Siemens 6AV2123-2GB03-0AX0 Retrofit-Ready HMI for KTP700 Basic Control Systems
The Siemens 6AV2123-2GB03-0AX0 is a 7-inch SIMATIC KTP700 Basic HMI panel engineered for seamless integration into existing SIMATIC S7-1200 and S7-1500 control architectures. As legacy HMI panels reach end-of-life or become unavailable through standard distribution channels, the 6AV2123-2GB03-0AX0 serves as a verified retrofit-ready replacement that preserves existing TIA Portal project structures, PROFINET communication links, and operator screen layouts with minimal re-engineering effort.
This unit is sourced from authorized supply chains, undergoes pre-shipment functional testing, and is backed by a 12-month warranty. It is stocked and available for immediate dispatch to support urgent production line recovery, planned system upgrades, and scheduled maintenance windows.
Upgrade Compatibility Table
| Parameter | 6AV2123-2GB03-0AX0 (KTP700 Basic) | Retrofit Notes |
|---|---|---|
| Display Size | 7″ Widescreen TFT | Same panel cutout as predecessor KTP700 models |
| Resolution | 800 × 480 px | Compatible with existing WinCC Basic screen projects |
| Communication Interface | PROFINET (RJ45 × 1) | Direct replacement for PROFINET-based HMI nodes |
| Configuration Software | TIA Portal V13 SP1 and above | Existing HMI projects can be migrated without full redesign |
| Power Supply | 24 V DC (±20%) | Verify existing 24 V DC rail capacity before installation |
| Mounting | Panel cutout 214 × 158 mm | Fits standard KTP700 cutout; no mechanical modification required |
| Operating Temperature | 0 °C to +50 °C | Confirm cabinet ventilation meets thermal requirements |
| Replacement Compatibility | Replaces 6AV6647-0AB11-3AX0 (OP77B) with adaptation | Screen layout and tag mapping require review in TIA Portal |
| Commissioning Tool | TIA Portal + PC Adapter USB / PROFINET | No dedicated programming cable required for PROFINET download |
| Warranty | 12 Months — covers hardware defects, display, and communication port | |
Retrofit Planning for Existing Automation Systems
Replacing an HMI panel in a live production environment requires careful pre-migration planning to avoid extended downtime and configuration loss. When integrating the 6AV2123-2GB03-0AX0 into an existing control cabinet, engineers should begin by auditing the current 24 V DC power supply capacity — particularly when the cabinet also powers a SIMATIC S7-1200 CPU 1214C or a distributed I/O node such as the ET 200SP with multiple I/O modules. Shared 24 V rails must be verified to handle the additional 4.5 W draw of the KTP700 Basic without triggering overcurrent protection on the SITOP PSU100S 24 V/5 A or equivalent power supply unit.
Terminal wiring for the HMI power connector follows the standard 2-pin 24 V DC arrangement. If the existing cabinet uses a SIMATIC S7-300 or older S7-400 rack with a CP 343-1 or CP 443-1 PROFINET communication processor, the network topology must be reviewed to confirm that the HMI’s PROFINET port can be assigned a valid IP address within the existing subnet. In multi-device PROFINET rings using SCALANCE X208 managed switches, the new HMI node should be added to the network configuration in TIA Portal before physical installation to prevent address conflicts.
For systems migrating from older Siemens panels such as the TP177B or OP177B — which used MPI or PROFIBUS DP communication — a protocol migration step is required. The 6AV2123-2GB03-0AX0 is PROFINET-only and does not support MPI or PROFIBUS natively. In these cases, a SIMATIC S7-1200 SM 1278 4xIO-Link Master or a protocol gateway may be required to bridge legacy field devices while the HMI communicates over PROFINET. Tag variable mapping must be re-established in TIA Portal, and all HMI screen objects referencing legacy PLC data blocks should be validated against the updated tag table before commissioning.
Backplane and rack considerations apply when the HMI is part of a larger panel upgrade that also involves replacing a SIMATIC S7-300 rack UR2 with a modern S7-1500 rack and CPU 1516-3 PN/DP. In such scenarios, the I/O module addresses, program organization blocks (OBs), and function blocks (FBs) must be remapped. The HMI project in TIA Portal should be updated in parallel to reflect the new PLC symbol table, ensuring that all process values, alarm triggers, and recipe data remain correctly linked after the rack swap.
Downtime Control During System Migration
Minimizing production downtime during HMI replacement is a primary concern for plant engineers. The recommended approach for replacing the 6AV2123-2GB03-0AX0 in a running system is to prepare the replacement unit fully offline before the scheduled maintenance window. This includes loading the TIA Portal HMI project onto the new panel via PROFINET download, verifying all screen navigation paths, confirming alarm group assignments, and testing recipe data transfer — all in a bench environment before the panel reaches the production floor.
During the physical swap, the existing PROFINET cable can be disconnected from the old panel and connected directly to the new unit without changes to the network switch configuration, provided the IP address and device name have been pre-assigned in TIA Portal. The SIMATIC S7-1200 or S7-1500 PLC continues to execute its control program uninterrupted during the HMI swap, as the PLC does not depend on the HMI for scan cycle execution. Field I/O, including digital input modules such as the SM 1221 DI 16×24VDC and analog output modules such as the SM 1232 AQ 4×14BIT, remain active throughout the panel replacement.
After physical installation, a brief online test should confirm PROFINET communication status (green link LED), HMI project version match, and correct display of all process values. The total planned downtime for a prepared HMI swap of this type is typically under 30 minutes when the replacement unit has been pre-commissioned and tested.
Retrofit Support FAQ
Q1: Is the 6AV2123-2GB03-0AX0 a direct drop-in replacement for the earlier KTP700 Basic PN 6AV2123-2GB03-0AX0 units?
Yes. The 6AV2123-2GB03-0AX0 maintains the same panel cutout dimensions (214 × 158 mm), 24 V DC power input, and PROFINET interface as earlier production batches. Existing TIA Portal HMI projects compiled for KTP700 Basic are fully compatible and can be downloaded to the replacement unit without modification.
Q2: Can this HMI be used to replace a panel that communicated via MPI or PROFIBUS DP?
The 6AV2123-2GB03-0AX0 supports PROFINET only. If your existing system uses MPI or PROFIBUS DP, a protocol migration plan is required. This typically involves upgrading the PLC communication interface or adding a protocol converter. Our technical team can advise on the appropriate migration path for your specific control platform.
Q3: What pre-shipment testing is performed on each unit?
Each 6AV2123-2GB03-0AX0 unit undergoes power-on functional testing, display uniformity verification, PROFINET port communication check, and touchscreen calibration validation before dispatch. Units are shipped with original packaging and include a test report. All units are covered by a 12-month warranty against hardware defects.
Q4: How do I verify wiring compatibility before installation?
Confirm that your existing 24 V DC supply can deliver at least 0.25 A continuous to the HMI panel. The power connector is a standard 2-pin terminal block. PROFINET connection uses a standard RJ45 patch cable. No special programming cable is required — project download is performed over PROFINET using TIA Portal. Terminal block pinout and installation dimensions are available in the Siemens SIMATIC HMI KTP700 Basic operating instructions (document A5E02479740).
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