Fixed Stop Is Reached - Siemens SINUMERIK 840D sl Function Manual

6.2.2.2

Fixed stop is reached

Detecting the fixed stop
Detecting the fixed stop or identifying that the machine axis has reached the fixed stop can be
set using the following machine data:
MD37040 $MA_FIXED_STOP_BY_SENSOR = <value> (fixed stop detection via sensor)
<value>
Ineffective NC/PLC interface signals
When the axis is in the "Fixed stop reached" state, the following NC/PLC interface signals have
no effect:
● DB31, ... DBX1.3 (axis/spindle disable)
● DB31, ... DBX2.1 (controller enable)
Actions when the fixed stop is reached
The following actions are executed when the fixed stop is reached:
● The torque in the drive is increased up to the programmed clamping torque (FXST)
● The remaining distance to go is deleted
● The position setpoint is tracked
● The NC/PLC interface signal is set: DB31, ... DBX62.5 = 1 ("fixed stop reached")
● Executing a block change:
– Executing a block change when the fixed stop is reached: MD37060
– Block change is only executed after the acknowledgment by the PLC user program:
In order to also maintain the clamping torque after the block change, the NC still outputs a
setpoint for the machine axis.
● Activating the fixed stop monitoring or the monitoring window
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Meaning
0 The fixed stop has been reached when the contour deviation of the machine axis has ex‐
ceeded the value set in the machine data:
MD37030 $MA_FIXED_STOP_THRESHOLD (threshold for fixed stop detection)
1 An external sensor detects when the fixed stop has been reached and informs the control
via the following axial NC/PLC interface signal:
DB31, ... DBX1.2 == 1 (sensor for fixed stop)
2 The fixed stop has been reached, if one of the conditions, specified under <value> == 0
OR <value> == 1 applies.
$MA_FIXED_STOP_ACKN_MASK, Bit 1 = 0
The block change is immediately executed after reaching the fixed stop.
MD37060 $MA_FIXED_STOP_ACKN_MASK, Bit 1 = 1
After reaching the fixed stop, the block is not changed until acknowledgment by the PLC
user program:
DB31, ... DBX1.1 == 1 (acknowledge fixed stop reached)
F1: Travel to fixed stop
6.2 Detailed description
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