I. Model Status: Unofficial Model
1. No Standard/Safety/Custom Records:
Beckhoff's KL29xx (TwinSAFE Safety Output) series only officially releases the KL2904 (4-channel 24V DC, 0.5A, Cat.4/PL e/SIL3); there are no datasheets, order numbers, or CE/UL certifications for the KL2908 (8-channel Safety Output); "KL2908" on the market is mostly a typo for KL2808 (standard 8-channel output) or KL2904, a non-original modification, or a counterfeit.
2. No Special Customization Number:
Beckhoff special terminals will have a 4-digit extension number added to the standard model (e.g., KLxxx-00xx); there is no independent KL2908 basic model.
II. Easily Confusing Official Models (Accurate Alternatives)
1. KL2808 (8-channel general digital output, non-safety, standard supply)
Parameters
| Parameters |
Specifications |
| Number of Channels |
8 channels |
|
24V DC |
| Single Channel Current |
0.5A (short circuit protection) |
| Rated Voltage |
24V DC (-15%~+20%, 20.4~28.8V) |
| Isolation |
K-Bus / Field Side 500V |
| Dimensions / Weight |
12*100*68 mm, approx. 60g |
| Temperature |
0~+55°C, IP20 |
| Certifications |
CE, UL, ATEX |
2. KL2904 (4-channel TwinSAFE safety output, standard safety model)
- Function: Fail-safe output, data transmission via TwinSAFE/Safety over EtherCAT;
- Safety Class: EN ISO 13849-1 Cat.4/PL e, IEC 61508 SIL3;
- Single channel 0.5A, 24V DC, K-Bus isolation 500V;
- Applicable to: emergency stop, safety door, protective locking, and other safety circuits.
3. Official solution for 8-channel safety output (correct selection when KL2908 is unavailable)
- Cascade two KL2904s to make 8 channels;
- EtherCAT terminal block EL2918 (8-channel safety output, EtherCAT side, non-K-Bus);
- EtherCAT Box EP2918 (IP67 optional, distributed installation).
