Bosch Rexroth 21/1F-D IndraDrive Digital Servo Drive | DKC Series

Bosch Rexroth 21/1F-D IndraDrive Digital Servo Drive: Industrial Data Link for Smart Factory Connectivity

The Bosch Rexroth 21/1F-D is a high-performance digital servo drive from the renowned IndraDrive DKC series, engineered to serve as a critical node in the industrial data chain of modern smart factories. Designed for precision motion control and seamless network integration, the 21/1F-D bridges the gap between field-level actuators and upper-level control systems — enabling real-time data exchange across SERCOS, EtherCAT, PROFIBUS, and CANopen architectures. Whether deployed in high-speed packaging lines, CNC machining centers, or automated assembly systems, this drive delivers the communication reliability and protocol flexibility that Industry 4.0 demands.

In a fully connected production environment, the 21/1F-D does not operate in isolation. It functions as an intelligent drive node within a layered automation network, receiving motion commands from Bosch Rexroth IndraControl L series PLCs or third-party Siemens S7-300/S7-400 controllers via SERCOS fiber-optic ring topology. Simultaneously, it feeds back real-time position, velocity, torque, and fault data to SCADA platforms and HMI terminals — including Bosch Rexroth IndraControl VCP series panels — enabling operators to monitor drive health and production throughput without leaving the control room.

Compatibility & Integration Notes

Connected Automation Data Flow

The 21/1F-D sits at the heart of a multi-layer automation data flow. At the field level, rotary encoders, linear scales, and torque sensors feed position and load data directly into the drive’s feedback interface. The drive processes this data in real time, executing motion profiles with microsecond-level precision. Upstream, the Bosch Rexroth IndraControl L45 PLC issues motion commands over a SERCOS III ring, synchronizing the 21/1F-D with adjacent DKC02.3 and DKC11.3 drive nodes on the same motion bus — ensuring coordinated multi-axis operation without timing jitter.

For facilities running mixed-protocol environments, the 21/1F-D’s EtherCAT port enables direct integration with Beckhoff CX series embedded PCs or Omron NJ/NX series machine controllers, eliminating the need for external protocol converters. Remote I/O modules — such as Bosch Rexroth Inline I/O or Phoenix Contact Axioline F — connect to the same EtherCAT segment, extending digital and analog signal collection from distributed field devices back to the central control layer.

At the supervisory level, SCADA systems such as Wonderware InTouch or Ignition by Inductive Automation poll drive parameters — including DC bus voltage, output current, motor temperature, and fault codes — via OPC-UA gateways or PROFIBUS DP master cards installed in the PLC rack. This data pipeline supports real-time dashboards, trend logging, and predictive maintenance algorithms, transforming raw drive telemetry into actionable production intelligence. Bosch Rexroth IndraWorks DS engineering software further enables parameterization, firmware updates, and oscilloscope-level diagnostics over the same network infrastructure, reducing commissioning time and on-site service visits.

For edge computing scenarios, the 21/1F-D’s diagnostic data can be routed through industrial edge gateways — such as the Siemens SINEMA Remote Connect or Moxa EDR-810 industrial router — to cloud-based MES or ERP platforms, enabling remote performance benchmarking and OEE (Overall Equipment Effectiveness) analysis across multiple production sites.

Solving Data Isolation in Industrial Sites

One of the most persistent challenges in legacy manufacturing environments is protocol fragmentation: servo drives, PLCs, remote I/O, and HMI systems from different generations often speak incompatible communication languages, creating data silos that prevent unified monitoring and control. The Bosch Rexroth 21/1F-D directly addresses this by supporting multiple fieldbus protocols within a single hardware platform. A plant running PROFIBUS on its legacy Siemens S5 infrastructure can integrate the 21/1F-D alongside newer EtherCAT segments without replacing existing wiring or controllers — the drive’s multi-protocol firmware handles the translation layer internally.

Remote monitoring is another area where the 21/1F-D delivers measurable value. Traditional servo systems require on-site technicians to connect laptops directly to drive terminals for fault diagnosis. With the 21/1F-D integrated into an EtherCAT or PROFIBUS network, all drive parameters are continuously visible to the SCADA operator from the control room. Fault codes, warning thresholds, and performance trends are logged automatically, enabling predictive maintenance scheduling before unplanned downtime occurs.

Production line transparency is further enhanced by the drive’s support for isochronous real-time communication. In SERCOS III mode, all drives on the ring exchange position and velocity data within a deterministic cycle time — typically 62.5 µs to 4 ms — ensuring that the SCADA historian receives synchronized snapshots of the entire motion system. This level of data granularity supports digital twin modeling, virtual commissioning, and continuous process optimization initiatives that are central to smart factory transformation programs.

System scalability is built into the IndraDrive DKC architecture. As production capacity grows, additional 21/1F-D nodes can be added to the SERCOS ring or EtherCAT segment without reconfiguring the existing network topology. The modular design also supports hot-swap replacement in some configurations, minimizing production interruption during maintenance windows.

Industrial Connectivity FAQ

Q1: What communication protocols does the Bosch Rexroth 21/1F-D support, and is it compatible with third-party PLCs?
The 21/1F-D supports SERCOS II/III, EtherCAT, PROFIBUS DP, and CANopen, making it compatible with a wide range of PLC platforms including Siemens SIMATIC S7, Beckhoff TwinCAT, Omron Sysmac, and Mitsubishi MELSEC series. Protocol-specific firmware options are available to match your existing network architecture.

Q2: How does the 21/1F-D ensure network stability in high-speed motion applications?
The drive uses isochronous real-time communication over SERCOS III or EtherCAT, with deterministic cycle times as low as 62.5 µs. Built-in watchdog timers and redundant feedback monitoring ensure that any communication interruption triggers a controlled stop sequence, protecting both the machine and the workpiece.

Q3: Can the 21/1F-D be diagnosed and parameterized remotely without on-site access?
Yes. When integrated into an EtherCAT or PROFIBUS network connected to an OPC-UA gateway or industrial router, all drive parameters — including fault history, motor temperature, and current load — are accessible remotely via SCADA or Bosch Rexroth IndraWorks DS software. This supports remote commissioning, firmware updates, and predictive maintenance without dispatching a field technician.

Q4: What does the warranty terms confirmed during quotation cover, and has the unit been tested before shipment?
Every Bosch Rexroth 21/1F-D unit supplied by ZYPLC undergoes pre-shipment functional testing to verify communication interface integrity, power stage operation, and firmware version compatibility. The warranty terms confirmed during quotation covers manufacturing defects and component failures under normal operating conditions. Availability is confirmed via RFQ for shipment arranged after confirmation, with full traceability documentation provided upon request.