The EtherCAT Master is the central controller of the entire EtherCAT network and the only device that actively initiates communication. It organizes data flow, manages device status, and ensures precise synchronization across all slave devices.
Its core responsibilities include:
The master generates and transmits EtherCAT frames.
Each slave reads/writes its assigned data section as the frame passes through.
Once the frame returns to the master, the master processes all input data and delivers it to the upper-layer application.
The master provides the global clock for the EtherCAT network.
Through the Distributed Clocks (DC) mechanism, it aligns all slave clocks.
Enables nanosecond-level synchronization across hundreds or thousands of devices.
The master defines and manages the PDO mapping table.
It maps all slave input/output data into designated memory locations.
For user applications, reading/writing process data becomes as simple as accessing local memory.
The master handles the standard EtherCAT network state transitions:
Init → Pre-Operational → Safe-Operational → Operational
Cyclic process data communication is only possible in the Operational state.
The master reads each slave’s ESI file to identify device type and capabilities.
Automatically configures Distributed Clocks, Sync Managers, and FMMU.
Continuously monitors network health and diagnoses issues such as slave loss, communication timeout, and watchdog errors.
Currently, the main IGH EtherCAT Master versions include:
1.6.8 (latest stable version)
1.5.2 (most widely used)
ARM XY supports both versions and can be ported to any other versions as required.
The following example uses a pre-cross-compiled 1.6.8 master.
Taking the TI Sitara AM62x platform BL350 series as an example:
With IGH EtherCAT Master, ARMxy provides:
High real-time performance (RT-Linux + EtherCAT)
Nanosecond-level multi-axis synchronization
Efficient PDO memory mapping
Industrial-grade reliability
Ideal for robotics, motion control, PLC systems, servo control, and automation equipment
