Siemens 6AV2123-2JB03-0AX0 — KTP900 Basic HMI Buying Guide

By Abdullah Zahid
12 min read
Siemens 6AV2123-2JB03-0AX0 SIMATIC HMI KTP900 Basic 9-inch touchscreen operator panel for S7-1200 machine control

Siemens 6AV2123-2JB03-0AX0 SIMATIC HMI KTP900 Basic Panel: Specifications, Compatibility, and Buying Guide

Controls engineers evaluating a 9-inch operator panel for an S7-1200 or S7-1500 system are typically deciding between the right-sized basic panel and spending more than the application demands. The Siemens 6AV2123-2JB03-0AX0 — the SIMATIC HMI KTP900 Basic — is a 9-inch widescreen touchscreen HMI that connects to SIMATIC S7 controllers over PROFINET, runs on 24V DC, and is configured entirely within STEP 7 Basic or STEP 7 Professional on the TIA Portal platform. At 800x480 pixel resolution with analog-resistive touch, it covers the core operator interface requirements for discrete and process automation without the cost of the Comfort Panel range.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the Siemens 6AV2123-2JB03-0AX0 — and Who Should Not

The SIMATIC HMI KTP900 Basic is the correct choice when your application matches all of the following criteria:

  • Your operator interface display requirement is specifically 9-inch widescreen format — not 7-inch, 10-inch, or 15-inch
  • Your control system is an S7-1200, S7-1500, or S7-200 PLC accessible over PROFINET Industrial Ethernet
  • Your engineering platform is STEP 7 Basic or STEP 7 Professional within TIA Portal V13 or later — WinCC flexible is not supported
  • Your panel enclosure supplies 24V DC between 19.2V and 28.8V
  • Your screen application fits within 10 MB of fixed user data memory — there are no expansion slots
  • Analog-resistive touch technology is acceptable — projected capacitive is not available on this model

If you need a 10-inch or 15-inch display, require projected capacitive touch, or need advanced features such as recipe management or integrated trending, the KTP1000 Basic or Siemens Comfort Panel range are the correct alternatives. If your PLC is an S7-300 or S7-400, this panel is not compatible — do not order it for those systems.

On this page:

What the SIMATIC HMI KTP900 Basic Actually Does in a Running System

The Siemens 6AV2123-2JB03-0AX0 is a local operator interface panel that gives machine operators and maintenance technicians a real-time window into the control system. In day-to-day operation it displays process values, active alarms, and status screens configured by the automation engineer in WinCC Basic. Operators use the analog-resistive touchscreen — which generates alphanumeric and numeric keyboards on-screen — to enter set points, acknowledge alarms, and navigate between display screens. None of that interaction requires the engineering workstation to be connected after commissioning; the panel runs its configured project independently from its fixed 10 MB of user data memory.

The product name from the manufacturer is SIMATIC HMI KTP900 Basic, and it belongs to the SIMATIC HMI product family. It is positioned as an entry-level basic panel — above simple text display units, but well below the Comfort Panel range in terms of feature set and price. The hardware real-time clock, backed by a battery capable of maintaining time for six weeks without power, provides accurate timestamp data for alarm logs and process records. At 5.5 watts typical active power consumption, it adds negligible thermal load inside compact panel enclosures.

Where the KTP900 Basic Sits in Your Control System Architecture

The 6AV2123-2JB03-0AX0 sits at the operator interface layer of the control hierarchy, receiving data from the PLC over PROFINET and presenting it to the operator. It is not a controller — it has no I/O and no independent execution logic. Its role is entirely visualization and parameter input.

  • Engineering workstation running TIA Portal with STEP 7 Basic or STEP 7 Professional creates the WinCC Basic project and downloads it to the panel
  • The S7-1200, S7-1500, or S7-200 PLC connects to the panel via a single PROFINET Industrial Ethernet cable (RJ45)
  • A managed or unmanaged industrial Ethernet switch may sit between the PLC and the panel depending on network topology
  • The KTP900 Basic panel displays process data sourced from PLC data blocks and accepts operator inputs that write values back to PLC memory
  • Field devices, sensors, and actuators connect to the PLC — not to the HMI panel, which has no field I/O ports

Typical Applications and Industries for the KTP900 Basic

In discrete manufacturing — injection molding, packaging lines, and assembly stations — the KTP900 Basic serves as the primary local operator interface for a single machine or station. An operator uses it to enter production batch parameters, monitor cycle counts, and acknowledge fault alarms without leaving the machine floor. The 9-inch widescreen format is large enough for clear alarm text and basic graphical status screens while fitting a standard panel door cutout of 251mm x 166mm.

