Eliminated from:
9400 HighLine SW V10.00.12.00
9400 ServoPLC SW V04.00.12.00
Behaviour of the new version?
If an application is downloaded in which the watchdog cycle is greater than the task cycle of the task with the highest priority the drive will indicate an error 'Watchdog cycle is greater than task cycle'/ (error number 0x246a001b) which cannot be acknowledged.
The error can only be acknowledged if a correct application is downloaded again.
As a result, it is not possible anymore that the motor shaft shows an unexpected behaviour.
What happens?
A permanent overflow of the task with the highest priority (with HighLine: Application Task) cannot be detected and may result in unexpected responses at the motor shaft.
When does the problem occur?
It is possible to download applications in which due to a faulty parameter setting the watchdog cycle is set greater than the task cycle of the task with the highest priority or no wathcdog cycle is setted.
As a result, it is not possible to detect a permanent overflow of the task with the highest priority and an unexpected behaviour may occur at the motor shaft.
If an overflow occurs a too large setpoint (namely by the ratio from real task runtime to nominal task runtime) has been selected at the drive controller.
Which products are affected?
9400 HighLine SW ≤ V09.00.09.00
9400 ServoPLC SW ≤ V03.00.17.00
Possible diagnostics?
Check of the watchdog time set for the task with the highest priority
Short-term measures/recommendations?
Adjustment of the watchdog time.
Evaluation:
The error can be detected during commissioning. The motor connected may not be able to follow e. g. a selected setpoint ramp since the setpoint is selected too large inside the device.
