VISOLUX SLVA‑4K – Compact PLC Module for Flexible Automation

The VISOLUX SLVA-4K is a compact programmable logic controller module manufactured by Elektronik GmbH, designed to provide reliable and cost-effective control solutions for small to medium-scale automation systems. With its integrated power supply, digital I/O, and communication interfaces, this PLC offers a self-contained platform that simplifies machine control and process monitoring.

Hardware Architecture

The SLVA-4K features a microcontroller-based architecture with 32-bit processing capability. It includes 8 digital inputs (24 V DC) and 6 digital outputs (relay or transistor type), along with 2 analog input channels (0‑10 V or 4‑20 mA) and 1 analog output. The module is housed in a rugged plastic enclosure with DIN-rail mounting, occupying minimal panel space. LED indicators on the front panel provide real-time status of power, run, and I/O states.

Programming and Logic Capabilities

Programming is accomplished using VISOLUX's proprietary software environment, which supports ladder logic, function block diagrams, and structured text. The CPU offers a program memory of 16 KB, sufficient for most standard control sequences, and 2 KB of retentive data memory. A real-time clock is built-in for time-stamped events and scheduled tasks, enhancing the module's versatility in batch processing and time-based control.

Communication and Networking

The SLVA-4K is equipped with one RS-485 port supporting Modbus RTU protocol, enabling communication with HMIs, drives, and remote I/O units. An optional Ethernet module can be added for integration into TCP/IP networks, allowing remote monitoring and data exchange via OPC or custom protocols. The module also supports a simple peer-to-peer link for master-slave configurations.

Environmental and Power Specifications

Operating temperature range is -10 °C to +55 °C with humidity tolerance of 5% to 95% non-condensing. The unit accepts a wide input voltage of 24 V DC ±20%, with built-in reverse polarity and overvoltage protection. Power consumption is typically less than 5 W, making it energy-efficient for continuous operation.

Application Fields

Typical uses include conveyor control, automated lighting, packaging machines, small pumping stations, and educational training systems. Its simple architecture and ease of programming make it an excellent choice for OEM applications where cost and space are critical factors.

Certifications and Quality

The VISOLUX SLVA-4K complies with CE and RoHS directives, and is built to ISO 9001 quality standards. The module undergoes rigorous functional testing to ensure reliability in industrial environments.

Overall, the SLVA-4K from Elektronik GmbH delivers a practical and durable PLC solution for a wide range of control tasks, providing both performance and value.