11
Response times
Calculation of response times
Manual – MOVISAFE
®
CS..A Safety Card
86
11
Response times
The response time plays a decisive role in the design and execution of drive safety
functions in systems and machines. In order to match the response time to the re-
quirements of a drive safety function, always take the entire system into account, from
the sensor (or command device) to the actuator. The following times are of particular
importance in connection with the MOVISAFE
®
CS..A safety card:
•
Response time of the connected sensors
•
PROFIsafe cycle time
•
Processing time (cycle time) in the safety controller
•
PROFIsafe monitoring time
F_WD_Time
•
Internal response times of the MOVISAFE
®
CS..A safety card
•
Response time of the actuators (e.g. frequency inverters)
Establish the response sequence for each drive safety function in your application and
determine the maximum response time for each case, taking into account the relevant
manufacturer data. Observe in particular the information contained in the safety docu-
mentation of the safety controller used.
Details of the maximum response time of the MOVISAFE
®
CS..A safety card can be
found in the chapter "Technical data". For detailed information regarding response
time consideration for safe PROFIsafe communication, refer to the respective stand-
ard: IEC 61784-3-3.
11.1
Calculation of response times
The following response times are fixed:
•
T
_Sys
= 4 ms (cycle time of the system)
•
T
_Task
= 0.5 ms (cycle time of a process)
•
Maximum fault response time T
_FRZ
= 9 ms applies for the deactivation of the in-
ternal output F-DO_STO and the external safe digital outputs F-DO, as well as for
setting the error status of the safe process input data (F-PE).
•
The response times of the safety cards in relation to the safe digital outputs (F-DO)
apply for ohmic loads ≤30 kΩ.
24842532/EN – 04/2018
