Resolving p5275 Reference in SINAMICS S210 for Interpolating Axes

Problem Overview

The SINAMICS S210 Operating Instructions (Siemens document S210_1FK2_op_instr_092019_en-US) describe parameter S5301, bit 07, as a function that adapts subordinate axes to the dynamic response set in p5275. The bit 07 text indicates: "This function adapts these axes to the dynamic response set in p5275. This is necessary for interpolating axes. The time in p5275 should be set according to the axis with the lowest dynamic response."

On commissioning the S210 with a 1FK2 servo motor in a multi-axis group, the integrator cannot locate p5275 in:

• The parameter list displayed in Startdrive / SINAMICS StartDrive in TIA Portal.
• The web server of the S210 (default https://<ip>/index.html, user admin, password on the drive label).
• The function diagrams or parameter manuals shipped with the device.

This article documents the root cause, the underlying function, and a field-proven workaround for film-coupled axes with printmark (registration) control where interpolation errors appear as mark drift during acceleration and deceleration.

SINAMICS S210 System Context

The SINAMICS S210 is a single-axis AC/AC servo drive system from Siemens, designed for highly dynamic motion control tasks. Per the Siemens SINAMICS S210 product page and the operating instructions referenced above, key characteristics are:

The S210 normally operates as a slave under a higher-level controller (SIMATIC S7-1500 / S7-1200 with Motion Control or a SIMOTION / SINUMERIK). The "S" prefix in S5301 denotes a Safety Integrated or Setpoint-related parameter inside the SINAMICS parameter model; the prefix p in p5275 denotes an editable parameter (Parameter), as opposed to r (read-only) or S (status/control word).

Root Cause: Cross-Reference Between Documentation and Firmware

The 09/2019 English revision of the operating instructions references p5275 in the description of S5301.7, but the same parameter number does not exist in the firmware parameter tree for the S210 base firmware as documented at the time of that release. The reference most likely originated from one of the following sources:

1. A planned parameter that was renamed or merged into a different number (typical during the 1FK2 motor rollout, where Siemens refactored the speed/position controller parameter layout across SINAMICS S120, S210, and V90).
2. A documentation artifact inherited from a SINAMICS S120 function block (the S210 shares much of the controller structure with the S120 Booksize compact).
3. A parameter that is exposed only when a specific Technology Extension or SIMOTION-side add-on is enabled.

For integrators encountering this discrepancy on a current system, the practical answer is: the function described by bit 07 of S5301 must be implemented at the controller level (SIMATIC / SIMOTION), not on the drive, because the S210 firmware does not expose a matching speed-controller time-constant parameter for cross-axis dynamic matching.

Function Intended by p5275

Based on the text in S5301 bit 07, the function of p5275 is to store a dynamic response time constant in seconds (or milliseconds) that the slave axis uses to soft-match its closed-loop behavior to the slowest mechanical axis in a coupled group. This is required for true interpolation because:

• Each drive has its own speed-controller cycle (62.5 µs on S210 by default, can be derated to 125 µs or 250 µs).
• Each drive has its own current and speed controller tuning that is optimized for its motor's moment of inertia J.
• Position setpoints issued by the controller are dispatched at the PROFIdrive level, but the contour error between two coupled axes depends on how closely their actual velocities track each other during transients.

If one axis is much stiffer (lower inertia, higher torque margin) than another in the group, a step in commanded acceleration causes the faster axis to advance beyond the slower one, producing a transient contour error that is exactly the printmark drift described in the source field case.

Field Case: Three Film-Coupled Axes with Printmark Registration

The reported application is a packaging or converting line in which:

• Three S210 / 1FK2 servo axes pull film through a mechanical loop (dancer + nip rolls).
• A print-mark sensor reads a registration mark on the film.
• The higher-level controller (S7-1500 with TO_PositioningAxis or external cam) issues a correction pulse to keep the print mark at a fixed angular position relative to a cutting or sealing tool.

Observed symptom: "During acceleration and deceleration, printmarks shift forward/backward." This is the textbook signature of:

1. Mismatched closed-loop bandwidth (Kv factor / proportional gain) between the three axes.
2. Mismatched torque limits or jerk limits applied per axis.
3. Mechanical compliance (the film itself) absorbing short-term velocity differences, which the print-mark loop then misinterprets as a true position error and tries to correct.

The dynamic-response adaptation described in S5301.7 is intended to address items 1 and 2 by setting all axes to follow the dynamic profile of the slowest one. Because the S210 firmware does not expose p5275 directly, the equivalent behavior must be created on the controller side.

