The reference ground for all inputs is the 0 V power contact, the outputs are fed via the 24 V power contact. The conductors can be connected without tools in the case of solid wires using a direct plug-in technique.
The HD Bus Terminals (High Density) with increased packing density feature 16 connection points in the housing of a 12 mm terminal block.

| Technical data | KL1859 |
|---|---|
| Connection technology | 1-wire |
| Specification | EN 61131-2, type 1/3 |
| Number of channels | 8 inputs + 8 outputs |
| Nominal voltage | 24 V DC (-15 %/+20 %) |
| “0“ signal voltage | -3…+5 V (EN 61131-2, type 1/3) |
| “1“ signal voltage | 11…30 V (EN 61131-2, type 3) |
| Input filter | typ. 3.0 ms |
| Input current | typ. 3 mA (EN 61131-2, type 3) |
| Load type | ohmic, inductive, lamp load |
| Max. output current | 0.5 A (per channel) |
| Reverse voltage protection | yes |
| Current consumpt. K-bus | typ. 25 mA |
| Current consumption power contacts | typ. 15 mA + load |
| Electrical isolation | 500 V (K-bus/field potential) |
| Bit width in the process image | 8 inputs + 8 outputs |
| Configuration | no address or configuration setting |
| Conductor types | solid wire, stranded wire and ferrule |
| Conductor connection | solid wire conductors: direct plug-in technique; stranded wire conductors and ferrules: spring actuation by screwdriver |
| Rated cross-section | solid wire: 0.08…1.5 mm²; stranded wire: 0.25…1.5 mm²; ferrule: 0.14…0.75 mm² |
| Weight | approx. 60 g |
| Operating/storage temperature | 0…+55 °C/-25…+85 °C |
| Relative humidity | 95 %, no condensation |
| Vibration/shock resistance | conforms to EN 60068-2-6/EN 60068-2-27/29 |
| EMC immunity/emission | conforms to EN 61000-6-2/EN 61000-6-4 |
| Protect. class/installation pos. | IP 20/variable (see documentation) |
| Approvals | CE, UL, Ex |
