WAGO 750-421 2-Channel Digital Input Module (24V DC, Diagnostics)
The WAGO 750-421 is a high-performance 2-channel digital input module designed for the WAGO I/O System 750 and 753. This slim, DIN-rail mountable module acts as an interface between your PLC/fieldbus controller and field devices, receiving 24V DC binary signals from sensors, switches, and proximity controls. Engineered with advanced short-circuit diagnostics, the 750-421 actively monitors your sensor power lines. If a short circuit to the ground occurs, the module automatically isolates the fault, transmits an error message to the fieldbus controller, and resets itself once the error is cleared—preventing system downtime and protecting your automation hardware.
| Specifications | |
| Product Make | WAGO |
| Model Number | 750-421 |
| Number of Digital Inputs | 2 Channels |
| Signal Type | 24 VDC |
| Signal Voltage (0) | -3 VDC to +5 VDC |
| Signal Voltage (1) | 15 VDC to 30 VDC |
| Input Filter (Delay) | 3.0 ms |
| Input Current (Typ.) | 7 mA |
| Sensor Diagnostics | Short circuit to ground (reported via fieldbus) |
| Connection Technology | CAGE CLAMP® (8 x Terminals) |
| Mounting Type | DIN-35 Rail |
| Condition | NEW |
| Warranty | 1 YEAR |
| Country of Origin | Germany |
| Protection Degree | IP20 |
| Depth | 69.8 mm |
| Width | 12 mm |
| Height | 100 mm |
| Weight | 62 g |










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