SEW EURODRIVE DFP21B bus interface

SEW DFP21B PROFIBUS DP-V1 Fieldbus Interface: Complete Guide to Installation, Configuration, and Communication

In modern industrial automation systems, fieldbus technology is the core for achieving efficient data exchange between controllers and drive devices. PROFIBUS DP, as one of the most widely used fieldbuses globally, holds an important position in manufacturing and process industries due to its high speed, determinacy, and openness. The DFP21B tab of SEW-EURODRIVE is MOVIDRIVE ®  MDX61B frequency converter MOVITRAC ®  The B frequency converter and UOH11B gateway housing provide PROFIBUS DP-V1 interface, supporting efficient transmission of cyclic process data and non cyclic parameter data. This article is based on the official manual and systematically explains the installation steps, hardware configuration, project planning, GSD file usage, and 8-byte MOVILINK of DFP21B ®  Provide a complete technical operation guide for automation engineers, including parameter channels, DP-V1 functions, communication examples, and fault diagnosis.

Product Overview and Functional Features

1.1 Application scenarios of DFP21B tab

DFP21B is SEW designed specifically for MOVIDRIVE ®  MDX61B (expandable option version) and MOVITRAC ®  The PROFIBUS DP-V1 fieldbus interface designed for B-series frequency converters. It enables the frequency converter to seamlessly integrate into the PROFIBUS network, achieving:

Real time control (speed, torque, start stop, etc.) through cyclic process data (up to 10 words)

Through a non cyclic parameter channel (8-byte MOVILINK) ®  Or PROFIdrive dataset 47) Read and write all driver parameters

Supports parallel communication between C1 main station (PLC) and C2 main station (diagnostic/visualization equipment) of DP-V1

Through MOVITOOLS ®  MotionStudio conducts remote debugging and diagnosis via PROFIBUS

1.2 Core Features

Unit Profile: Whether using PROFIBUS, DeviceNet, or other buses, the control interface is the same, making it easy to change bus types.

Coexistence of cyclic and non cyclic data: Process data (PD) is periodically exchanged, and parameter data is transmitted non periodically through READ/WRITE services, without affecting the bus cyclic load.

Hardware address setting: The station address is set through DIP switches (1-125), without software configuration, and can be used immediately upon power on.

Monitoring function: Supports fieldbus timeout response, can be configured as quick stop, emergency stop, or maintain the last set value.

Diagnostic function: Integrated fieldbus monitor, compatible with MOVITOOLS ®  View process data and status information.

1.3 Supported Devices

Equipment Description

MOVIDRIVE ®  MDX61B needs to be plugged into a fieldbus slot and supports DFP21B as a DP-V1 slave station

MOVITRAC ®  B uses DFP21B as a gateway to connect the frequency converter on SBus

UOH11B gateway shell independent shell, built-in DFP21B, used to connect multiple SBus devices to PROFIBUS

Installation and wiring

2.1 In MOVIDRIVE ®  Install DFP21B in MDX61B

Important limitations:

MOVIDRIVE size 0 ®  MDX61B can only be installed or removed by SEW engineers with option cards.

Users with sizes 1-6 can operate it themselves.

Installation steps (refer to Figure 2 in the manual):

Disconnect the power supply of the frequency converter and the DC 24V power supply.

Take ESD protection measures (such as anti-static wristbands).

Remove the keyboard and front cover.

Loosen the two screws securing the card holder and pull out the holder evenly.

Remove the two screws from the black cover plate and remove the cover plate.

Place the DFP21B tab on the bracket so that the three positioning screws correspond to the bracket holes.

Push the bracket with the card into the slot, apply slight pressure to engage the connector, and tighten the two fixing screws.

Reinstall the front cover and keyboard.

2.2 In MOVITRAC ®  Install DFP21B (gateway mode) in B

MOVITRAC ®  The installation of option cards for B is also limited to SEW engineers only. DFP21B must be installed at the beginning or end of the SBus connection and have a built-in SBus terminal resistor (S1=ON). Its SBus address is fixed at 0.

SBus wiring (Figure 3):

Use twisted pair shielded copper cable (0.75 mm ²/AWG18120 Ω @ 1 MHz, capacitance ≤ 40 pF/m).

Connect X26 terminals: SC11 (SBus+), SC12 (SBus -), GND.

DC 24V power can be provided to DFP21B through X26.7 (if MOVITRAC ®  X12.8/9 has been powered.

Terminal resistance: The SBus end needs to be connected with S1=ON, and the intermediate station S1=OFF.

Baud rate and bus length:

250 kbaud → 160 m

500 kbaud → 80 m

1000 kbaud → 40 m

2.3 UOH11B Gateway Shell

UOH11B is a standalone gateway enclosure that includes the DFP21B tab. It is connected to SBus through X26 terminals (SC11, SC12, GND, DC 24V) and to PROFIBUS through a 9-pin Sub-D plug. This casing is suitable for handling multiple MOVITRAC ®  B or other SBus devices are centrally connected to the PROFIBUS network.

2.4 PROFIBUS Connection and Pin Allocation

The PROFIBUS interface of DFP21B adopts a 9-pin Sub-D socket (compliant with IEC 61158), with pin definitions: