Configuring SIMODRIVE 611U PROFIBUS Control with S7-300

1. Overview

The SIMODRIVE 611 universal (order code 6SN1118-1NH01-0AA1) is a high-dynamic AC drive converter for spindle and servo applications. When equipped with the PROFIBUS-DP option module, the drive integrates into a SIMATIC S7-300 DP network as a slave and is cyclically controlled from a CPU 314-2DP master. This reference covers the complete integration path from hardware selection and GSD installation through STEP 7 configuration, the UDT30008 process-data structure, the SIMODRIVE_CONTROL FC wrapper, and the optional FB83 basic positioner used to drive the integrated Z1 traversing blocks.

The drive is documented as a PROFIBUS-DP slave in the official product finder entry SIMODRIVE 611 universal with PROFIBUS-DP, where it is listed as a slave device supporting 12 Mbps operation and up to 16 process-data words per direction. It remains a commonly encountered node in retrofit projects where S7-300 masters replace obsolete S5-95U analog interfaces on existing 1FT5 / 1FK6 machine axes.

2. Prerequisites

2.1 Hardware Components

• SIMODRIVE 611 universal NE module — order code 6SN1118-1NH01-0AA1 (Speed/Torque setpoint + Positioning firmware).
• 611U PROFIBUS option card installed in option slot of the NE module. The option card exposes a 9-pin SUB-D PROFIBUS connector on the front of the drive.
• Servo motor compatible with the NE firmware: 1FT5 / 1FT6 (synchronous servos), 1FK6, or 1PH7 (asynchronous spindle motor).
• Feedback: resolver (standard), incremental encoder, or multi-turn absolute encoder (EnDat) terminated on the NE module X411/X412 connector.
• SIMATIC S7-300 CPU 314-2DP — typical order codes 6ES7314-6BF00-0AB0 or 6ES7314-6CG03-0AB0. The integrated DP master interface (MPI/DP, X2) is used for PROFIBUS.
• PROFIBUS DP cable (violet, two shielded cores) with PROFIBUS connectors that include an integrated terminating resistor switchable ON / OFF.
• 24 V DC load supply for the 611U NE module electronics and for the S7-300 CPU / IM / SM.

2.2 Software Components

• STEP 7 V5.4 SP5 or V5.5 SPx with HW Config.
• SIMODRIVE 611U Toolbox DVD (contains the sample project with FB83, the SIMODRIVE_CONTROL FC, UDT30008, and the SiKo / Z1 traversing block example).
• Siemens generic GSD file for 611U — typically SI08118.GSD — copied into \Siemens\Step7\S7DATA\GSD before opening HW Config.
• SimoCom U commissioning tool (RS232 service port on the NE module) for firmware-side parameter assignment, or DriveMonitor for diagnostic online access.

2.3 Reference Topology

The reference topology is a single-master / single-slave DP segment:

• CPU 314-2DP DP master port (X2) → PROFIBUS cable → 611U PROFIBUS option card (slave address, e.g., 3).
• Baud rate 1.5 Mbps or 12 Mbps (611U PROFIBUS option supports both; the segment must be configured to the lowest common denominator if additional slaves are added).
• Terminating resistors ON at the CPU connector and at the last drive on the segment.

3. PROFIBUS Slave Configuration on the 611U

Before any STEP 7 work, the drive-side PROFIBUS node address must be set on the NE module. This is performed with the SimoCom U tool or with the keys on the NE module front panel:

1. Power up the 611U NE module; the 7-segment display shows the current node address (default 3).
2. Navigate parameter P0918 (PROFIBUS node address). Allowed values: 1–125, must be unique on the segment.
3. Save and cycle the 24 V control supply to apply the new address.
4. Set P0922 = telegram selection for PROFIBUS. For positioning applications use P0922 = 3 (10/10 PZD) or P0922 = 102 for Siemens standard telegram 102 (free PZD layout).
5. Set P0925 = number of PKW parameter-channel words (typically 0 — parameter access is via SimoCom U, not via PKW).

4. STEP 7 Project and HW Config

4.1 Install the GSD File

1. Copy SI08118.GSD and the accompanying bitmap file (SI08118.BMP or SIEM8118.BMP) into \Siemens\Step7\S7DATA\GSD.
2. In HW Config choose Options → Install GSD File… and select the file.
3. Restart HW Config so the new device appears under PROFIBUS-DP → Additional Field Devices → Drives → SIMODRIVE.

