Siemens SINUMERIK 840D sl Function Manual page 346

K3: Compensations
5.10 Compensation functions for suspended axes
During this time, user-specific actions, such engaging the holding brakes of the suspended
axes, are performed.
Note
The reboot delay is only effective on a request to reboot the NC (NC reset) via the user
interface.
In the case of a power-on reset by switching the control off and on again, pressing the reset
button on the front of the NCU, or power failure, a parameterized reboot delay time will have
no effect.
Alarm 2900 "Reboot after a delay"
When a reboot request is detected, alarm 2900 "Reboot after a delay" is triggered.
Alarm responses
The following responses are triggered by the alarm 2900:
● The NC/PLC interface signals are reset:
– DB11 DBX 6.3 = 0 (mode group ready) ; all mode groups
– DB21, ... DBX 36.5 = 0 (channel ready) for all channels
– DB31, ... DBX 61.2 = 0 (axis ready) for all channels
● Braking the axis / spindles at the current limit.
For further details, see machine data:
– MD36610 $MA_AX_EMERGENCY_STOP_TIME (braking ramp time when errors
– MD36620 $MA_SERVO_DISABLE_DELAY_TIME (OFF delay of the controller enable)
The NC/PLC interface signal "NC ready" remains set:
DB10 DBX108.7 == 1
Alarm suppression
With the machine data, display of the alarm 2900 "Reboot after a delay" will be suppressed
on the user interface:
MD11410 $MN_SUPPRESS_ALARM_MASKBit 20 = 1
The alarm responses are not affected by this.
Controlling holding brakes
During the reboot operation of the PLC, the PLC outputs defined as 0 are reset. Control of the
holding brakes must therefore be connected on the user side in such a way that the brakes
engage or remain engaged on a control signal == 0 and are released or remain released on
a control signal == 1.
Parameter assignment
The reboot delay time is set in machine data:
MD10088 $MN_REBOOT_DELAY_TIME = <reboot delay time>
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions