ABB CL-LSR.C12DC2 Logic Relay (1SVR440711R0300): Specifications Guide

Small machines and standalone panels often need a controller that is smaller and simpler than a full PLC, yet more capable than a bundle of timing and interposing relays. The ABB CL-LSR.C12DC2 (order number 1SVR440711R0300) is a compact logic relay built for exactly that role: a 24 V DC device with eight digital inputs, four relay outputs, a front LCD, and a keypad for on-device programming. This deep guide covers its verified specifications, terminal wiring, programming workflow, built-in functions, and typical applications so maintenance and procurement teams can specify and replace it with confidence.

What Is the CL-LSR.C12DC2?

The CL-LSR.C12DC2 belongs to ABB's CL range of logic relays, which are designed to replace conventional logic wiring for small and medium control tasks. The "CL-LSR" line is the entry-level compact logic relay; the "C" prefix indicates the version with a display and keypad, and "C12DC2" identifies the 24 V DC rated variant. You build the program as simple contact-and-coil rungs either on the front panel or from a PC, and the module performs logic, timing, counting, and time-switch functions without additional hardware.

Verified Specifications

Onboard I/O and Wiring

The module provides eight digital inputs and four relay outputs on screw terminals mounted on the front of the DIN-rail housing. The relay outputs offer electrical isolation from the input side, which makes them well suited to switching contactors, solenoid valves, indicator lamps, and small motors directly. Each output circuit should be fused or protected with a B16 circuit breaker or an 8 A slow-acting fuse as recommended in the data sheet.

Two inputs (I7, I8) double as analog inputs, letting the module read simple 0–10 V style signals without a separate analog expansion. Inputs I1–I6 share the common logic supply and are not individually isolated; the published "0" and "1" thresholds define clean switch detection for conventional 24 V proximity switches and contacts. Cable runs up to roughly 40 m are typical for I1–I6, with longer runs possible on I7/I8.

Programming

There are two ways to build the circuit. The fastest path for small changes is the front display and keypad: you navigate rung by rung, add normally open or normally closed contacts and a coil, and the power-flow display animates live logic so you can verify the circuit while the machine runs. For larger programs, documentation, and simulation, the CL-SOFT software (CL-LAS.PS002) runs on a PC, where the same rung diagram is drawn, stored, simulated, and then downloaded to the device. This makes it practical to keep a documented copy of each machine program for spares replacement.

Built-In Functions

Beyond basic contact-and-coil logic, the CL-LSR.C12DC2 includes the functions most small sequential machines need:

• Multifunction timing relays for on-delay, off-delay, pulse, and flashing modes
• Counts and operating-hours measurement for maintenance awareness
• Week and year time switches for schedule-driven equipment
• Freely editable display texts so technicians see plain-language messages on the front LCD

Typical Applications

• Pump, fan, and compressor sequencing with duty or anti-cycle logic
• Conveyor, gate, and small packaging-machine interlocks
• Lighting and HVAC control in building-services panels
• Stand-alone machines that previously used arrays of timers and relays

Related controllers are listed in our ABB range and the broader PLC collection.

Expansion and Accessories

When four outputs are not enough, a CL-LER.2O output expansion module adds two relay outputs. Larger I/O requirements can be met by stepping up to the CL-LMR or CL-LER master units with twelve inputs and six relay outputs, and remote or higher-level display variants (CL-LDC) add a full graphic backlit display and CL-NET networking. Data plugs and the CL-LAD mounting tool support bench programming and display-module service.

Lifecycle and Spare Parts

The CL range has been in service for many years, so installed CL-LSR units are regularly replaced during maintenance. When swapping a failed module, match the exact order number 1SVR440711R0300 to preserve the 24 V DC supply, eight-input/four-relay-output configuration, and display/keypad feature set. Units that are no longer in current production can often be sourced through our Discontinued Products range; send the part number and we will confirm availability and any compatible alternatives.

Frequently Asked Questions

What supply voltage does the CL-LSR.C12DC2 use?

This variant is rated at 24 V DC, with an operational range of 20.4–28.8 V DC and a tolerance of -15% to +20%. Other CL-LSR variants are available for 12 V DC, 24 V AC, and 100–240 V AC.

How many inputs and outputs does it have?

It has eight digital inputs, of which I7 and I8 can be used as analog inputs, plus four relay outputs. A CL-LER.2O expansion adds two more relay outputs when needed.

Can it be programmed from a PC?

Yes. In addition to the front keypad and LCD, the CL-SOFT (CL-LAS.PS002) PC software lets you draw, simulate, store, and download rung diagrams for documentation and larger programs.

Does it include Ethernet?

The standalone CL-LSR.C12DC2 does not include an onboard Ethernet port. CL-NET networking is available on the higher CL display-system variants if a networked solution is required.

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