Application Scenarios
Picture a bottling line where twenty pneumatic actuators cycle continuously, each returning a position feedback signal to confirm cap placement and fill valve closure. When one feedback signal flickers due to electrical noise from adjacent VFD cables, the PLC misinterprets the actuator as still moving and halts the entire line, costing production minutes per shift. The WAGO 750-401 addresses this by integrating a 0.2 ms RC filter on each input channel, rejecting transient interference while preserving the timing resolution needed for high-speed sequencing. In another scenario—a packaging machine with dozens of limit switches routed through a shared control cabinet—the module’s compact 12 mm width allows engineers to populate dense I/O racks without expanding panel footprint, and its CAGE CLAMP® spring terminals reduce wiring time per connection compared to screw-type alternatives.
Parameter
| Parameter | Value / Description |
|---|---|
| Product Model | WAGO 750-401 |
| Manufacturer | WAGO |
| Product Category | Digital Input Module |
| Number of Inputs | 2 channels |
| Input Voltage | 24 V DC (field supply) |
| Signal Voltage (0) | −3 V … +5 V DC |
| Signal Voltage (1) | +15 V … +30 V DC |
| Input Filter | 0.2 ms RC noise rejection |
| Input Current | 4.5 mA per channel (typical) |
| Isolation | 500 V system / field |
| Connection Technology | CAGE CLAMP® (0.08–2.5 mm² / AWG 28–14) |
| Mounting | DIN-35 rail |
| Protection Class | IP20 |
| Dimensions (W × H × D) | 12 × 100 × 69.8 mm |
| Weight | Approx. 45.8 g |
| Operating Temperature | 0 … +55 °C |
Technical Principles and Innovative Values
Innovation Point 1 – High-Side Switching for Sourcing Sensor Compatibility: The WAGO 750-401 employs positive-switching inputs, meaning a 24 V potential applied to the input terminal sets that channel’s signal state to “high”. This design aligns with the most common industrial sensor output topology—PNP sourcing sensors—eliminating the need for additional interface relays or signal inverters when connecting standard inductive proximity switches.
Innovation Point 2 – Galvanic Isolation at 500 V: The module maintains 500 V electrical separation between the field wiring and the internal system bus. This isolation barrier prevents ground potential differences between distant sensor locations and the control cabinet from degrading signal integrity, and it also protects downstream controller electronics from field-side voltage transients.
Innovation Point 3 – Passive Power Jumper Contacts: Rather than requiring individual power wiring for each module, the WAGO 750-401 receives its 24 V field supply and 0 V reference through blade-and-spring power jumper contacts that snap together when modules are placed adjacent on the DIN rail. This eliminates daisy-chain wiring errors and reduces installation time in multi-module bus nodes.
Innovation Point 4 – Dual Filter Options Within the Same Form Factor: WAGO offers the 750-400 (3.0 ms filter) and the WAGO 750-401 (0.2 ms filter) in identical physical packages. Engineers can select the filter speed that matches their application—0.2 ms for high-speed position feedback and 3.0 ms for noisy contact inputs—without changing panel layout or wiring plans.
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