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Description
Application ScenariosA cardboard corrugator line in Northern Italy, commissioned in 2001 on an S5-135U rack, uses three 6ES5430-4UA11 modules to read dry-contact signals from 96 discrete positions — splice detectors, web-break photocells, stack-height limit switches, and local E-stop strings — distributed along a 60-meter machine frame. The plant originally tried a non-isolated DI alternative during a 2015 “value engineering” parts swap, but stray currents from adjacent VFD-driven rollers kept tripping false “web break” inputs, forcing three unplanned stops in two months. Reverting to the 6ES5430-4UA11 (floating, 500 V AC isolation) eliminated the noise path — the four group-commons let the installer land three different 24 V sensor supplies without cross-talk. When Siemens eventually flagged the 430-4UA11 as discontinued, the maintenance manager quietly staged four spares; eighteen months later, a roof leak dripped onto one rack and a 6ES5430-4UA11 took the hit — swapped in ten minutes, no reprogramming, corrugator back online before the shift changed. On S5, “high-density floating” isn’t a spec-sheet luxury — it’s what keeps a 96-input machine on one rack instead of two.h2
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6ES5430-4UA11 |
| Manufacturer | Siemens (SIMATIC S5 Series) |
| Product Category | Digital Input Module, Floating (Galvanically Isolated) |
| Number of Inputs | 32 (Sinking / Negative Common) |
| Input Voltage | 20–30 V DC (nominal 24 V DC); “0” ≤ 5 V, “1” ≥ 15 V |
| Input Current (“1”) | 7 mA typ. @ 24 V DC per channel |
| Response Time | 4 ms typ. (input filter included) |
| Grouping / Isolation | 4 groups × 8 channels; 500 V AC field-to-logic isolation |
| Backplane Current | ~180 mA from 5 V DC backplane |
| Front Connector | 50-pin female (ribbon / pre-wired terminal block) |
| Dimensions (H×W×D) | ~250 × 50 × 210 mm (single-slot compact U) |
| Weight | ~0.46 kg |
| Compatible Racks | S5-115U, S5-135U (compact U version) |
h2 Technical Principles and Innovative Values
- Innovation Point 1: 32 floating inputs in a single U-slot. Most S5 floating DI modules cap at 8 or 16 channels per slot; the 6ES5430-4UA11 packs 32 isolated inputs into one compact “U”-version profile, split into four group-commons. That means you can land three different 24 V sensor supplies on one module without cross-grounding — a layout win on crowded S5-115U racks where slot count matters.
- Innovation Point 2: Sink-type with 15 V “1”-threshold and 4 ms integrated filtering. The 6ES5430-4UA11 requires ≥15 V DC to register an ON, rejecting the 12–13 V ripple that plagues long 24 V sensor runs near VFDs. The 4 ms input filter is baked into the optocoupler front-end, killing contact bounce on mechanical limit switches without any STEP 5 timer overhead.
- Innovation Point 3: 500 V AC field-to-logic isolation per group. Unlike the non-floating 6ES542x compact siblings, the 6ES5430-4UA11 galvanically separates each 8-channel group from the backplane and from each other via optocouplers. On S5-135U racks feeding from mixed-vendor sensor panels (some grounded, some floating), this prevents a miswired field loop from back-feeding noise onto the CPU bus — a failure mode that kills S5 CPUs silently.
