2
Description of the safety function STO
10
Festo – GDCP-CMMP-AS-M0-S1-EN – 1412a – English
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 the measures offered by electrical or elec
tronic devices that are required to reduce or eliminate malfunction-induced hazards. In normal opera
tion, safety devices prevent human intervention in hazardous areas. In certain operating modes, during
set-up for example, people also need to be in hazardous areas. In such situations, the machine operat
or must be protected by drive and internal control measures.
The functional safety technology integrated in the motor controller provides the conditions required by
the controller and drive for optimised realisation of the safety functions. Planning and installation com
plexity is reduced. The use of integrated functional safety technology increases machine functionality
and availability over the levels achieved by conventional safety technology.
2.1.2
Interface
The CMMP-AS-...-M0 motor controller is equipped with a digital I/O interface [X40] for control of the
STO safety function.
2
3
1
0 V
24 V
C2
C1
0V-B
STO-B
0V-A
STO-A
1
Motor controller CMMP-AS-…-M0
2
Digital I/O interface [X40] for control of the
STO function
3
Pin 1 of the interface [X40]
Fig. 2.1
Motor controller CMMP-AS-...-M0