4.2 Build the Hardware Configuration

1. Insert a SIMATIC 300 station and place the CPU 314-2DP on rack 0 slot 2.
2. Double-click the DP master port (X2) of the CPU; set the master mode and assign a baud rate (1.5 Mbps recommended for the 611U at first commissioning).
3. Drag the SIMODRIVE 611U slave from the catalog to the DP master system. Configure its PROFIBUS address to match P0918.
4. In the slave's slot configuration, insert a PZD module that matches the telegram you selected in P0922. For 10/10 PZD choose the “PZD 10/10” module (universal module, free assignment). The system assigns I/O addresses that must be respected by the PLC program — the reference project uses LADDR 256 (input) and 256 (output) as a single combined slot.
5. Compile and download the hardware configuration (HW Config → Station → Save and Compile → PLC → Download).

4.3 Reference Address Map

The exact byte offset depends on how HW Config places the modules. The reference program stores all process data inside a single instance DB (DB72) starting at offset 156; the offsets below describe that layout and are used by the source program verbatim.

5. UDT30008 Process-Data Layout

The Toolbox defines a user-defined data type UDT30008 that mirrors the PZD layout of the 611U positioning firmware. The reference instance uses one DB per axis — the example uses DB72 for axis 1 (the parameter NR_ACHS_DB := 72 identifies which DB the FC operates on when multiple axes are mapped).

The instance DB layout (all offsets in bytes, base offset 156 = DBX156.0):

The reference offsets are exactly those given in the original example:

• Initial UDT30008 address = 156
• Write: 156 + 10 = 166 — start of the 10-word PZD output block
• Read: 156 + 50 = 206 — start of the 10-word PZD input block (50-word offset from the base)

The 20-byte length (BYTE 20) declared on WR_PZD and RD_PZD covers exactly 10 process-data words per direction.

6. SIMODRIVE_CONTROL FC Call Interface

The Toolbox SIMODRIVE_CONTROL FC is the standard wrapper that handles cyclic DP-V0 read/write of the PZD block. It encapsulates SFC14 / SFC15 (DPRD_DAT / DPWR_DAT) and applies the life-sign handshake required by the 611U positioning firmware.

The reference call is:

CALL "SIMODRIVE_CONTROL" , "Z1DB"
    NR_ACHS_DB   := 72
    LADDR        := 256
    WR_PZD       := P#DB72.DBX166.0 BYTE 20
    RD_PZD       := P#DB72.DBX206.0 BYTE 20
    enable_SFC_PZD:= TRUE

Internally SIMODRIVE_CONTROL builds the DPRD_DAT / DPWR_DAT request as:

CALL "DPRD_DAT"
    LADDR  := 256
    RET_VAL:= MW100
    RECORD := P#DB72.DBX206.0 BYTE 20   // PZD in

CALL "DPWR_DAT"
    LADDR  := 256
    RET_VAL:= MW102
    RECORD := P#DB72.DBX166.0 BYTE 20   // PZD out

7. Control and Status Word Mapping

The first PZD out / PZD in word of the 611U positioning telegram always carries the Siemens standard control word 1 (STW1) and status word 1 (ZSW1). The reference assignment is documented in the Toolbox manual:

Bits 12..15 of STW1 and ZSW1 are the four-bit life-sign counter that the FC toggles and checks each cycle. If the drive does not see the counter change within the configured watchdog window (P0865), the drive drops to a fault state and reports F082.

8. FB83 Basic Positioner

The 611U positioning firmware exposes a set of Z1 traversing blocks (64 motion profiles stored in the drive). Each block defines target position, velocity, acceleration, deceleration, and blending mode. FB83 is the STEP 7 block that converts high-level HMI / PLC commands (start block N, stop, continue, reference, set home) into the STW1 / STW2 sequence expected by the drive, and decodes ZSW1 / ZSW2 into a status word exposed back to the PLC.

The block is delivered inside the Toolbox STEP 7 sample project. Typical instance data block layout (DB71 in the reference) maps as:

The SIMODRIVE_CONTROL FC and FB83 operate on the same DB (DB72 in the reference) so that the FB83 status bits are derived directly from the PZD input words updated by the FC.

