Application Example - Siemens Sinumerik 840D sl Function Manual

Connecting Sensors/Actuators
7.6 Safe Brake Test (SBT)
7.6.8

Application example

Information and notes for typical applications are provided as example in the follo-
wing description.
Parameterization of the machine data
Machine data
MD37000 $MA_FIXED_STOP_MODE
MD37030 $MA_FIXED_STOP_THRESHOLD
MD36966 $MA_SAFE_BRAKETEST_TORQUE
MD36967 $MA_SAFE_BRAKETEST_POS_TOL
MD36968 $MA_SAFE_BRAKETEST_CONTROL
MD37000 $MA_FIXED_STOP_MODE, bit1 = 1 is the prerequisite for the SBT; only
then does the NCK evaluate the PLC signal "Start brake test" If this is not the
case, a timeout after the brake test has started ensures that the SBT (FB11) is
aborted (see Fig. 7-36 "Sequence function test of the mechanical braking system").
If, when starting the brake test using axis DB.DBX11.0 = 1, it is identified that for
this axis MD36901 $MA_SAFE_FUNCTION_ENABLE = 0, then Alarm 27033
"Axis %1 parameterization of the MD %2[%3] invalid, error code %4" is output.
If the "travel to fixed stop" function is used elsewhere, then the parameterization of
the fixed stop alarms should be adapted. The fixed stop alarms should be para-
meterized as follows for the brake test:
MD37050 $MA_FIXED_STOP_ALARM_MASK
MD37052 $MA_FIXED_STOP_ALARM_REACTION
Example of calling FB11
AUF DB37
UN DBX 92.5
= M
O E
O M
FP M
UN M
S M
7-336
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Value
2H
2 mm
%
1 mm
1
//Brake test Z axis
//Feedback signal, brake open
111.5 //Brake Z axis is closed
7.5; //Initiates the brake test, Z axis
110.7 //Brake test already started
110.0 //Edge marker
111.4 //Fault has occurred
110.7 //Brake test running
Description
Enable brake test
Threshold for fixed stop detection. The
value must be less than the traversing
distance of the FC 18
Enter test torque referred to p2003
Position tolerance, brake test
Bit 0 = 1: The measured torque at the
instant in time that the brake test is selected
is used as the average value of the reduced
torque limit.
2H Enable fixed stop alarms
Bit 0 --4 =1 Response, fixed stop alarms
© Siemens AG 2015 All Rights Reserved
10/15