6ES5456-4UA12 Siemens S5 456 AC DO Module – 16 Output 2A 115/230V, Short-Circuit Proof per Group, Compact U Series

Product Overview

The 6ES5456-4UA12​ is a medium-power digital output module within Siemens’ SIMATIC S5 PLC ecosystem, engineered to switch 16 galvanically isolated AC load circuits at 115 V or 230 V AC (47–63 Hz) with a rated 2 A per channel under ventilated conditions. Marketed under Siemens’ “Compact design U” branding for the 456 series, this module occupies a 40 mm × 255 mm × 195 mm envelope in the S5 rack and targets S5-115U, S5-135U, and S5-155U central and expansion racks where AC actuator control—contactors, solenoid valves, beacon stacks, motor-starter coils—must be driven directly from the PLC without intermediate interposing relays. Although the 456 family name suggests continuity with the narrow 20 mm Compact U digital input modules (e.g., the 432 series), the 6ES5456-4UA12​ uses a 40 mm-wide mechanical profile to accommodate the AC switching elements, per-group fusing, and the higher thermal envelope (39 W rated power dissipation versus ~7.5 W on the DC input counterpart).The 6ES5456-4UA12​ organizes its 16 outputs into two electrically isolated groups of eight, each group supplied via a separate L (line) feed and protected by a 6.3 A fast-blow fuse covering four consecutive outputs within the group. This 4-output sub-group fusing strategy means that a shorted load knocks out at most four channels rather than the entire 8-channel group—an important nuance for plants where partial degradation is preferable to full bay failure. Inter-group isolation is specified at 2000 V AC per VDE 0160, with group-to-backplane-ground isolation at 1500 V AC, ensuring the AC-switched side remains well-separated from the 5 V DC system bus that powers the module’s logic section (100 mA typical draw from the S5 backplane).Siemens placed the 6ES5456-4UA12​ into PLM PM490 (start of final year of support) effective October 1, 2020, with the product deleted without replacement—meaning no S5-native successor exists and asset owners must rely on verified spare stock, refurbishment channels, or S7-modernization migration. For the substantial installed base of S5-135U/155U systems still running in water treatment, bulk material handling, extrusion lines, and power-plant auxiliary controls, the 6ES5456-4UA12​ remains a strategically stocked spare due to its unique combination of 16 AC outputs, per-4-channel fusing, and group-level diagnostics via the F+/F- enable input.

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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.

Contact Us WhatsApp / Wechat：+86 18150087953
Phone：+86 18150087953
Email：sales@cxplcmro.com

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