Workaround: Controller-Side Dynamic Response Adaptation

The substitution strategy replaces the missing p5275 with a uniform dynamic profile on the controller. Implement the following on the SIMATIC S7-1500 (or equivalent) using the Technology Objects (TO) library:

1. Identify the slowest axis. From the S210 web server, navigate to Diagnostics → Speed controller and record the Speed controller loop gain (Kpn) and Speed controller integral time (Tnn) of all three drives. The slowest axis has the lowest Kpn / largest Tnn.
2. Equalize the controller tuning. On the S210 with the fastest axis, navigate to Parameters → Drive functions → Speed controller and reduce Kpn to match the slowest drive. Use the same Tnn value. Do not auto-tune again without re-running the same procedure on all three drives.
3. Set identical jerk and acceleration limits. The jerk limit, in particular, dominates the registration error during accel/decel. Force all three MC_MoveAbsolute / MC_MoveVelocity calls to use the same Jerk argument. The units on S7-1500 Technology Objects are typically mm/s³ (linear) or °/s³ (rotary).
4. Limit torque margins. Set p640 (current limit) on each S210 to the value of the lowest-rated motor in the group. This caps the bandwidth difference caused by torque saturation.
5. Enable dynamic response adaptation at the TO level. In the SIMATIC axis configuration, set the Dynamic response adaptation (cross-axis master-slave) for interpolating groups. The S7-1500 TO supports a slaving with dynamic response adaptation mode where the slave follows the master's actual dynamics filtered by a PT1 element. Use the filter time constant of the slowest axis as the PT1 time constant.

The PT1 time constant is the functional equivalent of p5275 in this architecture. Typical values on a 1FK2 film line with three 0.4 kW to 1 kW axes are 4 to 12 ms. Start at 8 ms and trim by observing the printmark error on the diagnostic trace.

Commissioning Procedure

Use this procedure on a cold machine with the film unloaded (no product) to verify behavior before running production:

1. Wire check. Verify each S210 is on its own PROFINET IRT slot, with the controller configured as sync master. Confirm the PROFINET send clock is 1 ms (typical for S210) and the IRT top mode is enabled.
2. Parameter upload. Read the current parameter set from each drive via StartDrive. Note r0027 (actual speed) and r0063 (speed setpoint) for each axis during a slow jog.
3. Tuning baseline. Run the auto-tuning wizard on each axis individually with no coupling. Record Kpn, Tnn, and the resulting velocity loop bandwidth (the auto-tuning log stores these).
4. Coupling test. Engage the mechanical coupling (close the nip rolls) and command a 90° / 100 mm sinusoidal motion at 0.5 Hz. Use the S210 trace to capture actual position, actual velocity, and following error. Confirm the three axes track within 0.5° at the peak velocity.
5. Acceleration test. Command a 0.5 s acceleration to a 1000 mm/s cruise, hold for 1 s, and decelerate back. Capture the printmark sensor signal and the three actual positions on a common time base. Compute the printmark drift:

drift[mm] = k_mark * (axis_actual_position[mm] - axis_setpoint[mm]) + bias

where k_mark is the print-mark to position scaling factor and bias is the steady-state offset measured at cruise velocity.

6. Iterate. Adjust the Kpn of the fastest axis down by 10% per pass until drift at the end of the accel phase is within tolerance. Tolerance for typical packaging registration is ±0.3 mm.

Verification and Diagnostics

After the workaround is applied, validate the fix with the following checks on the S210 web server (Diagnostics → Trace) and the controller's online trace:

Firmware and Documentation Considerations

Because the S210 firmware is evolving, integrators working on machines that ship in 2024 and beyond should:

• Verify firmware level. The firmware version is shown on the S210 web server homepage as FW version (for example, V5.2.x or later). Cross-check the parameter list against the firmware-specific operating instructions, not the 09/2019 paper revision.
• Use StartDrive 17 (or newer). Older StartDrive versions did not index the full S210 parameter tree and may have hidden p5275-equivalent parameters that exist under different numbers. Always run the StartDrive version that ships with the TIA Portal version in use.
• File a SIOS support request. If p5275 is required for a specific application (for example, when the integrator is migrating code from a SINAMICS S120 system), open a support request on support.industry.siemens.com with the S210 serial number, firmware version, and the function diagrams referenced. Siemens R&D can confirm whether the parameter is hidden, removed, or planned for a future release.
• Cache the documentation. The PDF S210_1FK2_op_instr_092019_en-US corresponds to firmware V5.1.x. Newer firmware packages ship with a _changelog in the S210 web server. Always prefer the firmware-matched manual over the 09/2019 paper when a discrepancy arises.

Frequently Asked Questions