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Release note Software version 5.25.x

Applicable for e-Series and UR Series

Last modified on Jan 06, 2026

For latest release notes of PolyScope X, please refer to Release note Software version 10.11.x

Date of release: December 16th 2025.

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SW 5.25.0 Release Notes
Release Versions:

  • UR Software Update: 5.25.0
  • URSim Linux: 5.25.0
  • URSim Virtual Machine: 5.25.0 
  • User Manuals: 5.25.0

Key Features

  • Compliance with PROFIsafe standard signals

Safety

PROFIsafe outgoing signals have been inverted for compliance with PROFIsafe standard and general safety standards. This version and all future versions of the software will use active low for PROFIsafe signals (signal value is '0'). Previous versions of PolyScope 5 used active high for PROFIsafe signals (signal value is '1').

Please note that this is a breaking change to all existing field installations of PROFIsafe!

For further details see the User Manual, and the PROFIsafe Update Guide.

URCap Software Platform 

Controller 

  • The Real-Time Data Exchange protocol input interface hardened. The controller is more strictly checking the input data size and will prevent buffer overflows by disconnecting the client. The recipe ID, frequency and string like inputs are sanity checked and rejected if they contain dangerous characters or out of range values. The RTDE receiver now uses an input rate limiter: it allows 10 messages in a burst, but after this it forces a ~2 millisecond pace time between message evaluation.

  • Velocity scale-down. There are some special scenarios when velocity may be scaled down slightly to avoid robot stops. This happens only if a Safety Force Limit setting is above 250 N and the base joint moves with high velocity, while elbow or tool are near the rotation axis of the base joint.

Embedded

  • Improved motion performance at very low speeds (less than 800 µrad/s) and at standstill for shoulder and base joints for UR8L, UR15 and UR18 robots

Bug Fixes 

Controller 

  • Fixed issue in Force mode where user would get Fault C306A003 "Acceleration failed to pass sanity check" when the robot moved into a singularity.

Embedded

  • Reduced the amount of movement allowed during category 2 protective stops, like 3PE stops and safeguard system's stops.

  • OSSD signals on configurable outputs 6 and 7 work as expected, producing “low” pulses of 1 ms

 Known Issues

  • Simulator in some conditions sends additional data packages on RTDE interface.
    If requested frequency is lower than 500Hz then up to 9 additional packages are sent in each communication interval. Issue will be fixed in next bugfix release.
    Workaround #1: set RTDE communication frequency to 500Hz and decimate packages on the receiver side.
    Workaround #2: process only one package in each communication cycle and ignore others.

 

 

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