Replacing OP177B with KTP700 for Simotion D445 Communication

Overview of the OP177B to KTP700 Migration Challenge

Replacing a legacy SIMATIC OP177B operator panel with a current SIMATIC KTP700 Comfort Panel on a SIMOTION D445 motion controller is a frequent lifecycle task. The OP177B, originally programmed with WinCC flexible 2008 SPx, talks to the D445 over PROFINET using a SIMOTION HMI connection that was provisioned at commissioning time. The newer KTP700 (6AV2 124-1GC01-0AX0) is engineered exclusively for TIA Portal / WinCC Comfort / WinCC Advanced engineering, and that is where most migration attempts stall.

The two root issues encountered in the field are:

1. The D445 (firmware V4.1, PN V2.2) does not expose a published HMI tag interface that the TIA Portal Comfort Panel catalog can consume without a SIMOTION device proxy.
2. The required TPDRIVE_LIB_SIMOTION_4_1_5.2.4 OA package is not installed in SCOUT, which causes DCC chart compilation errors during device proxy initialisation.

Siemens does not provide a drop-in script to import OP177B tags into a KTP700 project. The supported path is to upgrade the D445 to a D445-1 with firmware V4.3 SP1 (or later), regenerate the device proxy in SCOUT/TIA, install the correct OA package, and then re-bind the Comfort Panel tags through the regenerated proxy.

Hardware and Firmware Comparison

Prerequisites for the Migration

• Replacement HMI: KTP700 Comfort, article 6AV2 124-1GC01-0AX0 (or KTP700 Basic 6AV2 123-2GB00-0AX0 if WinCC Basic / RT Advanced is acceptable).
• Spare D445-1 with matching performance class, preloaded with SCOUT firmware V4.3 SP1 or later (V4.4 / V4.5 / V5.1 / V5.2 are also valid).
• Engineering PC with both SCOUT TIA V4.5 (or V5.x) and TIA Portal V15.1 or newer (V16 / V17 recommended for the latest HMI images).
• TPDRIVE_LIB_SIMOTION_4_1_5.2.4 OA package (or higher, e.g. 4_1_5_2_5) on the engineering PC.
• The original OP177B WinCC flexible project, exported as a .fwx / .hmi archive for tag mapping reference.
• SIMOTION D445-1 GSD / HSP file installed in TIA Portal: SIMOTION D4xx V4.3 (HSP) or later.
• PROFINET topology, IP plan, and node names for the new HMI, controller, and I/O.

Step-by-Step Migration Procedure

Step 1 - Replace the D445 with a D445-1 in the hardware

1. Open the STEP 7 / TIA Portal project and navigate to the device configuration of the D445.
2. Right-click the D445 module and select "Replace device" → SIMOTION D445-1.
3. Match the order number suffix (1AD00-0AA0 for V4.3 base, 1AD00-0AB0 for newer variants).
4. Download the new HW configuration to the D445-1 controller.
5. Verify the controller starts in RUN, no SF/BF LED errors, and that the firmware version reads back as V4.3 or later in the online diagnostics.

Step 2 - Install the TPDRIVE_LIB_SIMOTION_4_1_5.2.4 OA Package

1. Open SCOUT TIA on the engineering PC.
2. Go to Options → Support Packages → Install Support Package.
3. Browse to the TPDRIVE_LIB_SIMOTION_4_1_5.2.4.ax file. If you do not have it locally, it is bundled with the SCOUT TIA V4.5 installation media under Support Packages → SIMOTION_HMI.
4. Restart SCOUT after installation. The package registers new block types and a DCC chart type in the library catalogue.
5. Open the SCOUT project containing the D445-1. The library appears under Options → Block Types.

Step 3 - Update the DCC Charts and Recompile

The OA package contributes chart-of-type DCC_SIMOTION_HMI charts and the supporting function blocks (FBs). Old DCC charts compiled under a missing library version appear with a yellow warning and the compiler reports Library error: TPDRIVE_LIB_SIMOTION_4_1_5.2.4 not found. Resolve as follows:

1. Open the affected DCC chart in SCOUT.
2. Right-click the chart background → Options → Block Type → enable the TPDRIVE_LIB_SIMOTION_4_1_5.2.4 block type.
3. Recompile the chart with Project → Compile and check consistency.
4. For multi-instance charts, repeat on every chart that references a TPDRIVE block.
5. Re-download the program to the D445-1.

Step 4 - Generate the SIMOTION Device Proxy

1. In SCOUT, open the SIMOTION D445-1 device.
2. Go to Device Proxy → Generate. SCOUT publishes the controller's tags, alarms, and trend views into a .zip proxy file consumable by TIA Portal.
3. Confirm the proxy lists the new firmware version (V4.3+) and the TPDRIVE chart FBs.