In process automation applications such as mixing, bottling, and fluid handling, the panel provides real-time display of temperatures, flow rates, and valve status from the connected S7 controller. The NEMA Type 4 and Type 4x front enclosure rating means the panel face is protected against dust and splashing water, making it appropriate for wash-down adjacent areas where the panel door is sealed.

OEM machine builders and systems integrators frequently specify the KTP900 Basic as the standard operator panel in custom machinery because it integrates directly into the same TIA Portal project as the S7-1200 PLC — no separate HMI engineering tool license is required when using STEP 7 Basic. Retrofit and modernization projects on legacy machines also benefit from the standardized form factor and straightforward PROFINET commissioning process when replacing obsolete operator terminals.

Application Typical Deployment
Injection molding machine Single S7-1200 PLC with KTP900 Basic mounted on machine door for parameter entry and alarm display
Packaging line station Distributed operator panels at each station on a PROFINET network, each connected to a dedicated S7-1500 module
Bottling and filling process S7-1200 controlling filling valves; KTP900 Basic displaying fill volumes and cycle status to line operator
OEM control panel build Panel builder integrates KTP900 Basic and S7-1200 in same TIA Portal project; single engineering environment for PLC and HMI
Legacy machine retrofit Replacement of obsolete text-based terminal with KTP900 Basic; PROFINET connection to new S7-1200 retrofit controller
HVAC and utility automation Building automation control node with S7-1200 and KTP900 Basic for local setpoint adjustment and status monitoring

KTP900 Basic Key Specifications: What Engineers Need to Decide Fast

Parameter Value
Display Size 9-inch widescreen TFT LCD
Resolution 800 x 480 pixels (16-bit, 65,536 colors)
Touch Technology Analog-resistive
Backlight MTBF 20,000 hours at 25°C ambient
Supply Voltage 24V DC (19.2V to 28.8V permissible range)
Power Consumption (active) 5.5W typical, 230mA rated current
User Data Memory 10 MB fixed (non-expandable)
Interfaces 1x PROFINET Industrial Ethernet (RJ45), 1x USB (up to 16 GB)
Panel Dimensions (W x H x D) 267mm x 182mm x 39.4mm
Front Enclosure Rating NEMA Type 4 and Type 4x (IP20 rear)

Full technical specifications are available on the product page at LeadTime.ca.

KTP900 Basic vs. KTP700, KTP1000, and Comfort Panel: Which One Do You Actually Need?

Model Display Size Resolution Touch Type User Memory Key Differentiator
KTP700 Basic 7-inch 800 x 480 Analog-resistive 10 MB Lower cost, smaller footprint where 9-inch is not needed
6AV2123-2JB03-0AX0 (KTP900 Basic) 9-inch 800 x 480 Analog-resistive 10 MB Mid-size basic panel; best fit for standard machine door HMI requirement
KTP1000 Basic 10-inch 800 x 480 Analog-resistive 10 MB One inch larger for layouts requiring additional screen real estate
Comfort Panel (e.g., KTP1500) 15-inch Higher Projected capacitive available Larger Advanced features: recipes, trending, complex alarming; higher cost

If your application requires the 9-inch widescreen format with PROFINET connectivity and STEP 7 Basic integration, the 6AV2123-2JB03-0AX0 is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Verdict: Honest Assessment of the 6AV2123-2JB03-0AX0

The SIMATIC HMI KTP900 Basic earns its place in the automation market for one primary reason: it eliminates the engineering overhead that used to separate PLC and HMI development. Because WinCC Basic is integrated directly into the same TIA Portal project as the S7-1200 or S7-1500 program, an engineer working in STEP 7 Basic configures both controller logic and operator screens in a single environment. That means no separate HMI software license, no data linking between tools, and no duplicate tag management. For budget-constrained projects and OEM builds where the operator interface requirement is straightforward — alarm display, parameter entry, production status — this panel delivers exactly what is needed without paying for Comfort Panel capability that will never be used. The LED backlight MTBF of 20,000 hours at 25°C and the hardware real-time clock with six-week battery backup are practical features that support realistic production lifecycles.

