K3: Compensations
4.7 Measures for hanging (suspended axes)
Extended Functions
300 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
● The following NC/PLC interface signals remain at 1:
DB10 DBX108.7 (NC ready)
By using the machine data:
MD11410 $MN_SUPPRESS_ALARM_MASK (mask for suppressing special alarms) (BIT20)
the alarm 2900 is suppressed, however, the NCK triggers the same reactions.
As alarm 2900 deactivates the axis position control, this alarm must be configured to initiate
that the mechanical brakes are closed by the PLC. Rebooting the PLC forces the PLC
outputs to change to defined zero. The brakes must be connected up in such a way that they
remain closed at zero, i.e. a 1 signal on the PLC allows the brakes to open.
Note
In terms of its reactions, the alarm is the same as the Emergency Stop alarm (3000). For
internal reasons, the reboot delay time of the NCK can be slightly increased.
Activation
The reboot delay can be activated as follows:
MD10088 $MN_REBOOT_DELAY_TIME (reboot delay) > 0
The value that has been entered supplies the reboot delay time in seconds.
Evaluation with a system variable
System variable $AN_REBOOT_DELAY_TIME can be read in a synchronized action. A
value greater than zero indicates that the reboot request was initiated from the command
software and how much time (in seconds) the NCK waits until reboot (POWER OFF and
subsequent POWER ON). In a synchronized action, the user can identify the pending reboot
and appropriately respond (e.g. with "Safe Standstill" for a Safety Integrated application).
$AN_REBOOT_DELAY_TIME is 0.0 provided no reboot request from the command software
is pending.
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