2 Description of the safety function STO
Festo – GDCP-CMMS-AS-G2-S1-EN – 1306NH – 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. F unctional safety describes required measures by electrical or electron-
ic equipment to reduce or eliminate malfunction-induced dangers. In normal operation, protective
devices prevent human access 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 technology integrated in the motor c ontroller meets the requirements of the con-
troller and drive for optimised realisation of protective functions. Planning and installation complexity is
reduced. The use of integrated functional safety technology increases machine functionality and avail-
ability over the levels achieved by conventional safety technology.
2.1.2 Interfaces
The motor controller CMMS-A S -...-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 c ontroller CMMS-AS-...-G2
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