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Controlling SIMODRIVE POSMO A Positioning Motors in SIMATIC PCS 7 V8.1

Controlling SIMODRIVE POSMO A Positioning Motors in SIMATIC PCS 7 V8.1

In SIMATIC PCS 7 V8.1, the legacy SIMODRIVE POSMO A positioning motor (e.g., order number 6SN2132-1BF11-1BA0) is no longer natively supported by modern Drive ES PCS 7 APL libraries. To control a POSMO A drive over PROFIBUS DP in PCS 7 V8.1, you must either migrate the classic POS_CONTROL_POSMO_A block from your legacy PCS 7 V7.0 library into the Master Data Library or implement the certified Siemens application pattern utilizing the standard APL FbDrive block (FB 1881) paired with MotSpdCL (FB 1856) to handle cyclic PROFIBUS DP PPO telegram communications.

Table of Contents

Retirement of SIMODRIVE POSMO A in Modern APL Libraries

When migrating legacy automation projects from SIMATIC PCS 7 V7.0 to PCS 7 V8.1 SP1, engineers frequently encounter hardware integration challenges regarding specialized positioning drives such as the SIMODRIVE POSMO A (e.g., 75W model 6SN2132-1BF11-1BA0).

In older PCS 7 V7.0 projects, the drive was controlled using a dedicated technological block typically named POS_CONTROL_POSMO_A from the classic Drive ES or Motion Control library.

However, upon upgrading to Drive ES PCS 7 V8.1, engineers discover that the POSMO A family has been officially phased out from modern APL-style libraries. The modern Drive ES V8.1 catalog focuses exclusively on current SINAMICS drives (G120, S120) and legacy MICROMASTER 4, leaving POSMO A without a direct APL replacement block.

PROFIBUS DP Communication Architecture for POSMO A

The SIMODRIVE POSMO A is a decentralized, intelligent positioning motor that interfaces with the automation system as a standard PROFIBUS DP slave using Parameter-Process Data Object (PPO) telegrams:
* Process Data (PZD): Handles time-critical cyclic control: Control Word (STW1), Status Word (ZSW1), position setpoint / speed setpoint, and actual position feedback.
* Parameter Data (PKW): Handles acyclic reading and writing of drive internal parameters (acceleration ramps, torque limits, homing offsets).

Because POSMO A adheres strictly to the standard PROFIdrive profile over PROFIBUS DP, it does not require a proprietary closed-source driver to operate. Any standard PCS 7 driver block capable of processing PROFIdrive telegrams can control the motor.

Comparison Table - POSMO A Integration Approaches in PCS 7 V8.1

The following table compares the two viable methods for controlling a SIMODRIVE POSMO A motor in PCS 7 V8.1.

Technical ParameterLegacy Block Migration (POS_CONTROL_POSMO_A)Modern APL Pattern (FbDrive + MotSpdCL)Library OriginLegacy PCS 7 V7.0 / Drive ES ClassicStandard PCS 7 V8.1 APL LibraryWinCC Faceplate LookClassic WinCC V6/V7 graphic styleModern APL vector faceplate (@PG_MotSpdCL.pdl)Positioning FunctionsBuilt-in target position registersSetpoint speed / external positioning logicAPL Quality Codes (ST)No (Classic REAL/BOOL only)Full APL Signal Status (16#80) supportEngineering EffortLow (Direct block copy)Moderate (Requires signal mapping)Long-Term SupportObsolete (Restricted maintenance)Fully supported under current PCS 7 standards

Step-by-Step Engineering and Integration Workflow

To implement POSMO A control in PCS 7 V8.1, execute one of the two following workflows:

Method 1: Migrating Classic POS_CONTROL_POSMO_A Block

  1. Export Block from V7.0 Project:
    * Open the legacy PCS 7 V7.0 project in SIMATIC Manager.
    * Locate POS_CONTROL_POSMO_A in the offline block folder.
    * Export the block along with its associated WinCC faceplates (@PG_POSMO_A...).
  2. Import into V8.1 Master Data Library:
    * Open the PCS 7 V8.1 Multiproject Master Data Library.
    * Paste the block into the Blocks folder.
    * Copy the faceplate PDL files into the OS project's GraCS directory.
  3. Configure HW Config:
    * Insert the SIMODRIVE POSMO A GSD file (SIEM8044.GSD) onto the PROFIBUS DP master system.
    * Assign the PPO type matching the classic block (e.g., PPO Type 1 or 2).
    * Compile HW Config and CFC.

Method 2: Modern APL Integration via FbDrive (FB 1881)

  1. Configure Hardware:
    * In HW Config, configure POSMO A with Standard Telegram 1 or PPO Type 1.
    * Assign I/O addresses to a defined Process Image Partition (PIP).
  2. Instantiate Driver Blocks in CFC:
    * In CFC, insert the APL channel driver FbDrive (FB 1881).
    * Interconnect the drive logical base address (LADDR) from HW Config.
    * FbDrive automatically handles PROFIdrive control word generation and status word decoding.
  3. Interconnect to MotSpdCL (FB 1856):
    * Connect FbDrive outputs to the technological speed control block MotSpdCL.
    * Operators control the drive using standard APL faceplates with full interlocking, alarm handling, and mode switching.

Verification

Confirm that POSMO A communication and control operate reliably:

  1. Verify PROFIBUS DP Bus Communication:
    * Inspect the physical LED indicators on the SIMODRIVE POSMO A housing.
    * Confirm that the green RUN LED is illuminated and the red BF (Bus Fault) LED is extinguished.
  2. Verify CFC Driver Telemetry:
    * Open the CFC chart containing FbDrive or POS_CONTROL_POSMO_A in Test Mode.
    * Confirm that output Status1 / ZSW1 reflects active drive ready status (16#...).
  3. Test Motion Execution:
    * From the WinCC faceplate or CFC manual mode, issue an enable and run command.
    * Confirm that the motor accelerates smoothly to the target setpoint and feedback position updates in real time.

Limitations and Operational Precautions

  • Hardware Obsolescence Notice: SIMODRIVE POSMO A is a discontinued legacy hardware product. For new installations or equipment replacement, Siemens strongly recommends modern SINAMICS S120 or SIMATIC Micro-Drive systems.
  • GSD File Requirement: If the POSMO A does not appear in the STEP 7 HW Config catalog, install the official PROFIBUS GSD file (SI8044AX.GSD) via Options -> Install GSD Files.
  • Torque Limiting During Commissioning: When commissioning positioning sequences, set conservative torque and speed limits in POSMO A parameters to prevent mechanical collision damage.

Engineer FAQ

Can POSMO A perform positioning without an external positioning block?

The POSMO A contains an internal motion controller. By writing target position coordinates and control bits directly into PPO parameter words, the motor executes absolute or relative positioning autonomously.

Does Drive ES PCS 7 V8.1 support SIMODRIVE 611?

Like POSMO A, SIMODRIVE 611 universal drives are officially retired from modern APL libraries, but can be integrated using standard PROFIdrive telegrams via FbDrive.

What baud rates are supported by POSMO A on PROFIBUS DP?

SIMODRIVE POSMO A supports all standard PROFIBUS DP transmission rates up to 12 Mbps with automatic baud rate detection.

Where can I find the classic POS_CONTROL_POSMO_A documentation?

Documentation for classic POSMO blocks is archived in Siemens Industry Online Support Entry ID 64181993 and the legacy Drive ES V6.x manuals.

Technical References

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Related Tags

  • SIMODRIVE
  • POSMO-A
  • FbDrive
  • MotSpdCL
  • PROFIBUS-DP
  • Drive-ES
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