Lovato LRD12RD024 Micro PLC Base Module, 24 V DC, 12 I/O

Lovato LRD12RD024 micro PLC base module, 24 V DC, 12 I/O

The Lovato LRD12RD024 is a compact logic controller base module with 24 V DC supply, 6 digital inputs, 2 inputs usable as digital or analog, 4 relay outputs and a 4-line LCD. It is the standard, non-Ethernet counterpart of the LRK12RD024 and can be extended to 36 I/O with LRE expansion modules. Seven Star LLC supplies the LRD12RD024 in Oman and the GCC as an independent supplier in Muscat.

LRD is the series, 12 the I/O count, R the relay outputs, D the DC supply and 024 the 24 V level. The data sheet lists no communications port on this base module, so check the manual and catalogue for programming accessories before ordering.

LRD12RD024 technical specifications

How the LRD12RD024 differs from the LRK12RD024

The two modules share housing, I/O count and relay outputs but differ in important details. The LRD12RD024 needs a regulated 24 V DC with a 20.4 to 28.8 V window, draws 125 mA and has an input threshold of 15 V DC, whereas the LRK12RD024 runs from 12 or 24 V, draws 300 mA and switches at 10 V DC. The analog conversion is 10-bit on the LRD against 12-bit on the LRK, and the LRD allows +55 °C operation against +50 °C. Choose by supply, resolution and communication needs.

Programming languages and scan times

The data sheet quotes a sampling time of 5 to 20 ms for ladder programs and 2 to 10 ms for function block diagrams, which indicates both languages are supported. These times are fine for pump sequences, timers and level control, but not for fast motion control.

Where the LRD12RD024 fits

Typical tasks are start-stop logic, alternation of two pumps, sequencing of compressors, light and ventilation control, and alarm annunciation. Pair it with a PSL1M06024 power supply, which delivers 24 V DC, 2.5 A, enough for the controller and its field devices. Output relays can drive Lovato BF contactors or relays like the HR301CA230 through the DIN rail.

LRD12RD024 selection and ordering checklist

• Count inputs and outputs, with spare
• Confirm regulated 24 V DC supply is available
• Check relay ratings against loads
• Decide whether Ethernet is needed; if so, consider the LRK12RD024
• Plan expansion modules
• Check +55 °C panel limit

Installation and commissioning of the LRD12RD024

Install in a clean cabinet on DIN rail, fit surge suppressors on coil loads and keep analog wires shielded. Load the program, test inputs from the display and force outputs with the motors disconnected. Keep a copy of the program with the cabinet drawings.

Typical LRD12RD024 applications in Oman and the GCC

Typical applications are packaged water booster sets, jockey and standby pump control, generator room ventilation, tank-filling control and small conveyors. In the Gulf climate the 20 to 90 percent humidity limit is rarely reached indoors, but condensation in outdoor panels is possible and the controller is not rated for it.

Worked example: duplex pump control on the LRD12RD024

A duplex sump station needs two pump inputs for overload trips, three level float inputs (low, high, high-high), and two outputs for the pump contactors plus one for an alarm. That is six inputs and three outputs, well within the 8 inputs and 4 outputs of this module. The program alternates the lead pump on every cycle, starts the second pump on the high float, forces both on at high-high and sets the alarm if a pump overload input is active. The four relay outputs drive the contactor coils directly if each coil draws less than the relay rating, and otherwise through interposing relays.

The two analog inputs can read a 0 to 10 V level transmitter, which allows an additional analogue setpoint for the same station. At 10-bit resolution the steps are about 10 mV, adequate for level but not for fine process control. A PSL1M06024 supply feeds the controller and the float switches.

Maintenance notes for the LRD12RD024

Inspect terminals annually, clear dust from the housing vents and verify that the supply stays inside the 20.4 to 28.8 V DC window, since a sagging 24 V rail is the most common cause of random resets. Back up the program after every change.

Information to send with an RFQ for the LRD12RD024

• Part number LRD12RD024 and quantity
• Input and output counts
• Supply available
• Communication needs
• Panel temperature
• Delivery location

Site conditions in Oman for the LRD12RD024

Control cabinets in Gulf plants often run hot, because many sit in outdoor kiosks or in rooms where air conditioning is not always reliable. Before you finalise the LRD12RD024, check the permitted ambient range and any derating stated by the manufacturer against the real temperature inside your panel, and leave the recommended spacing around the device so that heat can escape. Long cable runs between the field and the marshalling cabinet are common on large sites, so confirm the signal types, wiring limits and earthing arrangement early in the design.

It also helps to standardise on a small number of part numbers across a project. Keeping a few spare LRD12RD024 units on site in Oman shortens recovery time after a fault, and documenting configuration settings makes replacement faster for the maintenance team.

Documents and quotation

Send the part number LRD12RD024 and we will confirm the documents available for it, such as the technical data sheet, wiring diagram and instruction sheet, together with availability and lead time.

Seven Star LLC is an independent supplier in Muscat and is not an official channel of the manufacturer. Share the quantity, delivery location and project reference with the request and we will answer with a formal quotation.