Function Manual · Publication A5E34261271 · Siemens AG

Safety Integrated: SINAMICS G115D, G120, G120C, G120D

This function manual covers the Safety Integrated functions for the SINAMICS G115D, G120, G120C, and G120D variable-speed drive converters. It describes drive-integrated safety functions including STO, SBC, SS1, SLS, SDI, and SSM, and explains how to select them via failsafe digital inputs or PROFIsafe. The manual addresses installation wiring, commissioning procedures, acceptance tests, system properties, and applicable standards. It is written for machine manufacturers, plant construction companies, commissioning engineers, and service personnel.

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07/2025 Edition
V4.7 SP14 Firmware Version
STO, SBC, SS1, SLS, SD… Safety Functions Covered
SINAMICS G115D, G120, … Covered Drive Families

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Specifications

Safety Functions by Converter (Table 3-1)

SINAMICS G115D STO with all product versions; SLS with all product versions; SLS with switchable SLS levels with the PROFINET variant
SINAMICS G120C STO with all product versions
SINAMICS G120, STO With CU240E-2, CU250S-2 and CU230P-2 Control Units (CU230P-2 with PM240-2 FSD to FSG, PM240P-2 FSD to FSF or PM330)
SINAMICS G120, SS1 and SBC (basic) With all CU250S-2 Control Units
SINAMICS G120, extended functions CU240E-2 F, CU240E-2 DP-F, CU240E-2 PN-F and CU250S-2 variants (CU250S-2 requires a license)
SINAMICS G120D STO with all Control Units; extended functions with CU240D-2 DP-F, CU240D-2 PN-F, CU250D-2 DP-F, CU250D-2 PN-F (incl. PP and FO versions)

Interfaces to Select the Safety Functions

SINAMICS G115D 1 F-DI; PROFIsafe telegram 30, telegram 900
SINAMICS G120C DP / PN 1 F-DI; PROFIsafe telegram 30, telegram 900
G120 with CU240E-2 F 3 + 1 F-DI; no PROFIsafe
G120 with CU240E-2 DP-F / PN-F 3 + 1 F-DI; PROFIsafe telegram 30, telegram 900
G120 with CU250S-2 / CU250S-2 CAN 3 + 1 F-DI; 1 F-DO; safe brake control with Safe Brake Relay
G120 with CU250S-2 DP / PN 3 + 1 F-DI; 1 F-DO; PROFIsafe telegram 30, telegram 900; Safe Brake Relay
G120D with CU240D-2 DP-F / PN-F, CU250D-2 DP-F / PN-F 3 F-DI; 1 F-DO; PROFIsafe telegram 30, telegram 900

PROFIsafe Telegrams

Telegram 30 S_STW1 / S_ZSW1: control and status signals for the safety functions
Telegram 900 Function as for telegram 30, plus feedback of the F-DI status (S_STW5 / S_ZSW5)

Safety Certification Levels

STO via PM240-2 / PM240P-2 Power Module terminals (FSD to FSF) Category 3, PL e (EN ISO 13849-1:2015), SIL 3 (IEC 61508:2010)
All other safety functions of G115D, G120, G120C and G120D Category 3, PL d (EN ISO 13849-1:2015), SIL 2 (IEC 61508:2010)

Communication Protocols

Supported industrial networks and field buses for the products covered by this publication.

PROFIsafe via PROFINET Used for safety-related communication between F-CPU and converter; supports Telegram 30 and Telegram 900 PROFIsafe via PROFIBUS Alternative fieldbus for PROFIsafe connection to failsafe controller (F-CPU) Failsafe Digital Inputs (F-DI) Two-channel wiring for selecting the safety functions

Certifications & Compliance

Category 3 / PL e, SIL 3: STO via PM240-2 or PM240P-2 Power Module terminals Category 3 / PL d, SIL 2: all other safety functions EC type-examination certificate per firmware version (EN ISO 13849-1, IEC 61508) EC Declaration of Conformity

Document Contents

Full PDF covers the following topics in detail:

  • Changes in the current edition
  • Fundamental safety instructions
  • Introduction
  • Description
  • Installing
  • Commissioning
  • Operation
  • Corrective maintenance
  • System properties
  • Appendix

Frequently Asked Questions

Which safety functions are available as basic functions on SINAMICS G120 converters?
The basic functions available are Safe Torque Off (STO), Safe Brake Control (SBC), and Safe Stop 1 (SS1) without speed monitoring. STO is available on every converter family covered. SBC and SS1 are available with CU250S-2 Control Units. Each converter described in the manual has one or several of the basic functions.
What extended safety functions does SINAMICS G120 support and what hardware is required?
Extended functions include SS1 with speed monitoring, Safely Limited Speed (SLS), Safe Direction (SDI), and Safe Speed Monitor (SSM). These functions require a Control Unit with an "F" designation, such as CU240E-2 F, CU240E-2 DP-F, CU240E-2 PN-F, or CU250S-2 variants. For SINAMICS G120 with a CU250S-2 Control Unit, a license is also required for the extended functions.
How can safety functions be selected on SINAMICS G120 converters?
Safety functions can be selected via failsafe digital inputs (F-DI) using two-channel wiring, or via PROFIsafe secure fieldbus communication over PROFINET or PROFIBUS. A failsafe digital output (F-DO) is also available on certain Control Units. PROFIsafe uses Telegram 30 or Telegram 900, where Telegram 900 additionally feeds back the status of the failsafe digital inputs.
Is an encoder required to use the Safety Integrated functions?
No. The safety functions integrated in the drive do not use an encoder. The functions operate without an encoder for actual value sensing. If an encoder is connected for closed-loop motor control, the safety functions ignore the encoder signal and use encoderless actual value sensing.
What applications are not permitted when using encoderless safety functions?
Encoderless safety functions must not be used in applications involving pulling loads, such as hoisting gear, elevators, and unwinders. The encoderless actual value sensing cannot identify whether a pulling load undesirably accelerates the drive due to a fault in the closed-loop motor control. For such applications, a drive with encoder-based safety functions (e.g. SINAMICS S120) or speed monitoring in the higher-level control system should be used instead.
What is the difference between EMERGENCY STOP and EMERGENCY OFF, and which safety functions apply?
EMERGENCY OFF minimizes the risk of electric shock by switching off the power supply, while EMERGENCY STOP minimizes the risk of unexpected motion. STO and SS1 are only suitable for implementing EMERGENCY STOP. STO corresponds to Stop Category 0 and SS1 corresponds to Stop Category 1. STO and SS1 are not suitable for switching off an electrical voltage and cannot replace EMERGENCY OFF.
What certifications apply to the SINAMICS G120 Safety Integrated functions?
For STO via the terminals of the PM240-2 and PM240P-2 Power Modules, the level is Category 3 / PL e to EN ISO 13849-1 and SIL 3 to IEC 61508. All other safety functions of the G115D, G120, G120C and G120D are Category 3 / PL d and SIL 2. A test institute certifies each released firmware version with an EC type-examination certificate.

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