deenIntegrated Motion

SOMANET Safe Motion

Synapticon > Technology > SOMANET Safe Motion


The SOMANET Safe Motion option provides a broad range of SIL3 PLe certified Safety and Safe Motion features over Fail Safe over EtherCAT (FSoE) and fits all SOMANET servo drives. Never before a servo drive platform in the extra low voltage range provided such a spectrum of features at such safety performance level.

The SOMANET Safe Motion option card is physically mounted between the Processor Module and Drive Module. This enables the Safety extension to supervise, generate and receive safety critical signals without the necessity to change the existing hardware or introduce complex wiring to the solution. The SOMANET Safe Motion provides Safety Functions such as STO, SBC, SS1, SS2, SLS, SLP, SLT, which are all available via FSoE or I/O.

Integrating the safety functionality directly into drives has several benefits:

Less wiring – No need for long encoder cables through the entire robot arm. Traditional safety components like contactors can be removed

Fast response – offload safety handling from Safety PLC to individual drives

Faster power cycles – safe modes possible without removing high power to drive

Increased productivity – access machine in safety mode without shutting down completely

Cost saving – compared to traditional safety solutions


Use cases that greatly benefit from the possibilities provided by SOMANET Safe Motion

Robot Arms

Increasing demand for Human-Robot-Collaboration calls for a new level of intrinsic functional safety of robot arms. Limited factory space benefits from advanced safety concepts, as robot cages can be avoided.

Autonomous Guided Vehicles

Autonomous mobile logistics experience a tremendous growth. In factory environments, where humans and mobile robots move alongside each other, advanced functional safety is key.

Industrial Machines

Interrupting production for machine maintenance can be very expensive. Safe motion control enables system designs that support interruption-free maintenance operations, benefiting total cost of ownership.


Safety functions provided by SOMANET Safe Motion in accordance with IEC 61800-5-2

STO - Safe Torque Off

Prevents the drive from unplanned restarting. This state is monitored internally in the drive. STO enables safe working and has a wide range of use with moving axes.

SBC - Safe Brake Control

Permits the safe control of a holding brake. The function is always activated in parallel with STO. The SBC function is used in conjunction with the functions STO or SS1 to prevent the movement of an axis in the torque-free state.

SBT - Safe Brake Test

Identifies wear or faults in the brakes. By regular automated brake tests, the safety and availability of machines can be increased and maintenance costs lowered. Functions must be implemented inside safety controller using safe process data.

SS1 - Safe Stop

The SS1 function causes a motor to stop rapidly and safely and causes a standstill. SS1 is often used in press applications or on any application with larger loads.

SS2 - Safe Stop

The SS2 function shuts down a motor quickly and safely. When the motor is at standstill, a safe operating stop (SOS) is triggered. This function can be used in a vertical axis or any application where maintaining position synchronisation is critical.

SLS - Safely Limited Speed

Ensures that the drive does not exceed a defined speed limit. The speed is reliably monitored a defined fault response is activated if the set speed limit is exceeded. SLS is used if people are in the danger zone of a machine.

SLP - Safely Limited Position

To ensure that the axis remains within the permissible traversing range,  SLP monitors the axis. SLP is used for applications in which machine operators have to enter a protection area, for example stacker or gentry cranes. Functions must be implemented inside safety controller using safe process data.

SP - Safe Position

Communicates the current actual position values to the safety control. The function is particularly suitable for machines where flexible safety functions are required.

SLT - Safely Limited Torque

The motor current is proportional to the motor’s torque, so the hazard from movement is limited. SLT is essential for the growing application of collaborative robotics. Functions must be implemented inside safety controller using safe process data.

ST - Safe Torque

Communicates the current actual torque values to the safety control. The function is particularly suitable for robotic force control and multi-axis impedance control applications.

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