Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx
Page 210 of 260
Version: 25F
6 Response times of the SMX
The response time is a very important safety related characteristic and must be strictly observed
for each application / application related safety function. The following chapter lists the response
times for individual functions, probably also in dependence on further parameters. If these data
are insufficient for a specific application you should validate the actual time behaviour against
the nominal behaviour by means of separate measurements. This applies also for the use of
filter functions in particular.
Safety note:
•
The response times must be determined for each application related safety function
in nominal behaviour and must then be compared with the actual value by using the
following data.
•
Special care must be taken when using filter functions. Depending on the filter length
/ time the response time may be extended, which must be taken into account in the
safety related design.
•
In case of particularly critical problem formulations the temporal behaviour must be
validated by means of measurements.
•
During start-up of the device / alarm or fault reset the outputs may (depending on the
application program) become active over the response time period. This must be
taken into consideration when planning the safety function.
•
When using safe field bus connections (e.g. PROFIsafe, FSoE), the system run-time
(watchdog) must also be included in the calculation.
6.1 Response times in standard operation
The cycle time of the SMX system serves as basis for calculating the response times. Diese ist
in 3 Stufen wählbar und beträgt im Betrieb
T_
Cycle = 16 / 24 / 32 ms
. The specified response
times comply with the corresponding maximum running time for the actual application within the
SMX100 module. Depending on the application, further, application dependent response times
of the sensors and actuators used must be added, in order to obtain the total running time.
Response times with use of digital inputs and outputs at basic modules
Function
Response time [ms]
Explanation
Cycle time
16
24
32
Activation of a monitoring function
by means of ENABLE with
subsequent shut-down via digital
output
16
*)
24
*)
32
*)
Activation of a monitoring function by means of
the ENABLE signal.
Activation of a monitoring function
by means of ENABLE with
subsequent shut-down via safety
relay
39
*)
47
*)
55
*)
Activation of a monitoring function by means
of the ENABLE signal.
