Writing Sinamics S110 Parameters on PROFINET with S7-1200

Writing Sinamics S110 Parameters on PROFINET with S7-1200

Overview

The Sinamics S110 is a single-axis servo drive with an integrated PROFINET interface. When controlled by a SIMATIC S7-1200 (for example CPU 1214C DC/DC/DC or DC/DC/Rly), there are two valid ways to read or write drive parameters across PROFINET:

1. Siemens SINAMICS DriveLib for S7-1200 / S7-1500 — a function block library (FB284 / FB285 / FB286) that encapsulates the acyclic PROFIdrive parameter channel.
2. Native WRREC / RDREC — the standard S7-1200 record-write/read system blocks, used directly against the drive's parameter channel slot.

This reference covers both paths. It explains the PROFIdrive parameter request/response structure, telegram selection, the role of DriveLib FB286 for parameter access, the dedicated FBs for closed-loop speed (FB285) and basic positioner (FB284) operation, and how to build a fallback solution with WRREC/RDREC when the library cannot be installed.

Prerequisites

PROFINET Communication Architecture

The S7-1200 and the S110 exchange two traffic classes over PROFINET:

• Cyclic process data — control words, status words, setpoints, actual values. Transported in the configured standard telegram (1, 2, 3, 5, 7, 9, 110, or 111).
• Acyclic record data — used by the DriveLib FBs and by WRREC/RDREC to read/write individual drive parameters. This is the PROFIdrive parameter channel.

Telegram Selection for the S110

The telegram determines which cyclic PZDs (process data words) are mapped. With a 1214C the typical choices for a single-axis S110 are:

Configure the telegram in TIA Portal under Device view → S110 PN → Properties → Module parameters or in StartDrive under the drive device configuration. Both ends must use the same telegram number; mismatch causes a PROFINET alarm ("Telegram configuration error").

Method 1 — DriveLib FB284 / FB285 / FB286

After installing the SINAMICS DriveLib for S7-1200/1500, three function blocks become available under Libraries → SINAMICS S120 DriveLib in TIA Portal:

FB286 — SINA_PARA — parameter access

FB286 is the dedicated function block for the task in the original question: writing (or reading) any S110 parameter through PROFINET. It encapsulates the PROFIdrive parameter channel and handles the request/response handshake automatically.

Standard input / output interface of SINA_PARA (FB286):

Typical call structure in SCL:

// SINA_PARA (FB286) — write p1120 (ramp-up time) = 4.0 s to S110
IF bWrite_RampUp THEN
    SINA_PARA_DB.Enable       := TRUE;
    SINA_PARA_DB.ReqWrite     := TRUE;
    SINA_PARA_DB.Parameter    := 1120;        // p1120 ramp-up time
    SINA_PARA_DB.Index        := 0;           // no index
    SINA_PARA_DB.ValueReal    := 4.0;
    SINA_PARA_DB.AxisNo       := 1;           // DO1 of S110
    SINA_PARA_DB.HW_IDSTW_ZSW := hwTelegram1; // from PLC variable table
    SINA_PARA_DB.ErrorAck     := FALSE;
    bWrite_RampUp := FALSE;
END_IF;

// Read p1082 (max speed) on demand
IF bRead_MaxSpeed THEN
    SINA_PARA_DB.Enable       := TRUE;
    SINA_PARA_DB.ReqWrite     := FALSE;
    SINA_PARA_DB.Parameter    := 1082;
    SINA_PARA_DB.Index        := 0;
    SINA_PARA_DB.ValueReal    := 0.0;          // ignored on read
    SINA_PARA_DB.AxisNo       := 1;
    SINA_PARA_DB.HW_IDSTW_ZSW := hwTelegram1;
    bRead_MaxSpeed := FALSE;
END_IF;

FB285 — SINA_SPEED — speed axis operation

Use FB285 when the S110 is operated as a pure speed axis. The block provides ramp generator, enable logic, and a complete set of input / output signals. Telegram 1, 2, or 110 is required. Typical SCL call:

SINA_SPEED_DB(
    EnableAxis     := bEnableAxis,
    SpeedSetpoint  := rSpeedRef,        // RPM
    AxisNo         := 1,                // DO1
    HW_IDSTW_ZSW   := hwTelegram1,
    HW_IDNSOLL_AIST:= hwTelegram1,
    Enable         := bDriveEnable,
    AckError       := bAck
);

FB284 — SINA_POS — basic positioner

Use FB284 when the S110 runs the integrated basic positioner (EPos) and you need to trigger MDI blocks or traversing blocks from the S7-1200. Telegram 111 is the standard choice. Output signals cover position setpoint, velocity override, mode selection, and jogging. Detailed signal mapping is given in the DriveLib documentation.

Method 2 — Native WRREC / RDREC (PROFIdrive parameter channel)

If DriveLib cannot be installed, or if the S7-1200 firmware is older than required, the same functionality is achievable with the standard record-write/read system blocks. The PROFIdrive parameter channel is located on slot 0 / sub-slot 1 of the drive; each drive object has its own parameter access point.

