Application Example - Siemens SINUMERIK 840D sl Function Manual

Connecting sensors and actuators
8.6 Safe Brake Test (SBT)
8.6.8

Application example

Information and notes for typical applications are provided as example in the following
description.
Parameterization of the machine data
MD37000
$MA_FIXED_STOP_MODE
MD37030
$MA_FIXED_STOP_THRESHOLD
MD37050
$MA_FIXED_STOP_ALARM_MASK
MD36966 $MA_SAFE_BRAKET‐
EST_TORQUE
MD36967 $MA_SAFE_BRAKET‐
EST_POS_TOL
MD36968 $MA_SAFE_BRAKET‐
EST_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 canceled (see Fig. "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 parameterized as follows for
the brake test:
MD37050
$MA_FIXED_STOP_ALARM_MASK
MD37052
$MA_FIXED_STOP_ALARM_REAC‐
TION
Example of calling FB11
302
Machine data
OPEN DB37
UN DBX 92.5
= M 111.5
O E 7.5.
O M 110.7
FP M 110.0
Value Description
2 Enable brake test
2 mm Threshold for fixed stop detection. The value must
be less than the traversing distance of FC18.
Con‐ Only initiate alarm 20095, if the brake test torque is
tent + less than the holding torque.
16
% Enter test torque referred to p2003
1 mm Position tolerance, brake test
1 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
//Brake test, Z axis
//Feedback signal, brake open
//Z axis brake is closed
//Initiation for the brake test, Z axis
//Brake test already started
//Edge marker
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated