Siemens TP700 Comfort HMI Replacement Guide

Overview

The Siemens SIMATIC HMI TP700 Comfort (6AV2124-0GC01-0AX0) has served as an industry-standard 7-inch touch-screen operator interface for over a decade. Built to handle complex, high-performance visualization tasks, this widescreen panel integrates seamlessly with Siemens S7-1200, S7-1500, and legacy S7-300/400 controllers.

As Siemens advances its industrial automation portfolio, the classic Comfort Panel family is transitioning through its product phase-out milestones (PM400 and moving toward PM500 discontinuation). System integrators and maintenance departments must decide whether to execute a 1:1 hardware swap using surplus/refurbished stock or migrate projects to the newer SIMATIC Unified Comfort Panel platform (MTP700). This guide provides the complete engineering specifications, compatibility matrices, and step-by-step procedures required to manage the transition smoothly.

Legacy Product Information

The legacy TP700 Comfort is recognized by its distinct anthracite aluminum bezel, resistive glass touch screen, and comprehensive array of rear interface ports.

Key Technical Specifications (6AV2124-0GC01-0AX0):

• Display Size: 7.0-inch TFT widescreen display with 16 million colors
• Resolution: 800 x 480 pixels (WVGA)
• Touch Technology: Analog resistive single-touch
• Backlight: LED, MTBF rating of 80,000 hours (dimmable down to 0%)
• User Memory: 12 MB application memory plus integrated system memory
• Interfaces:
  • 2x RJ45 Profinet/Ethernet interfaces (integrated 2-port switch)
  • 1x RS-422/RS-485 interface (D-sub 9-pin for Profibus/MPI)
  • 2x USB 2.0 type A interfaces, 1x Mini-USB Type B (service port)
  • 2x SD card slots (1x System, 1x Data)
• Input Voltage: 24 V DC (operational range 19.2 to 28.8 V DC)
• Rated Current: 0.5 A regular, up to 1.2 A inrush current
• Environmental Enclosure Rating: IP65 front protection, IP20 rear protection
• Certification: CE, cULus, FM Class I Div 2, ATEX Zone 2/22

Lifecycle Status:

The TP700 Comfort is currently designated as a legacy product. While Siemens continues to offer repair services and limited production runs, original hardware prices have escalated significantly, and long-term availability remains constrained. Standard components are transitioning toward full material retirement, making proactive replacement planning essential to avoid costly, unexpected downtime.

Recommended Replacements

Depending on your engineering budget, software constraints, and available downtime, there are three primary replacement mechanisms.

Compatibility Considerations

Mechanical Footprint

The physical installation cutout of the TP700 Comfort measures exactly 197 mm (width) x 141 mm (height) with an installation depth of 63 mm.

• MTP700 Unified Comfort: Direct mechanical drop-in. It shares the identical cutout dimensions of 197 mm x 141 mm and has a depth of 64 mm. No metal modifications or adapter plates are required to physically mount this unit.
• KTP700 Basic: While the screen size is identical, the KTP700 cutout size differs. Migrating down to a Basic panel requires customized bezel filling or adapter mounting plates.

Electrical and Signal Interfaces

• Power Supply Terminal: Both the TP700 Comfort and MTP700 Unified utilize a standard Siemens 4-pin 24 V DC terminal block. Pinouts are matched (L+, M, FE), simplifying the wiring transfer.
• Legacy Protocols (Profibus DB9): The TP700 has an onboard D-sub 9-pin connector. The MTP700 Unified Comfort does not. If your legacy configuration communicates with an S7-300/400 PLC over Profibus, you must install an IE/PB Link gateway or upgrade the PLC interface to Profinet.

Programming Software and Engineering Tools

• TP700 Comfort uses WinCC Comfort, WinCC Advanced, or WinCC Professional (TIA Portal V11 through V19).
• MTP700 Unified requires WinCC Unified (TIA Portal V16 or higher). This is a completely different engineering engine based on JavaScript and modern web technologies rather than VBScript and WinCC basic graphics. Direct migration of graphics is possible via the TIA Portal "Data2Unified" add-in, but manual verification is required.

