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Description of the safety function STO
The tolerance to test pulses from sensors with OSSD signals depends on the operating range
è Tab. 20 Typical switch-off time and minimum tolerance time for test pulses (OSSD signals). The
permissible test pulse length depends on the control voltage level at the STO-A and STO-B inputs.
Example: input voltage for STO-A and STO-B = 24 V è OSSD signals with a test pulse length of 3.5 ms
are tolerated.
3.2.4
Feedback contact C1, C2 [X40]
If the STO function is not active, the feedback contact is opened. This is the case if the control voltage
is present at STO-A and STO-B, if only one of the two control voltages STO-A or STO-B is present, if the
24 V logic supply voltage is switched off or if the supply voltage fails.
When the STO function is active, the relay contact is closed.
The feedback contact has a single channel and may only be used for monitoring.
Electrical data of the feedback contact è Tab. 21 Technical data: electrical data of the feedback
contact C1/C2. Time response of the feedback contact è Tab. 20 Typical switch-off time and minimum
tolerance time for test pulses (OSSD signals).
When the 24 V supply of the basic unit is switched on and off, the switching status of the relay may
deviate briefly (approx. 100 ms) from the status of the STO-A and STO-B control inputs due to the
difference in speed at which the internal supply voltage starts up.
In order to ensure the DC and SFF values specified in the technical data, the status of the feedback
contact C1/C2 must be registered whenever the safety function is requested.
After the safety function has been requested, there must be a signal change at the feedback contact
within an application-specific time. In the event of a violation, a safety-oriented reaction must take
place.
3.2.5
24 V, 0 V auxiliary power supply [X40]
The motor controller CMMP-AS-...-M0 supplies a 24 V auxiliary power supply at [X40]. This can be
employed when using the C1/C2 feedback contact or for power to external active sensors.
Electrical data of the auxiliary power supply è 8.1.3 Electrical data [X40], è Tab. 22 Technical data:
electrical data of the auxiliary supply output.
3.3
Functions in the motor controller CMMP-AS-...-M0
The following functions in the motor controller CMMP-AS-...-M0 are not certified according to
EN 61800-5-2. They are functional supplements and offer additional diagnostic options.
Error messages generated by the integrated safety circuit, e. g. exceeding the discrepancy time,
are recorded and evaluated by the non-safety-related state machine of the motor controller. If the
conditions for an error status are detected, an error message is generated. In this case, it cannot be
guaranteed under all circumstances that the power output stage has been safely switched off.
The integrated safety circuit exclusively controls the provision of the driver supply for the motor con-
troller CMMP-AS-...-M0. The levels of the input voltage are monitored area by area, but the integrated
safety circuit does not have its own error evaluation mechanisms or the option of an error display.
14
Festo — CMMP-AS-...-M0 — 2022-07c
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