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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5458-4UA12 |
| Manufacturer | Siemens |
| Product Type | Digital Output Module (Relay Contact) |
| Series | SIMATIC S5 458 |
| Compatible Controllers | S5-135U, S5-155U |
| Number of Outputs | 16 (floating relay contacts) |
| Rated Supply Voltage L+ | 24 V DC |
| Supply Voltage Range | 20 to 30 V DC |
| Contact Configuration | 8 SPDT relays, each driving 2 outputs |
| Contact Rating (with RC module) | 60 V DC / 48 V AC, 0.5 A (resistive) |
| Contact Rating (without RC module) | 60 V DC / 48 V AC, 70 mA |
| Inductive Load Current (with RC) | 0.5 A max. |
| Inductive Load Current (without RC) | 0.1 A max. |
| Lamp Load Current | 0.5 A max. |
| Fuse Protection | 16 x 1 A slow-blow (coil protection only) |
| Contact Mechanical Life | 10⁸ operating cycles |
| Enable Input Voltage Range | 13 to 33 V DC |
| Enable Input Logic “1” | -33 to 5 V DC |
| Enable Input Current | 5 mA typical |
| Current Consumption (L+/L-) | 200 mA typical |
| Current Consumption (5V Bus) | 80 mA typical |
| Power Dissipation | 5.2 W |
| Switching Frequency (resistive) | 100 Hz max. (1 ms pickup/dropout) |
| Switching Frequency (up to 50 mA) | 10 Hz max. |
| Switching Frequency (up to 0.3 A) | 2 Hz max. |
| Switching Frequency (up to 0.5 A) | 0.5 Hz max. |
| Coincidence Factor | 100% |
| Cable Length (unshielded) | 400 m max. |
| Isolation Test Voltage | 500 V AC (between groups, to ground) |
| Dimensions (W x H x D) | 20 x 255 x 195 mm |
| Weight | Approx. 0.45 kg |
| Operating Temperature | 0 to +60 °C |
| Protection Class | IP20 |
| Certifications | CE, UL |
Main Features and Advantages
Floating Relay Contact Outputs: The Siemens 6ES5458-4UA12 provides 16 floating dry contact outputs that are electrically isolated from the PLC’s internal logic circuitry. This floating design allows the module to interface with loads that operate at different voltage levels or require separate grounding configurations without introducing ground loops or signal interference. Unlike transistor outputs that are tied to a common reference, the relay contacts of the 6ES5458-4UA12 provide true galvanic isolation between the control system and each output channel.
Versatile Load Switching Capability: The 6ES5458-4UA12 supports switching of resistive, inductive, and lamp loads, with contact ratings up to 0.5 A at 60 V DC or 48 V AC when using the optional RC element module. The module’s versatility extends to AC and DC load types, making the Siemens 6ES5458-4UA12 suitable for applications that require switching of different signal types within a single module. For inductive loads, the use of external suppressor circuits is recommended to extend contact life and reduce electrical interference.
Enable Input for Coordinated Control: The 6ES5458-4UA12 incorporates an enable input (F+/F-) that allows external conditions to de-energize all relay coils simultaneously. This feature enables coordinated shutdown in emergency situations, simplifies implementation of safety interlock circuits, and allows the Siemens 6ES5458-4UA12 to be disabled during system startup sequences or maintenance operations without affecting other modules.
Compact Form Factor and Dense I/O: Packing 16 output channels into a single narrow 20 mm slot, the 6ES5458-4UA12 offers high I/O density for space-constrained control cabinets. The compact design of the Siemens 6ES5458-4UA12 allows efficient utilization of rack slots while maintaining adequate cooling through natural convection. The module’s weight of approximately 0.45 kg contributes to mechanical stability in vibration-prone installations.
Optional RC Protection Module: The Siemens 6ES5458-4UA12 supports an optional external RC element module that provides contact protection for switching of inductive and resistive loads. When fitted, the RC module extends contact life and reduces EMI by suppressing arcing and transients at the relay contacts. This option allows users to configure the 6ES5458-4UA12 for optimized switching performance based on the specific load characteristics of their application.
Diagnostic LED Indicators: Status LEDs on the front faceplate of the Siemens 6ES5458-4UA12 provide real-time visual confirmation of output channel states, simplifying troubleshooting and system verification. During commissioning and maintenance, the LEDs allow operators to quickly verify signal states without requiring external test equipment or software diagnostics.
