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3 Function Principle of the Application Example

3.3

Safe torque off STO

3.3.1

The converter with the "Safe Torque Off" (STO) function active prevents the

unwanted startup of machine components. This safety function can be configured

with specific digital inputs for a SINAMICS G120 drive with a control unit with safety

function. To do this, the safety functions must be enabled in the control unit.

Note

A detailed description of the configuration of the safety function STO using digital

inputs can be found in the application example "SINAMICS G: Speed Control of

a G110M / G120 (Startdrive) with S7-1500 (TO) via PROFINET or PROFIBUS

with Safety Integrated (via Terminal) and HMI".

https://support.industry.siemens.com/cs/ww/en/view/78788716

3.3.2

The PM240-2 power modules in sizes FSD, FSE and FSF can be used to realize

the "Safe Torque Off" (STO) according to EN 13849-1 and SIL 3 according to

IEC61508. Two terminal blocks (STO_A and STO_B) and two Dip switches are

available on the front side of the power module.

Note

More information on how to use the STO safety function as per SIL 3 with the

PM240-2 power module can be found in the "SINAMICS G120 power module

PM240-2" manual.

https://support.industry.siemens.com/cs/ww/en/view/109482011

Drehzahlachse mit SINA_SPEED

Entry-ID: 109485727,

V1.0,

06/2017