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Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
12
Typical response times
Appendix
12.6 Typical response times
12.6.1 Typical response times of the DCS21B option
The following table lists the response times of the DCS21B options.
For the PROFIsafe application, the cycle time (T_cycle) is 28 ms. The specified
response times correspond to the maximum runtime for the specific application within
the DCS21B option. For bus applications, the processing time for safety control and,
depending on the application, additional, application-specific response times for sensors
and actuators, must be added to calculate the total run time. For calculating the runtime
in the safety control, refer to the technical documentation of the manufacturer.
INFORMATION
If the "overspeed distance monitoring" filter is used, the response time will increase
depending on the set distance.
Function Response
time [ms]
Explanation
PROFIsafe bus timeout
(minimum timeout interval)
125 The minimum timeout interval for the bus is
125 ms. If a general bus error is assumed (e.g.
corrupt data, interrupted communication), all
outputs of the DCS21B option are disabled once
the specified time has elapsed. The same applies
to the connection from the DCS21B to the safety
controller.
Note: The timeout interval of the bus system
can be scaled to any higher value in the safety
controller (e.g. S7) under "HW Config". The
timeout interval must be used for calculating
the response time of the DCS21B option.
Reading-in a digital NC contact and
transfer to the safety controller via
PROFIsafe.
84 The DCS21B recognizes the opening of a live
contact within one cycle. Two more cycles are
required for transmission to the safe bus system.
Reading-in a digital NO contact and
transfer to the safety controller via
PROFIsafe.
112 For a NO contact to be recognized as active ("1"),
an active signal level must be present at the input
for an entire clock cycle of the DCS21B option. In
the worst case, sampling will take two cycles to
make relevant information available for internal
processing. Two more cycles are required for
transfer to the bus; this means the total number of
cycles is 4.
Response of an already activated
monitoring function using local
disconnection for position and speed
processing
• Observe the note at the end of this
table
56 For a monitoring function that has already been
activated via PROFIsafe, the DCS21B option
needs one cycle to calculate the current speed
value. During the next cycle, the result is entered in
the system image once the monitoring function was
calculated. If local disconnection has been
activated (available in the DCS21B option), a
programmed output is operated within the same
cycle, if required.
Note: When using local disconnection and
ENABLE via the bus system, the specified time
is the relevant response time.
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