Upgrade Benefits

Upgrading to the new MTP700 Unified platform yields significant enhancements for modern control topologies:

1. Capacitive Multi-touch Display: The projected capacitive (PCAP) glass front supports multi-touch gestures (pinching, zooming, swiping), mirroring modern consumer tablets.
2. Web-Based Visualization: Since Unified is built on HTML5, the HMI screen can be securely viewed and operated from any authorized web browser.
3. Siemens Industrial Edge Enabled: Run edge apps, process local data, and push variables directly to cloud databases (AWS, Azure) without modifying the PLC code.
4. Enhanced Security Policies: Built-out user management integration, encrypted communication channels, physical port disabling, and auto-logging features.
5. Dynamic SVG Vector Graphics: Unlike the pixel-dependent bitmaps on the TP700 Comfort, vector graphics on the Unified scale losslessly, ensuring crystal-clear displays at all zoom levels.

Common Migration Challenges

Coding Language Transition

The TP700 Comfort relies on VBScript for complex control sequencing and data management. WinCC Unified does not support VBScript; all local scripting must be converted to JavaScript (JS). Automatic conversion utilities will flag these scripts but cannot rewrite complex logic blocks. Maintenance engineers must manually recreate script actions.

Recipe System Architecture

The classic machine recipe engine (using native .csv files or Comfort recipe views) has been entirely upgraded in the Unified architecture. You must export data records from the classic system and import them into the new parameter control structures inside TIA Portal.

High-Humidity/Corrosive Environments

The projected capacitive glass front of the MTP700 Unified Panel is sensitive to continuous water pooling or dense dynamic condensation, which can simulate phantom finger presses. If your production floor involves intensive washdowns or highly humid chambers, sticking with a 1:1 refurbished TP700 Comfort resistive touch panel is often the more reliable choice.

Step-by-Step Replacement Procedure

Follow this strict procedure to swap a failed or worn-out TP700 Comfort HMI with a physical replacement.

Phase 1: Software Backup and Export

1. Connect an empty, FAT32-formatted USB/SD card to the system slot of the active TP700 Comfort.
2. Open the Control Panel on the device, select Backup/Restore, and execute a full binary backup of the runtime file (*.psb). Note that a .psb backup can only be restored to an identical TP700 Comfort model.
3. If you are migrating to the Unified Platform, open the original TIA Portal project. Ensure you have the WinCC Comfort and WinCC Unified software packages licensed and installed.
4. Right-click your TP700 Comfort in the project tree and choose Change Device.
5. Select the MTP700 Unified Comfort from the selection tree. The software will attempt to convert screens, tag databases, and basic alarms. Run the Data2Unified Add-in to assist with structural script and dynamic graphics adaptation. Correct any compilation warnings before downloading.

Phase 2: Hardware Demounting and Preparation

1. Safety First: Disconnect and tag out (LOTO) all primary power suppliers feeding the 24 V DC control panel.
2. Unthread the ground strap screw connected to the panel chassis and safely store the hardware.
3. Unplug the 4-pin 24 V DC power terminal block from the lower left-hand side of the device.
4. Disconnect the communications cables: RJ45 Profinet cables (Port 1 / Port 2) or the DB9 Profibus-MPI connector.
5. Using a standard flat-head screwdriver or a 2.5 mm Allen wrench, loosen the built-in mechanical clamping frames mounted along the top, bottom, and sides of the legacy panel casing.
6. Push the device gently from the rear out through the cabinet front cutout. Have a helper support the unit from the outside to prevent the physical screen assembly from dropping.
7. Clean the panel cutout edges of any residual dirt, grease, or deteriorated nitrile sealant gasket material.

