Siemens SINUMERIK 840D sl Function Manual page 982

P3: Basic PLC program for SINUMERIK 840D sl
13.17 Block descriptions
When an error occurs, the actual position value exits the parameterizable monitoring window.
The position controller prevents sagging of the axis. The function test of the brake mechanical
system is negatively acknowledged.
References
A detailed description of the parameterization of the NC and drive within the framework of the
"Safety Integrated" function can be found in:
Function Manual for Safety Integrated
Starts the brake test
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.
controller inhibit, feed enable). Furthermore, the signal at the axis/spindle DB31, ... .DBX28.7
(PLC-controlled axis) is to be set to status 1 by the user program for the complete duration of
the test.
Before activating the NC/PLC interfaces DB31, ... .DBX28.7 (PLC-controlled axis), the axis is
to be switched as "neutral axis", e.g. DB31, ... .DBX8.0 - 8.3 (assign NC axis to channel) is to
be set to channel 0, as well as DB31, ... .DBX8.4 (activation signal when changing this byte)
is to be set.
The return message:
● about the current status can be queried in DB31, ... DBB68.
● the Nc via the signal DB31, ... .DBX63.1 (PLC controls axis) is to be awaited before the
block is started. The direction in which the drive must produce its torque/force is specified
by the PLC in the form of a "traversing motion" (e.g., via FC18).
The axis must be able to reach the destination of this movement without risk of collision if the
brake is unable to produce the necessary torque/force.
Note
Note on FC18
If FC18 is called over the further course of the user program for the same axis, the calls must
be mutually interlocked. For example, this can be achieved via a common call of this function
with an interlocked common data interface for the FC18 parameters. A second option is to call
the FC18 repeatedly, in which case the inactive FC18 will not be processed by the program.
A multiple-use interlock must be provided.
Structure of a brake test
1
2
3
4
5
6
7
982
Step
Start brake test
Close brake
Output traversing command
Issue test travel command
Wait for the holding time
Deselect brake test / open brake
Output test ok
Expected feedback
DBX71.0 = 1
Bclosed = 1
DBX64.6 OR DBX64.7
DBX62.5 = 1
DBX62.5 = 1
DBX71.0 = 0
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Monitoring time value
TV_BTactiv
TV_Bclose
TV_FeedCommand
TV_FXSreached
TV_FXShold
TV_BTactiv
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Basic Functions