9. 1FT5 Motor Considerations

The 1FT5 motor family is a synchronous servo motor with resolver feedback and is fully supported by the 611U NE module firmware. The PROFIBUS communication path between CPU 314-2DP and the 611U is independent of the motor type: the same telegram, the same GSD, and the same FB83 work for a 1FT5, 1FT6, 1FK6, or 1PH7 motor. The difference is on the drive side, where the motor code must be entered into P1101 .. P1106 so that the controller knows the resolver pole count and the motor torque constant.

10. Commissioning Procedure

1. Power up the S7-300 with CPU 314-2DP. Confirm the SF / BF LEDs on the CPU are off after download.
2. Power up the 611U NE module. The 7-segment shows --, then the node address.
3. Connect SimoCom U over RS232 to set P0918, P0922, P0865 (PROFIBUS watchdog, default 50 ms), and the motor parameters P1101 .. P1106.
4. Verify PROFIBUS LED on the option card goes from flashing to steady green after STEP 7 enters RUN.
5. In STEP 7 force STW1 = 16#047E (OFF1 = 1, OFF2 = 1, OFF3 = 1, inverter enable = 0, control by PLC = 1). Confirm ZSW1 = 16#0631 (ready, ready to operate, switch-on inhibited).
6. Apply STW1 = 16#047F to enable the inverter. ZSW1 must transition to 16#0237 (operation enabled, no fault).
7. Test jog via STW1 bit 8 = 1, bit 9 = 0 (positive jog) and verify actual speed in PZD_in[2] tracks the jog setpoint.
8. Stop via STW1 = 16#047E, then run a Z1 traversing block by selecting the block number in PZD_out[3] and asserting the start command via FB83.
9. Monitor ZSW1 bit 10 (f / n reached) and the InPosition flag from FB83.

11. Verification Checklist

• STEP 7 online diagnostics show the 611U slave in cyclic data exchange (no DIAG interrupt pending).
• DPRD_DAT RET_VAL = 0 and DPWR_DAT RET_VAL = 0 every cycle.
• ZSW1 bit 10 toggles in sync with the life-sign counter echo in ZSW1 bits 12..15.
• Actual speed in PZD_in[2] (word 2 of PZD in) tracks setpoint speed in PZD_out[2] within the configured ramp.
• Drive does not report F082 (life-sign failure) or F080 (bus timeout).
• FB83 status flags AxisReady / InPosition reflect the actual drive state within one PROFIBUS cycle.

12. Troubleshooting Matrix

13. Diagnostic Information Sources

Three sources of diagnostic data should be used during commissioning:

1. STEP 7 online → Accessible Nodes → slave → Module Information — shows DIAG bytes and module status.
2. SimoCom U online → Diagnostics → PROFIBUS — shows telegram length, node address, baud rate detected, and DP state.
3. FB83 status outputs (AxisFaulted, FaultWord, ZSW1) exposed back into the PLC program and to the HMI.

Drive-internal fault numbers are documented in the 611U List Manual. The most common faults when migrating an axis from analog control to PROFIBUS are F080 (bus failure), F082 (life-sign failure), and F047 (following error). All three are recoverable once the underlying bus problem or tuning problem is fixed.

14. Replacement of Legacy S5-95U Analog Wiring

Projects upgrading from S5-95U to S7-300 / CPU 314-2DP typically keep the 611U hardware and 1FT5 motor unchanged. The replacement steps are:

1. Disconnect the ±10 V analog setpoint wires from X461 of the 611U NE module.
2. Disconnect the encoder simulation cables from X471 (if previously routed into the S5-95U counter input).
3. Install the PROFIBUS option card in the 611U option slot; connect PROFIBUS cable to the 9-pin SUB-D on the card.
4. Configure P0918, P0922, P0865 via SimoCom U.
5. Load the Toolbox project into STEP 7, adjust LADDR / NR_ACHS_DB to match the new hardware configuration, and download.
6. Verify the axis behaves identically to the analog configuration by running a reference motion profile.

The motor power wiring, the braking resistor, the line filter, and the mains contactor wiring remain unchanged. Only the control-side signal path is replaced.