Phase 3: Hardware Mounting and Installation

1. Ensure the new or refurbished HMI’s integrated sealing gasket is systematically seated along the perimeter channel of the bezel.
2. Align the replacement device in the panel cutout and slide it forward.
3. Insert the mounting clamps into the allocated recesses on the panel housing. Tighten them evenly in a crosswise pattern to a torque profile of 0.2 Nm to ensure an IP65 watertight seal without bowing the plastic housing.
4. Connect the functional grounding strap from the system ground grid to the designated PE spade terminal on the rear chassis.
5. Reconnect all engineering/communication terminal networks (Profinet/Ethernet or Profibus).
6. Insert the 24 V DC terminal block, ensuring correct polarity.

Phase 4: System Start-Up and Testing

1. Re-energize the 24 V DC power loop. Observe the cold boot cycle on the panel screen.
2. Enter the device standard boot loader menu or operating system control panel.
3. Configure the static IP address, subnet mask, and gateways to match your machine system parameters.
4. For a 1:1 swap: Insert the USB backup flash drive, navigate to Backup/Restore, and restore the .psb database.
5. For a Unified transition: Download the upgraded visualization configuration directly through TIA Portal (Ethernet interface).
6. Verify active PLC interfaces, screen transitions, alarm logs, and recipe system readouts to confirm a successful installation.

Frequently Asked Questions

Q1: Can I load a classic WinCC project directly onto a new Unified panel?

No. WinCC Comfort (the software engine behind the legacy TP700) and WinCC Unified are completely different visualization software platforms. While you can automatically convert physical screen layouts and tag mapping databases using the integrated migration tools in TIA Portal, you will need to manually rebuild your scripts, custom controls, and user security permissions.

Q2: What causes a "License Missing" error message during the migration?

This error is usually caused by using features not covered by your standard software licensing. On a legacy TP700 Comfort panel, advanced functions such as Audit trails or extensive recipe logs require specific runtime licensing keys. If migrating to the Unified Platform, you must ensure that your host system has the proper WinCC Unified Comfort Runtime license loaded onto the target panel via the Automation License Manager.

Q3: My production floor uses gloves. Will the capacitive touchscreen on the Unified panel work?

Yes. The PCAP touchscreen display on the MTP700 Unified Panel supports operation with standard multi-use work gloves, nitrile gloves, and industrial safety mitts. You can adjust the touch controller sensitivity settings directly within the panel's Unified system control panel to optimize detection for thicker gloves.

Q4: How is the physical life expectancy of a refurbished TP700 compared to a brand-new MTP700?

A professionally refurbished TP700 Comfort Panel sourced from a reputable supplier operates under the same technical parameters as a brand-new component. The LED backlighting is rated for 80,000 continuous hours. To maximize the field service life of either panel, ensure that the display automatic dimming timer is active, preventing backlight burn-in during long idle shifts.

Related Products & Families

To complete your migration or maintain your legacy infrastructure, look to these related product families:

• SIMATIC S7-1200 & S7-1500 Controller Systems: The native pairing partners for the TP700 & MTP700.
• SIMATIC Memory Cards (6ES7954-Series): Required for loading reliable PLC code and logging process parameters.
• Profinet Accessories: Industrial Ethernet switches, preconfigured Cat6 RJ45 patch cables, and field bus connectors.
• Larger Comfort Panel Upgrades: If your lines are scaling, explore the TP900 Comfort (9-inch design) or TP1200 Comfort (12-inch design) families.

Need Help?

Whether you are looking to source a high-quality, 1:1 legacy replacement to avoid a complex software rewrite or need advice on upgrading your setup to the next generation of HMI technology, Palm Parts Solution can support your operations.

We supply an extensive range of new, surplus, and fully tested refurbished Siemens parts—including the SIMATIC TP700 Comfort HMI series—backed with comprehensive warranties to keep your production lines moving. Get in touch with our engineering support team today for hardware quoting, firmware provisioning, or component diagnostic assistance.