11.03
2 General Information about Integrated Safety Systems
2.6 Basics of SINUMERIK Safety Integrated
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
2-35
2.6.4
Monitoring clock cycle and crosswise data comparison clock
cycle
The safety-relevant functions are monitored cyclically in the monitoring cycle
that can be set jointly for all axes/spindles via the following machine data:
Setting the monitoring cycle time
For 840D
MD 10090: $MN_SAFETY_SYSCLOCK_TIME_RATIO
The specified clock cycle is checked and rounded to the next
possible value when the control runs-up and every time the
machine data changes.
The resulting monitoring cycle is displayed via MD 10091:
$MN_INFO_SAFETY_CYCLE_TIME
(refer to Chapter 4, "Machine data for SINUMERIK 840D").
For 611 digital
MD 1300: $MD_SAFETY_CYCLE_TIME
(refer to Chapter 4, "Machine data for SIMODRIVE 611
digital")
!
Warning
The monitoring cycle determines the response time of the safety-relevant
functions. It must therefore be selected to be
≤
25 ms. The higher the
monitoring cycle setting, the greater the amount by which the monitored limit
value is violated in the event of an error and the more the drives overshoot. .
MD 10092: $MN_INFO_CROSSCHECK_CYCLE_TIME specifies the maximum
crosswise comparison clock cycle in seconds. If the monitoring clock cycle is
modified, then the crosswise comparison clock cycle is also changed.
To be able to support the various functional configurations of the individual
controls, the crosswise data comparison between the NCK and 611 digital
monitoring channels has been extended on an axis-specific basis.
An axial MD 36992: $MA_SAFE_CROSSCHECK_CYCLE has been introduced
to display the current crosswise data comparison cycle time for each axis.
2.6.5 User
agreement
"User agreement" is the confirmation by an appropriately authorized person
that the currently displayed SI actual position of an axis corresponds to the
actual position on the machine.
To check whether this is the case, the axis can be traversed, for example, to a
known position (e.g. a visual mark) or measured and the SI actual position in
the "User agreement" display compared with the measurement result.
An axis/spindle with integrated safety functions can have the following status:
User agreement = yes
or
User agreement = no
The "User agreement" window always displays the following data for each
axis/spindle with activated Safety Integrated:
•
Machine axis name
Setting the monitoring
cycle time
Displaying the
comparison clock
cycle
Description
