2 Description of the safety function STO
Festo – GDCP-CMMS-ST-G2-S1-EN – 1404NH – English 11
2 Description of the safety function STO
2.1 Product overview
2.1.1 Purpose
As processes become increasingly automated, protecting people from potentially hazardous move-
ments is gaining in importance. Functional safety describes required measures by electrical or electron-
ic equipment to reduce or eliminate malfunction-induced dangers. In normal operation, protective
devices prevent human acc ess to hazardous areas. In certain operating modes, during set-up, for ex-
ample, people need to be in hazardous areas. In such situations, the machine operator must be protec-
ted by drive and internal control measures.
The functional safety engineering integrated in the motor controller meets the requirements of the
controller and drive for optimised implementation of protective functions. Planning and installation
complexity is reduced. The use of integrated functional safety engineering increases machine function-
ality and av ailability over the levels achieved by conventional safety technology.
2.1.2 Interfaces
The motor c ontroller CMMS-ST-...-G2 has 2 interfaces for control of the STO safety function.
2
3
1
4
1 Top side of housing
2 I/O interface [ X1]
3 Bottom side of housing
4 STO interface [X3]
Fig. 2.1 Motor controller CMMS-ST-...-G2
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