TQ EM 420-LLRR Modular Energy Automation Module, 4 Digital Inputs, 4 Relay Outputs, 2x Ethernet, RS485, DIN Rail, 24V DC 3063550100

In a mid-sized manufacturing plant, the facility manager needs to monitor energy consumption across multiple production lines and automatically shed non-critical loads during peak tariff periods. The TQ EM 420-LLRR sits on the DIN rail inside the main control cabinet, wired to pulse-output utility meters and current sensors. Its four digital inputs count pulses and capture status signals, while the four relay outputs switch contactors for lighting and HVAC zones. Two Ethernet ports daisy-chain to other modules and connect to the plant's PROFINET network, and the RS485 port polls legacy Modbus RTU meters. The integrated web server lets the manager view real-time power data and configure alarm thresholds from any browser, without extra software.

Key specifications

• 4 digital inputs for pulse counters, status signals, or dry contacts
• 4 potential-free relay outputs, max 250V AC / 30V DC, 5A per contact
• 2x RJ45 Ethernet ports with integrated switch (Modbus TCP, PROFINET, OPC UA, HTTP, FTP, SNTP)
• 1x RS485 serial port with Modbus RTU support
• Supply voltage 24V DC (18–30V DC), power consumption < 5 W
• DIN rail mounting per EN 60715, IP20 protection, plastic housing
• Operating temperature -20°C to +60°C, storage -40°C to +85°C
• Real-time clock with battery backup, data logger, and alarm management
• Configuration via web interface or TQ software tool
• CE certified; part of the modular TQ EM 420 series

Why choose it

The EM 420-LLRR combines energy data acquisition and load control in one compact module, reducing wiring and cabinet space. Its dual Ethernet ports allow line topology without additional switches, and the built-in web server eliminates the need for dedicated SCADA software for basic monitoring. The real-time clock and data logger ensure that energy profiles are time-stamped even during network outages, and the battery backup preserves clock settings. With support for both modern Ethernet protocols and legacy RS485, it integrates into new and existing automation systems alike.

Ideal use cases

• Energy monitoring and sub-metering in industrial facilities
• Load shedding and peak demand management
• Building automation for lighting, HVAC, and pump control
• Industrial IoT edge data collection and forwarding
• Retrofit projects where existing Modbus RTU meters must be integrated

Good to know

The module is part of the TQ EM 420 series, allowing you to expand I/O count by adding more modules on the same DIN rail. Configuration is straightforward: connect to the module's web interface, set IP parameters, map inputs to outputs, and define alarm rules. The relay outputs are potential-free, so they can switch both AC and DC loads up to the specified ratings. For installations in harsh environments, note the IP20 rating requires a protective enclosure. The CE mark confirms compliance with relevant EU directives for industrial automation equipment.