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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5456-4UA12 |
| Manufacturer | Siemens (SIMATIC S5 series) |
| Product Type | Digital Output Module, Compact design U (AC) |
| Number of Outputs | 16 (galvanically isolated, 2 groups × 8) |
| Rated Supply Voltage (L) | 115 to 230 V AC (47 to 63 Hz) |
| Supply Voltage Range | 88 to 264 V AC |
| Output Type | AC semiconductor switching (triac-based, short-circuit protective) |
| Output Voltage (Logic 1) | L – max. 1.5 V (voltage drop) |
| Residual Current at Logic 0 | ≤ 5 mA |
| Switching Current (resistive / inductive) | 40 mA to 2 A (ventilated); 40 mA to 1 A (unventilated) |
| Max. Switching Current per 4 Outputs | 2.5 A (ventilated); 2.5 A fused at 6.3 A fast-blow per 4 ch |
| Lamp Load (incandescent) | 40 mA to 2 A (ventilated); 40 mA to 1 A (unventilated) |
| Max. Inrush Current Allowed | 25 A/group (≤ 3 ms), 15 A/group (≤ 20 ms), 13 A/group (≤ 50 ms) |
| Fusing | 6.3 A fast-blow, 1 fuse per 4 outputs |
| Enable Input (F+/F-) | Present, for group-level enable/diagnostic |
| Voltage Test (VDE 0160) | 2000 V AC between groups; 1500 V AC group-to-ground |
| Permissible Unshielded Line Length | 300 m max. |
| System Bus Power (Digital Section) | 5 V DC, 100 mA typical |
| Power Dissipation (Rated Operation) | 39.0 W |
| Dimensions (W × H × D) | 40 mm × 255 mm × 195 mm |
| Weight | Approx. 0.7 kg (0.743 kg per Siemens mall listing) |
| Compatible Contactors (reference) | Siemens 3TB40–3TB58 (230 V AC), 3TJxx–3TB54 (115 V AC) |
Main Features and Advantages
16-point AC output in a single S5 slot: Where DC output modules (e.g., the 6ES5454 series) handle 24 V DC loads, the 6ES5456-4UA12 fills the AC-actuation niche—driving 115 V or 230 V AC contactor coils, solenoid valves, acoustic horns, tower lights, and motor-starter control circuits directly from the S5 rack without external interposing relays. At 2 A per channel (ventilated rating) and a wide 88–264 V AC supply tolerance, a single 6ES5456-4UA12 can manage, for example, eight 230 V contactor coils plus eight 115 V solenoid valves in one rack slot, with each group fed from a separately fused L supply.Four-output sub-group fusing with 6.3 A fast-blow: A standout protection feature of the 6ES5456-4UA12 is the fuse-per-four-outputs arrangement. Sixteen outputs → two groups of eight → each eight subdivided into two four-channel sub-groups, each protected by its own 6.3 A fast-blow fuse. This granular fusing means a shorted beacon or welded contactor coil takes down at most four consecutive outputs within one group, leaving the other 12 outputs live. By contrast, many generic AC output modules fuse at the group level (8 outputs gone for one fault). The 6ES5456-4UA12 thus offers finer fault containment—critical in processes where losing all 16 outputs simultaneously could trigger a full line shutdown.Short-circuit-protective output stages with group acknowledge: Each output channel on the 6ES5456-4UA12 is semiconductor-switched (triac-based) and designed to survive a short-circuit event on the load side until the corresponding 6.3 A fuse clears. After a fault-clear and fuse replacement, the module requires a group-level acknowledge (via the F+/F- enable cycling or PLC-side logic) to resume normal operation—preventing silent re-energization into a potentially still-defective field circuit. The F+/F- enable input also allows the PLC program to disable all 8 outputs of a group en masse for safe maintenance or EMO response, a feature frequently mapped to the cell’s emergency-stop ladder rung in S5-135U/155U programs.High inrush tolerance for reactive AC loads: The 6ES5456-4UA12 specifies three inrush tiers—25 A/group for ≤ 3 ms, 15 A/group for ≤ 20 ms, and 13 A/group for ≤ 50 ms—making it suitable for driving contactor coils and solenoid valves that exhibit high inrush (pick) current before settling to holding current. Siemens’ reference table in the S5 manual (C79000-B8576-C199-03) cross-lists compatible contactor sizes: 3TB40 through 3TB58 at 230 V AC, and 3TJxx through 3TB54 at 115 V AC, giving panel builders a pre-validated Bill-of-Materials path. The 6ES5456-4UA12 thus isn’t just a generic AC DO—it’s specifically qualified against Siemens’ own low-voltage switching accessories.Thermal derating clarity (ventilated vs. unventilated): The datasheet explicitly differentiates 2 A/channel (ventilated cabinet) versus 1 A/channel (unventilated/sealed enclosure) for both resistive/inductive and lamp loads. At 39 W total module dissipation, the 6ES5456-4UA12 runs noticeably warmer than DC I/O siblings, so Siemens’ ventilation caveat matters in practice. In S5 cabinets where the 6ES5456-4UA12 sits between a PS955 power supply and a 432 DI module, respecting the 1 A derating in unventilated enclosures prevents nuisance thermal trips—something field engineers discover the hard way if they assume “2 A everywhere.”Robust AC isolation per VDE 0160: 2000 V AC inter-group and 1500 V AC group-to-ground isolation ratings place the 6ES5456-4UA12 well above typical PLC I/O isolation minimums, a necessity when the switched side carries 230 V AC mains-derived voltage in the same rack as 5 V DC logic. For retrofit jobs where the S5 rack shares a cabinet with 400 V drive infrastructure, this isolation margin protects both the S5 CPU and the field personnel during troubleshooting.Legacy sourcing reality: With PM490 status and deletion without replacement (October 2020), the 6ES5456-4UA12 is now a pure spare-part play. For S5-115U/135U/155U asset owners, the procurement strategy shifts from “order from Siemens” to “qualify a verified-refurbished supplier who bench-tests all 16 channels at 115 V and 230 V, validates fuse clearance, and checks F+/F- group enable.” The module’s 300 m max. unshielded cable length (per EN 61131-2 AC DO guidance) also remains unchanged regardless of sourcing path—field wiring done right in 1998 is still right today.
