SINUMERIK 840D sl Safety Integrated

SINUMERIK Safety Integrated is a comprehensive safety package that helps to protect people as well as machines – and which is very efficient and economical thanks to the complete integration of the safety functions in the control and drive technology. Moreover, these functions make your machine safe and practical to operate under all required operating conditions. For example, in setup and test operation while the protective door is open. The safety functions meet the requirements of DIN EN 61508 for use up to and including SIL 2 (Safety Integrity Level), and Category 3, and PL d (Performance Level) according to DIN EN ISO 13849. This allows the main requirements for functional safety to be implemented simply and economically.

Included in the functional scope (e.g.):

  • Functions for safely monitoring speed and standstill

  • Functions for establishing safe boundaries in work spaces and protected spaces, and for range recognition

  • Direct connection of all safety-related signals and their internal logic combination

  • Safe braking management

Product features:

  • Functions for personnel and machine protection

  • Short response times

  • Can be used in all operating modes

  • Replaces external electromechanical devices


The safety functions are available in all modes and can communicate with the process using safety-oriented input/output signals. They can be implemented for each individual axis and spindle. The following Safety Integrated functions are available:

Safety Integrated basic function

▪ Safe pulse cancellation of the drive
▪ Safe control of a holding brake
▪ Safe shutdown of a drive

System-integrated safety functions

▪ Safe monitoring of the speed
▪ Safe monitoring of the speed and position.
▪ Safe processing of the sensors and actuators

More information about the functions is provided under:

Customer benefits

  • High level of security:
    Complete implementation of the safety functions in SIL 2 / PL d

  • High level of flexibility:
    Supports the implementation of practically sound safety and operating concepts

  • High degree of cost effectiveness:
    Reduction of the hardware and installation costs

  • High level of availability:
    Lack of electromechanical switching elements sensitive to interference

Further information

Quick and easy evaluation of safety functions

The Safety Evaluation Tool for the standards IEC 62061 and ISO 13849-1 gets you straight to your goal. This TÜV-tested online tool from the Siemens Safety Integrated program helps you to evaluate the safety functions of your machine quickly and reliably. You will be provided with a standard-compliant report that can be integrated into the machine documentation as a safety verification.

Safety Integrated - quickly and simple to a safe machine