PROFIdrive parameter request (write)

S7-1200 sample — WRREC write of p1120

// Build 16-byte request buffer
myWriteRequest[0]  := 16#01;  // request reference
myWriteRequest[1]  := 16#01;  // request ID  = write parameter
myWriteRequest[2]  := 16#01;  // axis = DO1
myWriteRequest[3]  := 16#01;  // 1 parameter
myWriteRequest[4]  := 16#10;  // attribute = value
myWriteRequest[5]  := 16#01;  // number of elements
myWriteRequest[6]  := 16#04;  // p1120 high
myWriteRequest[7]  := 16#60;  // p1120 low
myWriteRequest[8]  := 16#00;  // subindex
myWriteRequest[9]  := 16#00;  // reserved
myWriteRequest[10] := 16#41;  // format = IEEE-754 float
myWriteRequest[11] := 16#01;  // 1 value
myWriteRequest[12] := 16#80;  // 4.0 in IEEE-754 little-endian
myWriteRequest[13] := 16#00;
myWriteRequest[14] := 16#00;
myWriteRequest[15] := 16#00;

// Trigger the write
WRREC_DB(REQ      := bWriteStart,
        ID       := hwTelegram1,
        INDEX    := 47,         // 16#2F = parameter access slot
        LEN      := 16,
        DATA     := myWriteRequest,
        DONE     => bWriteDone,
        BUSY     => bWriteBusy,
        ERROR    => bWriteError,
        STATUS   => wWriteStatus);

S7-1200 sample — RDREC read of p1082

// 8-byte read request (header only)
myReadReq[0] := 16#02;  // reference
myReadReq[1] := 16#02;  // request ID = read
myReadReq[2] := 16#01;  // axis = DO1
myReadReq[3] := 16#01;  // 1 parameter
myReadReq[4] := 16#10;  // attribute = value
myReadReq[5] := 16#01;  // 1 element
myReadReq[6] := 16#04;  // p1082 high
myReadReq[7] := 16#3A;  // p1082 low (0x043A)

RDREC_DB(REQ      := bReadStart,
        ID       := hwTelegram1,
        INDEX    := 47,
        MLEN     := 32,
        DATA     := myReadResp,
        VALID    => bReadValid,
        BUSY     => bReadBusy,
        ERROR    => bReadError,
        STATUS   => wReadStatus,
        LEN      => iReadLen);

After a positive read, bytes 10-13 of myReadResp contain the parameter value as IEEE-754 single precision. Swap bytes from big-endian (PROFIdrive) to little-endian (S7-1200) before assigning to a REAL tag.

Procedure — Step-by-step with DriveLib

1. Register on the Siemens Industry Online Support portal and download entry 68034568 ("SINAMICS S120/S110 DriveLib for S7-1200/1500").
2. Open TIA Portal and switch to the project view. Choose Options → Global libraries → Open library and select the unzipped DriveLib file.
3. Add the S110 PN device to the project (right-click Devices & networks → Add new device → Drives → Sinamics S110). Assign a PROFINET device name (e.g. s110-pn) and IP address.
4. Configure the standard telegram. Click the S110 device and under Module parameters → Telegram configuration insert the required telegram (1, 2, 5, 110, 111…). TIA Portal automatically generates the matching PLC tag DB and the HW_IO constant.
5. Open the PLC program block. From the global library drag SINA_PARA_DB (data block) and SINA_PARA (FB286) into the project. Repeat for SINA_SPEED (FB285) and SINA_POS (FB284) as required.
6. Wire the HW_IDSTW_ZSW input of FB286 to the hardware identifier of the PZD slot created in step 4 (use the constant from the PLC tags table).
7. Compile the project and download to the CPU 1214C.
8. Establish the PROFINET connection (assign device name → S110 cycles up → green PROFINET LED on both ends).
9. Test with a known parameter such as p1120 (ramp-up time) or p1082 (maximum speed). Trigger Enable on FB286 and confirm Done=TRUE, Status=16#0000.
10. Read the parameter back in the same way with ReqWrite=FALSE and verify the value matches what was written. Persist with p0971 = 1 if the value must survive a power-off (see note below).

Verification

Troubleshooting Matrix

Special Notes for the S110

• The S110 has exactly one Drive Object (DO1 = Servo). All parameters numbered p0001 to r9999 are addressed with axis/DO = 1.
• The S110 is firmware-bound to PROFINET RT. PROFINET IRT is not supported; cyclic update times down to 1 ms are available.
• Basic safety functions (STO over PROFINET, PROFIsafe) require a Safety Integrated firmware option and telegram 30 / 31 / 901 / 902.
• The acyclic parameter channel can carry one or two parameters per record (16#01 / 16#02 in the "number of parameters" field). For batch writes build the request up to 240 bytes total.
• Some parameters are read-only (r… instead of p…). The drive returns error 0xDF80 in the response. Always cross-check in the S110 List Manual (entry ID 109739545).

Related Documents

• SINAMICS S120/S110 DriveLib for S7-1200/1500 (FB284, FB285, FB286) — entry 68034568
• SINAMICS STARTER commissioning tool
• SINAMICS StartDrive (TIA Portal)
• Sinamics S110 List Manual (parameter list)
• PROFIdrive profile V4.2 (PNO)

FAQ