Step 5 - Import the Proxy in TIA Portal and Bind the KTP700

1. Open the TIA Portal project that contains the KTP700.
2. Drag the .zip proxy onto the D445-1 device or use Options → SIMOTION device proxy → Import.
3. Add a new HMI connection from the KTP700 to the D445-1 PROFINET port (X150 P1 / P2). Use the SIMOTION HMI connection type, not a generic S7 connection.
4. The HMI tag table of the KTP700 is now populated automatically from the proxy. Re-map any custom OP177B tags that were not part of the SCOUT export.
5. Compile the KTP700 project and download the HMI image.

Root Cause Analysis: Why the Original Setup Fails

Verification Procedure

1. Controller online: Connect SCOUT to the D445-1. Confirm the firmware version reads V4.3 (or newer) and that all DCC charts are in state RUN without a yellow alarm indicator.
2. Proxy integrity: In TIA Portal, right-click the D445-1 → SIMOTION device proxy → Show version. The version stamp must match the SCOUT build (e.g. 4.1.5.2.4).
3. HMI connection: On the KTP700, navigate to System → Connections and confirm the SIMOTION HMI connection shows status Connected. PROFINET partner should report the D445-1 PN interface MAC.
4. Tag round-trip: Force a value on a DCC chart output in SCOUT (e.g. nSpeedSetpoint); the KTP700 connected tag must update within one PROFINET cycle (typ. 4 ms for RT class 1).
5. Alarm test: Trigger a configured alarm in the SCOUT program; verify it appears on the KTP700 alarm view with the correct priority and acknowledgment behavior.
6. Touch response: Toggle an HMI output tag from the panel; confirm the D445-1 input tag changes in SCOUT within one bus cycle.

Hardware Commissioning Notes for the KTP700

• Power the panel with 24 VDC (range 19.2 - 28.8 V) on the X80 connector. Reverse-polarity protection is built in but observe the pinout in the SIMATIC HMI Comfort Panels Operating Instructions.
• Configure the PROFINET interface (X1) with a static IP within the same subnet as the D445-1, and assign a unique PROFINET device name (e.g. kp700-cntrl-01). The name must be written to the panel via TIA Portal → Online → Assign PROFINET device name.
• Enable PROFINET IO → RT class 1 on the HMI port. The D445-1 supports RT class 1 and 2; class 3 is not available on Comfort Panels.
• For a redundant ring topology, use a SCALANCE switch between the panel and the controller; the panel itself does not support MRP.

Field-Proven Caveats and Edge Cases

• SCOUT TIA version drift: If the engineering PC is upgraded from SCOUT V4.4 to V4.5 mid-project, the OA package 4_1_5.2.4 must be re-installed. Compile errors on existing charts are the typical symptom.
• D445-1 dual PROFINET port: The D445-1 has two PROFINET interfaces (X150 P1, P2). The HMI connection must be bound to the same interface the D445-1 uses as PROFINET IO controller. On a swapped-port machine, the HMI goes online but the tags stay empty.
• WinCC flexible → WinCC Comfort migration: The TIA Portal "Migrate WinCC flexible project" wizard only handles the project skeleton. OP177B-specific function-key labeling and 24-key navigation must be re-designed for the KTP700 (no function keys on the KP variant).
• Tag-prefix conflict: When re-using a PROFINET device name from the legacy OP177B, TIA Portal may silently fail to assign the new name. Clear the PROFINET name via Online → Accessible nodes → Reset to factory first.
• OEM HMI versions: A KTP700 with a custom OEM image (e.g. 6AV2 124-1GC01-0AX0-Z) requires the matching ProSave image; standard Comfort Panel images do not boot on OEM hardware.

Safety and Standards Notes

Both the D445-1 and the KTP700 are designed for use in industrial environments according to EN 61131-2 and EN 61000-6-2 / EN 61000-6-4. The Comfort Panel is not a safety HMI; if the original application used the OP177B as part of a safety-relevant display (e.g. SIL 2 / SIL 3 indication), the replacement must be re-validated against IEC 61508 and EN ISO 13849-1. A Comfort Panel is approved for EN 61010-2-201 in industrial control panels and is not suitable as the primary operator interface for a Category 1 / 2 / 3 safety function. Pair it with a Failsafe HMI (e.g. SIMATIC HMI KTPxF Mobile Panel or a separate S7-1500F I/O channel) where the application requires it.

Verify the local installation against the most recent revisions of:

• SIMOTION D4xx Manual - controller commissioning and firmware release notes.
• SIMATIC HMI Comfort Panels Operating Instructions - electrical installation and PROFINET commissioning.
• SIMOTION → SIMATIC HMI Integration Manual - device-proxy mechanism and TIA Portal binding.
• SCOUT TIA Online Help - OA package and DCC chart handling.

Troubleshooting Matrix - Quick Reference