The Beckhoff KL1904 4-channel digital input safety Bus Terminal
The Beckhoff KL1904 is a high-performance, fail-safe digital input terminal engineered for decentralized automation networks. This 4-channel module enables the direct connection of safety sensors—such as emergency stop buttons, safety switches, and light curtains—using reliable 2-wire technology. By integrating advanced diagnosis mechanisms, it continuously monitors for cross-circuits and sensor faults to ensure uninterrupted operations. It transmits secure data via the standard K-bus using TwinSAFE protocol communication, allowing users to fulfill the most stringent safety regulations without separate, complex safety wiring.
| Specifications | |
| Product Make | BECKHOFF |
| Model Number | KL1904 |
| Number of Inputs | 4 fail-safe digital inputs |
| Connection Technology | 2-wire |
| Nominal Voltage | 24 V DC (-15% / +20%) |
| Current Consumption (K-bus) | Typically 48 mA |
| Current Consumption (Power Contacts) | Typically 4 mA + load |
| Response Time | Typically 4 ms (read input / write to K-bus) |
| Protocol | TwinSAFE / Safety over EtherCAT (FSoE) |
| Isolation | 500 V (K-bus/signal voltage) |
| Condition | NEW |
| Warranty | 1 YEAR |
| Country of Origin | Germany |
| Protection Degree | IP20 |
| Length | 68 mm |
| Width | 12 mm |
| Height | 100 mm |
| Weight | 50 g |









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