The honest limitations are worth stating clearly. The fixed 10 MB user data memory cannot be expanded, so complex screen architectures with large graphical assets will hit that ceiling. The analog-resistive touchscreen performs well with a stylus or gloved hand but does not offer the multi-touch gestures or surface durability of projected capacitive technology. The panel has no wireless capability, no RS-232, no RS-485, and no MPI/PROFIBUS DP — PROFINET Ethernet is the only communication path, which means your network infrastructure must be ready before the panel arrives. And critically, this panel is incompatible with S7-300 and S7-400 PLC families — engineers migrating from older Siemens systems should verify PLC compatibility before committing to an order.

From a procurement standpoint, availability on this SKU varies by region and period. Lead times of two to four weeks are common through authorized distribution channels, with some periods extending further when demand on Siemens HMI components is elevated. Volume pricing structures are available for panel builders and OEMs ordering in quantity. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • Prepare a panel cutout of 251mm width x 166mm height; the panel supports both portrait and landscape mounting orientation with a maximum tilt angle of 35 degrees during operation
  • Connect 24V DC supply to the terminal block, verifying supply voltage falls within the 19.2V to 28.8V permissible range and that adequate current is available for the 230mA rated draw
  • Connect a PROFINET Industrial Ethernet cable via RJ45 from the panel's single Ethernet port to your PLC PROFINET port or industrial network switch — this is the only field communication interface on this panel
  • Verify grounding and shielding on the Ethernet cable follows industrial Ethernet practice to maintain signal integrity in electrically noisy environments
  • Apply 24V DC power and confirm that the two Ethernet status LEDs illuminate, indicating the panel has powered up and the PROFINET link is active

Initial Commissioning Overview

  • In TIA Portal, create a new project in STEP 7 Basic or STEP 7 Professional and add the KTP900 Basic device from the hardware catalog — this also adds the integrated WinCC Basic HMI environment to the project
  • Assign a PROFINET IP address to the panel within the TIA Portal network view and confirm it is on the same subnet as the target S7-1200, S7-1500, or S7-200 PLC
  • Build operator screens in WinCC Basic using the configured project tags linked to PLC data blocks; screen transfer to the panel is accomplished via the PROFINET Ethernet connection or via USB memory stick (up to 16 GB supported)
  • After download, verify touch response across all configured buttons and input fields, confirm alarm display behavior, and check that all screen navigation paths function correctly
  • Document the IP address assignment, project file version, and panel firmware version before handing over to production commissioning — the hardware real-time clock should be set to site local time during final commissioning

Wrong-Part Prevention: What Engineers Get Wrong When Ordering This HMI

Before placing an order for the Siemens 6AV2123-2JB03-0AX0, verify every item on this checklist. These are the most common sources of mismatched orders and project delays:

  1. Confirm PLC target system is S7-1200, S7-1500, or S7-200 (NOT S7-300/400)
  2. Verify PROFINET interface availability on control system (this panel requires PROFINET; does NOT have RS-232 or MPI/DP)
  3. Check 24V DC supply voltage rated between 19.2V-28.8V is available (does NOT accept AC or 120V)
  4. Confirm STEP 7 Basic / WinCC Basic V13 or later is your engineering software (NOT compatible with WinCC flexible 2008+)
  5. Verify portrait or landscape mounting orientation matches your application panel space (device supports both; confirm angle tolerance up to 35 degrees if tilted)
  6. Confirm 10 MB available user data memory is sufficient for application logic and screen storage (no expansion slots; fixed memory)
  7. Verify no requirement for RS-485 or serial interfaces (this model has PROFINET Ethernet and USB only)

If any item on this checklist cannot be confirmed, contact the LeadTime.ca team before ordering to identify the correct alternative — reach the LeadTime.ca team here or review full compatibility data on the product page.

