.
Wiring & Installation
Before replacement, confirm the full installed model code, PROFINET device identity requirement, PLC project configuration, 13-bit singleturn and 12-bit multiturn structure, counting direction, diagnostic mapping, KR terminal layout, radial cable-entry direction, cable-gland condition, stopping-plug condition, INOX housing requirement, and F8A hollow-shaft dimension. The “E” code position requires confirmation against the installed version before production, because the available type table identifies the standard PROFINET option differently.
During installation, verify supply wiring, GND, Rx-/Tx-/Rx+/Tx+ terminal assignment, grounding terminal, shield continuity, and Ethernet cable routing before powering the system. Keep PROFINET wiring away from motor and drive cables, avoid cable kinking or tensile load at the gland, and maintain low-impedance bonding through the terminal compartment. The hollow shaft must be fully seated before the clamping ring is tightened, and the machine shaft should not force the encoder body off center. Explosion-proof suitability must be confirmed against the installed hazardous-area requirement and certificate scope before shipment.
Custom Compatible Solution
- Match PROFINET communication behavior, 13-bit singleturn plus 12-bit multiturn feedback, binary code, and PLC project expectations
- Preserve GND, +Ub, Rx-, Tx-, Rx+, Tx+, grounding terminal, shield continuity, KR cable-gland sealing, and stopping-plug boundary
- Adapt the F8A Ø16 mm × 40 mm recessed hollow shaft, KR radial terminal compartment, INOX stainless housing, and IP66 sealing boundary
- Review device identity, Ethernet terminal mapping, hollow-shaft clamping, shaft runout, housing bonding, hazardous-area certificate scope, and commissioning requirements before shipment
Key Data
| Item | Data |
|---|---|
| Model | ESM78E-F8AKRREBI-1213 |
| Encoder type | Explosion-proof multiturn absolute rotary encoder |
| Interface | PROFINET |
| Transmission rate | 100 MBit/s |
| Supply voltage | 10–30 VDC |
| Output code | Binary |
| Singleturn resolution | 13 bit |
| Multiturn resolution | 12 bit |
| Total position structure | 25-bit absolute multiturn data |
| Connection | KR, terminal compartment with 1 cable gland and 1 stopping plug |
| Cable exit | R, radial |
| Ethernet terminal boundary | Rx-, Tx-, Rx+, Tx+ mapping requires confirmation before replacement |
| Shaft / flange | F8A recessed hollow shaft, Ø16 mm × 40 mm |
| Housing material | I, INOX stainless steel |
| Code item requiring confirmation | E requires confirmation against installed version |
| Protection class | IP66 sealing boundary requires confirmation against installed version |
| Hazardous-area boundary | ATEX / IECEx explosion-proof compliance requires confirmation against installed certificate scope |
| Key replacement checks | Device identity, PLC project match, position data length, Rx/Tx terminal mapping, shield continuity, KR sealing, INOX grounding, F8A hollow-shaft clamping |
