Siemens 6AV2124-2DC01-0AX0 KTP400 Comfort Touch Panel
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Product Information
The Siemens 6AV2124-2DC01-0AX0 is a compact human-machine interface from the SIMATIC HMI Comfort Panels family, designated as the KTP400 Comfort. Built for industrial operator control and process visualization, this panel features a 4.3-inch widescreen TFT display with 480 x 272 resolution and rendering for 16 million colors. Operator control combines a touch screen with four physical membrane function keys labeled F1 through F4. Powered by a 24 V DC supply operating within a 19.2 to 28.8 V DC range, the unit consumes 3.1 W with a rated current of 0.13 A, and includes a backlight rated for an 80,000-hour MTBF.
Network integration for the 6AV2124-2DC01-0AX0 includes an integrated PROFINET RJ45 interface supporting 10/100 Mbit/s, alongside a 9-pin Sub-D serial interface for MPI and PROFIBUS DP up to 12 Mbit/s. Additional peripheral interfaces consist of a USB 2.0 Type A host port and a USB 2.0 Mini-B device port. Application engineering is performed in SIMATIC WinCC Comfort within TIA Portal V11 or higher, utilizing 4 MB of internal user memory. During maintenance, a replacement unit can be commissioned without an external PC by using an active SIMATIC HMI SD memory card to restore project parameters, runtime configurations, and system firmware. ABC Industrial Parts provides technical support for preparing replacement hardware and configuring field communication.
System diagnostic feedback is accessed through on-screen alarm windows, internal Control Panel diagnostic menus, and online connection via SIMATIC ProSave or TIA Portal. Hardware status feedback is provided by the F1 through F4 function key LEDs, which illuminate solid red on system boot or self-test failure to signal initialization errors. Network disconnects reported under code 100001 warrant physical cable, supply power, or baud rate verification, whereas code 200000 points to operating system or runtime faults. Internal board or flash memory corruption that persists after an OS update is non-serviceable in the field, making replacement with a tested spare unit from ABC Industrial Parts the most reliable restoration method.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6AV2124-2DC01-0AX0 |
| Model / Type | KTP400 Comfort |
| Product Family | SIMATIC HMI Comfort Panels |
| Component Type | HMI Panel |
| Display Size | 4.3 in |
| Display Resolution | 480 x 272 pixels |
| Display Colors | 16777216 |
| Supply Voltage | 24 V DC |
| Supply Voltage Range | 19.2 - 28.8 V DC |
| Rated Current | 0.13 A |
| Power Consumption | 3.1 W |
| User Program Memory | 4 MB |
| Backlight MTBF | 80000 h |
| PROFINET Interface | 1 x RJ45 (10/100 Mbit/s) |
| Serial Interface | 1 x Sub-D 9-pin (MPI / PROFIBUS DP up to 12 Mbit/s) |
| USB Ports | 1 x USB 2.0 Host (Type A), 1 x USB 2.0 Device (Mini-B) |
Programming and Configuration
The Siemens 6AV2124-2DC01-0AX0 requires configuration using SIMATIC WinCC Comfort, WinCC Advanced, or WinCC Professional integrated within TIA Portal V11 or higher. The panel provides 4 MB of internal user memory to accommodate graphical screens, recipe structures, and alarm logging archives.
An onboard SIMATIC HMI SD memory card slot supports automated system backup routines. When configured, project files, network settings, and operating system images are continuously synced to the memory card, allowing replacement hardware to be restored on-site without an engineering workstation or direct TIA Portal connection.
Communication and System Integration
The KTP400 Comfort panel supports multi-vendor architecture and fieldbus connectivity. Physical interfaces include one RJ45 port for 10/100 Mbit/s PROFINET communication and one 9-pin Sub-D connector for MPI or PROFIBUS DP connections up to 12 Mbit/s. USB 2.0 Host (Type A) and Device (Mini-B) connections allow integration of external keyboards, barcode scanners, or memory drives.
