Logic relays and small PLC-style controllers are often mounted deep inside panels where no one can see the status LEDs, let alone change a set point or step through a small program. The ABB CL-LDD.K (order number 1SVR440839R4400) is ABB's companion display-and-keypad accessory for the CL range of compact logic modules: a backlit graphic screen with a membrane keypad that plugs onto the front of a CL logic module to give operators a local view and an editing terminal. This guide covers the verified specifications, what the screen shows, how it mounts and connects, and which CL modules it pairs with, so panel builders and maintenance teams can specify or replace the right accessory. SHLY-PLC supplies ABB CL-range parts as an independent industrial-automation distributor; every unit is inspected and tested before dispatch.
What Is the CL-LDD.K?
The CL-LDD.K is not a standalone controller. It is an external operator interface module designed to attach to ABB CL-series compact logic modules (the CL-L / CL series of logic relays and small PLCs). It adds a backlit graphic display and a full keypad so that installers can configure the logic module, monitor input and output states, adjust timing and counter values, and see diagnostic messages without a PC connected to the module.
In a typical panel, the CL logic module sits on a DIN rail and the CL-LDD.K mounts on the door or on the module itself, connected by the dedicated plug-in link. That arrangement gives machine operators a local HMI for small standalone machines, pumps, conveyors, and building-services sequences without the cost of a full touch-panel HMI.
Key Specifications
| Parameter | Specification |
|---|---|
| Product name | CL-LDD.K display module with keypad |
| Order number | 1SVR440839R4400 |
| Brand range | ABB Logic relays and Display system CL range |
| Display type | Backlit graphic LCD |
| Display resolution | 132 x 64 pixels |
| Keypad | Integrated membrane keypad with navigation and function keys |
| Mounting | Front panel / module-attached |
| Weight | Approx. 0.13 kg |
| Compatible host | ABB CL-series logic modules (CL-L range) |
| Function | Local status display, parameter setting, and program editing |
What the Screen Shows and How It Is Operated
The 132 x 64 pixel backlit screen is large enough to show several lines of text and simple graphics. When attached to a CL logic module it is used to:
- Display the operational state of the logic module and the on/off status of digital inputs and outputs
- Show timer, counter, and analog values, and allow them to be adjusted locally
- Step through the small ladder or function-block program and force I/O during commissioning
- Display diagnostic and fault messages to speed up troubleshooting on the machine
- Set the module's basic configuration parameters without a PC
The membrane keypad provides the navigation keys, numeric entry, and function keys needed to move between menus, edit values, and confirm changes. Because the display is backlit, it remains readable in dim corners of a machine or in a utilities room where a plain LED status row would be hard to interpret.
Mounting and Connection
The CL-LDD.K connects directly to the CL logic module through the dedicated accessory interface on the front of the module; it does not require a separate field power supply or its own wiring run. In practice, the installer clips or screws the display onto the module or onto the panel door, plugs the link into the matching port, and the display powers from the logic module. No additional configuration is needed to bring up the basic status view; deeper editing functions are reached through the keypad menu. When replacing a failed display on an existing CL installation, the swap is mechanical plus the plug-in connector, and the original logic program is retained in the host module.
Note that the CL-LDD.K is a display/keypad accessory and must be used with a compatible CL logic module; it cannot drive field devices on its own and does not add I/O to the system.
Typical Applications
- Standalone machines and skids using a CL logic module as the main controller
- Pump, fan, and compressor control with local set-point adjustment
- Conveyors and small packaging machines needing on-board status feedback
- Building-services and lighting/heating sequences mounted in accessible panels
- Retrofit where a small local display is added to an existing CL logic module
For these duties the CL-LDD.K turns a hidden DIN-rail logic module into an operable local control point. Related ABB logic and control products can be browsed in our ABB range and the broader PLC collection.
Lifecycle and Spare Parts
The ABB CL range is a mature compact logic family. As machines age, the display-and-keypad assembly is often the first part to wear out because of repeated key presses and panel-door movement, while the underlying logic module keeps running. Keeping a known-good CL-LDD.K on hand for critical CL-based machines avoids a call-out just to read a timer value. SHLY-PLC sources tested CL-range accessories; for discontinued or hard-to-find CL parts, see our Discontinued Products range, or send us the order number and we will confirm availability and compatible alternatives.
Frequently Asked Questions
What does the ABB CL-LDD.K do?
It is a backlit graphic display with an integrated keypad that attaches to an ABB CL-series logic module, providing local status viewing, parameter setting, and small-program editing without a PC.
What is the display resolution of the CL-LDD.K?
It uses a backlit graphic LCD with a resolution of 132 x 64 pixels, large enough for multi-line text, simple graphics, and timer/counter values.
Does the CL-LDD.K need its own power supply?
No. It connects directly to the CL logic module over the dedicated accessory interface and takes its power from the host module; no separate field wiring or supply is required.
Can the CL-LDD.K be used as a stand-alone controller?
No. It is an operator-interface accessory only. It must be paired with a compatible ABB CL-series logic module, which supplies the I/O and the control program.
SHLY-PLC is an independent distributor of industrial automation parts. All brand names, model numbers, and trademarks are the property of their respective holders and are used only for identification and compatibility reference.