Siemens 6AV2123-2GB03-0AX0 KTP700 Basic Replacement for SIMATIC HMI

Product Overview

Siemens 6AV2123-2GB03-0AX0 KTP700 Basic: Seamless Replacement & Upgrade for SIMATIC HMI Legacy Systems

The Siemens 6AV2123-2GB03-0AX0 KTP700 Basic is a 7-inch multi-touch HMI operator panel from the SIMATIC HMI Basic Panel 2nd Generation family. Engineered for integration with Siemens SIMATIC S7-1200 and S7-1500 PLCs via PROFINET, this panel delivers a reliable, cost-effective human-machine interface for machine-level visualization in industrial automation environments. At TOPNLMS, we supply this unit as a direct replacement or upgrade solution for aging and discontinued HMI panels, helping engineering teams minimize downtime and preserve existing control system architectures during modernization projects.

Many facilities currently operating older SIMATIC HMI panels — including the KTP600 Basic PN (6AV2123-2DB03-0AX0), the TP177B, or the OP177B — face increasing pressure as spare parts become scarce and firmware support ends. The 6AV2123-2GB03-0AX0 provides a forward-compatible migration path. Its PROFINET interface aligns with the communication infrastructure already in place on most S7-1200 and S7-1500 control networks, eliminating the need for protocol converters or gateway modules in the majority of retrofit scenarios.

When migrating from a KTP600 Basic PN or an earlier TP177 panel, engineers will find that the physical footprint of the KTP700 Basic requires a panel cutout adjustment from 192 × 138 mm to 214 × 158 mm. The mounting depth and 24 VDC power supply wiring remain directly compatible — no additional power conditioning or signal isolation modules are required in standard installations. The rear-side cable layout mirrors the wiring scheme used across the KTP400 Basic, KTP900 Basic, and KTP1200 Basic product lines, simplifying multi-panel cabinet installations.

From a programming perspective, projects originally developed in WinCC flexible Compact or WinCC flexible Standard can be migrated to TIA Portal WinCC Basic using Siemens’ built-in migration wizard. Screen layouts, tag mappings, and alarm configurations transfer with minimal manual rework. For sites already running TIA Portal V15.1 or later, the 6AV2123-2GB03-0AX0 is natively supported without additional software licensing. The panel communicates with the S7-1200 CPU — such as the 6ES7214-1AG40-0XB0 CPU 1214C — or S7-1500 CPU modules over standard PROFINET IO, using the same SCALANCE X series network switch infrastructure already installed in the control cabinet.

For systems that previously relied on MPI or PROFIBUS DP communication — common in older S7-300 or S7-400 architectures — a communication module or protocol bridge may be required. In these cases, an IE/PB Link PN IO gateway can maintain connectivity without replacing the entire PLC platform. Alternatively, this migration is often the trigger point for a broader controller upgrade to the S7-1500 series, at which point the 6AV2123-2GB03-0AX0 integrates natively over PROFINET without any additional hardware.

Control cabinet space is a frequent concern during HMI retrofits. The KTP700 Basic’s slim profile and front-mount design make it suitable for most standard enclosures. The panel’s IP65-rated front face ensures continued protection against dust and water ingress in harsh industrial environments. During commissioning, the panel’s integrated web server and TIA Portal device configuration tools allow rapid IP address assignment and tag binding. Engineers familiar with the SIMATIC HMI ecosystem will find the startup sequence identical to other Basic Panel 2nd Generation devices. Backup and restore operations are supported via USB, enabling fast panel swaps in the field without a laptop connection to the engineering station.

For facilities managing a mixed fleet of HMI devices — including older OP73, TP177A, or MP277 panels — the 6AV2123-2GB03-0AX0 can be standardized as the replacement unit across multiple machine lines, reducing spare parts inventory complexity. Its compatibility with the SM 1223 digital I/O modules and CM 1241 RS422/485 communication modules in the S7-1200 ecosystem means it fits naturally into distributed I/O architectures without additional configuration overhead.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete migration to the 6AV2123-2GB03-0AX0 typically involves more than just the HMI panel itself. In most retrofit projects, the S7-1200 CPU module — such as the 6ES7214-1AG40-0XB0 CPU 1214C DC/DC/DC — serves as the primary controller, communicating with the KTP700 Basic over PROFINET. Where the existing network infrastructure requires expansion, a SCALANCE X005 or X208 managed switch provides the necessary port density without introducing latency on the control network.

