Sequence - Siemens Sinumerik 840D sl Function Manual

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7.6.6

Sequence

Warning
!
The brake test must be carried out before carrying out the test stop. If the brake
test was not successful (i.e. the brake cannot hold the axis), then it is not
permissible that the test stop is carried out. Users must carefully take this into
consideration when configuring the brake test and test stop. The brake may only
be tested when the axis is in an absolutely safe position.
The brake test must always be started when the axis is at a standstill. For the
entire duration of the brake test, the enable signals of the parameterized axis must
be set to enable (e.g. the controller inhibit, feed enable signals). It must be ensured
that the feed override of 100% is effective.
Monitoring limits of the PLC sequence signals
Step
Activate brake test
Brake test active
Close brake
Brake closed
Output traversing command
Check, output traversing command
Wait for the holding time
De--select brake test/open brake
The PLC signals described here are used in or as parameters in the basic program
blocks FB 11 and FC 18.
For a PLC--monitored/controlled axis, also see:
Reference: /FB2/, P2 "Autonomous single--axis processes"
Note
The signals shown here are only intended for diagnostics and providing an
understanding. The signals should not be influenced by the user program
elsewhere.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Status/expected feedback
DBX 11.0 = 1
DBX 71.0 = 1
DBX 23.5 = 1
DBX 92.5 = 0
DBX 64.6 or DBX 64.7
DBX62.5 = 1
DBX62.5 = 1
DBX71.0 = 0
Connecting Sensors/Actuators
7.6 Safe Brake Test (SBT)
Monitoring time value
TV_BTactiv
TV_BTactiv
TV_Bclose
TV_Bclose
TV_FeedCommand
TV_FXSreached
TV_FXShold
TV_BTactiv
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