Native drivers enable direct integration with Siemens SIMATIC S7-1200, S7-1500, S7-300, and S7-400 PLCs. In addition, communication drivers are built in for non-Siemens controllers using Modbus TCP, Modbus RTU, and Allen-Bradley EtherNet/IP protocols.
Diagnostics and Status Indication
System diagnostic monitoring is handled locally and over network connections. Local diagnostics include system alarm buffers, user message windows, and diagnostic screens accessible via the panel Control Panel. External diagnostic functions can be executed using SIMATIC ProSave software or TIA Portal Online Diagnostics.
The physical function keys F1 through F4 feature embedded status LEDs. During system initialization, solid red illumination indicates boot progress or hardware self-test failure, providing direct visual feedback on operational state.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| F1 - F4 Function Key LEDs | Red / Programmable - Solid Red on boot/failure | Programmable status indication or hardware key feedback. Solid red on boot or self-test failure indicates hardware/system initialization fault. |
Replacement and Spare Part Considerations
When replacing a failed 6AV2124-2DC01-0AX0 unit, verify that the replacement hardware matches the part number and that communication settings on the panel match the original PLC parameters. Software options added to the WinCC runtime require license key transfers using Automation License Manager or SIMATIC ProSave.
If an automatic system backup is maintained on a SIMATIC HMI SD memory card, insert the card into the replacement unit to automatically restore the runtime configuration, project data, and matching operating system image without external programming tools.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| 100000 | Connection established | Communication link to the configured controller was established successfully. | Normal operation, network initialized. | None (Informational message). |
| 100001 | Connection disconnected | Communication link to the controller was interrupted. | Disconnected network cable, powered-down controller, incorrect network configuration, or baud rate mismatch. | Check physical cable connection, check PLC power status, verify IP/MPI/PROFIBUS address settings in Control Panel. |
| 110001 | Tag read error | Panel failed to read one or more configured tags from the PLC. | PLC variable out of bounds, DB non-existent or not accessible, mismatched PLC firmware/addressing. | Check PLC data blocks and symbols, verify PLC program is loaded and running. |
| 140001 | License error | A required software license or option key is missing on the panel runtime. | Unlicensed option configured in the WinCC project (e.g. Audit, OPC UA server option). | Transfer required license key using Automation License Manager / ProSave. |
| 200000 | System error | Internal operating system or runtime error occurred. | Corrupted runtime configuration, memory allocation failure, or hardware flash corruption. | Perform OS update / factory reset using SIMATIC ProSave. If error persists after OS restore, return unit for repair. |
Frequently Asked Questions
Which software is needed to program the Siemens 6AV2124-2DC01-0AX0 HMI?
The KTP400 Comfort is configured using SIMATIC WinCC Comfort, WinCC Advanced, or WinCC Professional inside TIA Portal V11 or higher.
Can I replace a Siemens 6AV2124-2DC01-0AX0 without using an engineering PC?
Yes. If an active SIMATIC HMI SD memory card was installed in the original panel, inserting it into the spare unit allows automatic transfer of the project, runtime configuration, and operating system without connecting a PC.
What controllers can connect to the 6AV2124-2DC01-0AX0 panel?
The panel natively connects to Siemens SIMATIC S7-1200, S7-1500, S7-300, and S7-400 PLCs over PROFINET or MPI/PROFIBUS DP. It also supports third-party PLCs using Modbus TCP, Modbus RTU, and Allen-Bradley EtherNet/IP.
What does a solid red light on the F1-F4 function keys indicate?
A solid red light on boot or during self-test indicates a hardware or system initialization fault.
How do you clear fault code 100001 (Connection disconnected)?
Check physical network cable connections, ensure the connected PLC is powered on, and verify that the IP, MPI, or PROFIBUS address settings in the panel's Control Panel match the network configuration.
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Data backup and recovery
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Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
We are not an authorised distributor of Siemens.
Product photos are for illustration purposes only and may differ from the actual product delivered.
Some of the content on this page was created with the help of AI. While we strive to provide accurate and up-to-date information, errors may occur.