Frequently Asked Questions

Can the Siemens 6AV2123-2JB03-0AX0 connect to an S7-300 or S7-400 PLC?

No. The SIMATIC HMI KTP900 Basic supports S7-1200, S7-1500, and S7-200 PLC systems via PROFINET. It is not compatible with the S7-300 or S7-400 families. Engineers migrating from S7-300/400 platforms to S7-1500 can then integrate the KTP900 Basic, but the older controllers are not supported directly.

Does the KTP900 Basic require a separate WinCC license to configure?

No. WinCC Basic is integrated into STEP 7 Basic and STEP 7 Professional within the TIA Portal environment. When you add the KTP900 Basic device to a TIA Portal project, the WinCC Basic HMI engineering tool is already included. WinCC flexible Compact and WinCC flexible Standard are not supported and cannot be used to configure this panel.

What is the mounting cutout size for the 6AV2123-2JB03-0AX0?

The required mounting cutout is 251mm wide by 166mm tall. The overall panel dimensions are 267mm wide, 182mm tall, and 39.4mm deep. Both portrait and landscape mounting orientations are supported, and the panel can be operated at a tilt angle of up to 35 degrees.

How long does the LED backlight last, and is it field-replaceable?

The LED backlight has an MTBF of 20,000 hours at 25°C ambient temperature — approximately 2.3 years of continuous operation. The datasheet does not list the backlight as a field-serviceable component, meaning display backlight degradation over time should be factored into planned maintenance intervals and panel replacement planning.

Can I transfer projects to the KTP900 Basic without an Ethernet connection?

Yes. In addition to PROFINET Ethernet as the primary project transfer method, the panel's USB port supports transfer via a standard USB memory stick (up to 16 GB), a SIMATIC HMI USB stick, or a SIMATIC IPC USB Flashdrive. This is useful during initial commissioning or in situations where network access to the panel is not yet established.

Is the KTP900 Basic available for shipment outside North America?

Yes. The Siemens 6AV2123-2JB03-0AX0 carries CE, cULus, and RCM certifications, supporting deployment in international markets. LeadTime.ca ships worldwide — availability and lead times can be confirmed directly with the LeadTime.ca team for your specific region and quantity.

Why Order the 6AV2123-2JB03-0AX0 from LeadTime.ca

  • LeadTime.ca ships the Siemens 6AV2123-2JB03-0AX0 worldwide — no geographic restrictions on orders
  • Real-time stock status and lead time confirmation available before you commit to a purchase
  • Volume pricing available for OEMs, panel builders, and systems integrators ordering in quantity
  • The LeadTime.ca team can assist with confirming compatibility against your specific PLC model and TIA Portal version before the order is placed
  • Hard-to-source and extended lead time industrial automation parts are a core specialty — not a secondary category

At-a-Glance Summary: Siemens 6AV2123-2JB03-0AX0 SIMATIC HMI KTP900 Basic

  • 9-inch widescreen TFT display at 800x480 pixel resolution with 65,536 colors and dimmable LED backlighting
  • Analog-resistive touch technology; LED backlight MTBF of 20,000 hours at 25°C
  • 24V DC supply required; 19.2V to 28.8V permissible range; 5.5W typical active power consumption at 230mA rated current
  • Single PROFINET Industrial Ethernet port (RJ45) with 2 status LEDs; one USB port supporting up to 16 GB; no RS-232, RS-485, or MPI/DP
  • Compatible PLC systems: S7-1200, S7-1500, S7-200 only — NOT S7-300 or S7-400
  • 10 MB fixed user data memory; no expansion slots
  • Engineering platform: STEP 7 Basic or STEP 7 Professional (TIA Portal V13 or later) with integrated WinCC Basic; WinCC flexible not supported
  • Panel dimensions: 267mm x 182mm x 39.4mm; mounting cutout: 251mm x 166mm; weight: 1,130g
  • Operating temperature: 0 to 40°C; storage: -20 to 60°C; max tilt: 35 degrees; NEMA Type 4 and Type 4x front rating
  • Certifications: CE, cULus, RCM; supports portrait and landscape mounting orientation