Festo CMMP-AS-Series-M0-STO, Manual

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2 Description of the safety function STO
Festo – GDCP-CMMP-AS-M0-S1-EN – 1412a – English 17
2.4 Time behaviour
Functionally, the STO-A and STO-B inputs are identical. The switch sequence of
STO-A/STO-B is interchangeable across all diagrams.
2.4.1 Basic time behaviour STO
Fig. 2.3 displays the basic time behaviour of the integrated protection circuit. The time specifications
can be found in table Tab. 2.3.
STO-A
Status C1/C2
STO-B
[X40]
Closed
Open
1
0
CMMP-AS-…-M0
Display
“Safety status”
(internal)
1
0
T_STO-A/B_OFF
T_C1/C2_ON
T_DRIVE_V

T_STO-A/B_OFF + 10 ms
“H” – STO reached
Dependent on the
operating status
STO
requested
STO reached “Standard” “Standard”
T_C1/C2_OFF
T_STO-A/B_ON
T_DRIVE_V

T_STO-A/B_ON + 10 ms
Dependent on the
operating status
STO
requested
STO - “Safe torque off ” active
Fig. 2.3 Basic time behaviour when activating and deactivating the safety function STO
Time Description Value
T_STO-A/B_OFF STO-A/B – Switching time from High to Low
è
Section A.1.3, Tab. A.5
T_STO-A/B_ON STO-A/B – Switching time from Low to High
è
Section A.1.3, Tab. A.5
T_C1/C2_ON C1/2 – Switching time closing
è
Section A.1.3, Tab. A.7
T_C1/C2_OFF C1/2 – Switching time opening
è
Section A.1.3, Tab. A.7
T_DRIVE_V Deceleration of the CMMP-AS-...-M0 0 … 10 ms
Tab. 2.3 Time specifications to Fig. 2.3