Core Functionality and Application
The Siemens U-55N input module connects field sensors and switching devices to industrial control systems. This module handles discrete signals from pushbuttons, limit switches, and proximity sensors reliably. It supports both AC and DC input voltages for broad application compatibility. Additionally, the module offers electrical isolation between the field wiring and the backplane bus.
Technical Specifications
The following table details the core technical parameters for the Siemens U-55N:
| Parameter | Specification |
|---|---|
| Model Number | U-55N |
| Product Type | Discrete Input Module |
| Number of Inputs | Typically 4 or 8 channels (dependent on configuration) |
| Input Voltage | AC/DC (specific range depends on variant) |
| Nominal Voltage | 24 VDC or 110/220 VAC (verify by marking) |
| Isolation | Galvanic isolation between inputs and bus |
| Indicators | LED status display for each channel |
| Dimensions | Standard Siemens modular form factor |
| Weight | Approx. 0.3 – 0.5 kg (0.66 – 1.10 lbs) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Mounting | DIN-rail or panel mount |
Design and Integration Features
The Siemens U-55N features a compact modular design that simplifies installation in control cabinets. Its screw-type terminal blocks provide secure connections for field wiring. LED indicators on the front panel display the status of each input channel clearly. The module also offers replaceable fuses for input circuit protection. Users can install this module in standard Siemens racks or on DIN rails.
System Compatibility
The Siemens U-55N works with various Siemens PLC systems, including S5 and early S7 platforms. It connects to the backplane bus for high-speed data exchange with the CPU. Integrators can combine this input module with compatible output modules for complete I/O solutions. For accurate wiring details, users should consult the specific product label or manual.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 217 mm |
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