Festo CMMP-AS M0 Series, Руководство пользователя

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16 Festo — CMMP-AS-...-M0 — 2022-07c
Description of the safety function STO
Function Reaction time Reaction
Switching time from
high to low T_STO-A/B_OFF è 8.1.3 Electrical data [X40], è Tab. 19 Tech-
nical data: electrical data of the STO-A and STO-B
inputs
Switching time from
low to high T_STO-A/B_ON
Detection of failure
Driver power supply t
Reaction
£
125 μs Control of the power semiconductors (PWM) is
switched off
Activate holding brake t
Reaction
£
10 ms Actuation of the holding brake after detecting the
failure of the driver power supply
Signal evaluation and
status indicator t
Reaction
£ 10 ms Status transitions in the internal status machine,
triggering of an error message if necessary and
showing the status on the display
Tab. 5: Driver supply voltage acquisition and reaction times
3.4 Time response
The STO-A and STO-B inputs are functionally absolutely equivalent, therefore the switching sequence
of STO-A/STO-B is interchangeable in all diagrams.
3.4.1 STO basic time response
The figure below shows the basic time response of the integrated safety circuit. The times can be
found in the table below.
Fig. 3: Basic time response when activating and deactivating the STO safety function