For sites transitioning from PROFIBUS-based architectures, the CM 1243-5 PROFIBUS master module for the S7-1200 allows the new HMI to coexist with legacy field devices during a phased migration, protecting investments in existing PROFIBUS I/O stations and drives. On the I/O side, SM 1221 digital input modules and SM 1222 digital output modules integrate directly into the S7-1200 signal board rack, preserving existing field wiring while the HMI layer is upgraded. For analog signal handling, the SM 1231 analog input module supports 4–20 mA and 0–10 V signals from legacy transmitters without rewiring.

In control cabinets where signal isolation is required — particularly when replacing older TP177B panels connected to third-party PLCs or mixed-vendor drive systems — a signal isolator module can be inserted inline without modifying the HMI configuration or the PROFINET addressing scheme. For power distribution within the cabinet, a SITOP PSU100S 24 VDC power supply module provides stable, regulated power to both the KTP700 Basic panel and the S7-1200 CPU simultaneously, simplifying the cabinet power architecture during the retrofit.

Programming cable requirements are minimal: TIA Portal communicates with the S7-1200 directly over Ethernet using a standard RJ45 patch cable, eliminating the need for the PC Adapter USB A2 or MPI/DP programming cables previously required for S7-300 and S7-400 systems. The KTP700 Basic itself is configured entirely through TIA Portal’s HMI device wizard, with no separate panel configuration utility required — a significant reduction in engineering time compared to WinCC flexible-based workflows.

Retrofit Guidance FAQ

Q: Can the 6AV2123-2GB03-0AX0 replace a KTP600 Basic PN without modifying the control program?
A: The HMI project must be migrated from WinCC flexible to TIA Portal WinCC Basic. The migration wizard handles most tag and screen conversions automatically, but manual review of alarm configurations and recipe management screens is recommended before going live.

Q: Is PROFIBUS DP communication supported on this panel?
A: No. The KTP700 Basic supports PROFINET only. For PROFIBUS-based systems, an IE/PB Link PN IO gateway or a controller upgrade to S7-1200/1500 is required before connecting this panel to the network.

Q: Does the panel cutout need to be modified when replacing a KTP600?
A: Yes. The KTP700 Basic requires a cutout of 214 × 158 mm versus the KTP600’s 192 × 138 mm. Panel door modification is necessary, but mounting hardware and 24 VDC wiring remain compatible.

Q: What TIA Portal version is required for commissioning?
A: TIA Portal V14 SP1 or later is required. V16 or V17 is recommended for full feature support, firmware update capability, and access to the latest HMI function blocks.

Q: Can the panel be swapped in the field without an engineering laptop?
A: Yes. Using the USB backup/restore function, a pre-configured panel image can be loaded onto a replacement unit in the field without TIA Portal access, minimizing downtime during emergency replacements.

Q: Is the 6AV2123-2GB03-0AX0 compatible with S7-300 PLCs directly?
A: Not natively. The KTP700 Basic communicates via PROFINET. S7-300 systems with a CP 343-1 PROFINET communication processor can connect, but a full migration to S7-1200 or S7-1500 is the recommended long-term path for system stability and support continuity.

Warranty Assurance

Every 6AV2123-2GB03-0AX0 unit supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each unit undergoes functional verification including power-on testing, display inspection, touch calibration check, and PROFINET port continuity verification. Units that do not meet our quality standards are quarantined and not shipped.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund, with return shipping coordinated by our after-sales team. Our typical response time for warranty claims is within 1 business day. We maintain buffer stock of high-demand SIMATIC HMI models to ensure rapid replacement dispatch, minimizing production downtime for our customers.

For urgent procurement requirements, expedited shipping via DHL Express, FedEx International Priority, or UPS Worldwide Express is available from our Xiamen warehouse. Standard lead time for in-stock units is 1–3 business days to most destinations. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared for all international shipments.

For volume orders, OEM procurement, or project-based supply agreements, please contact our technical sales team directly to discuss pricing, lead times, and consignment stocking arrangements.