Which products are affected?
EVS93xx-EI (Servo PLC Version 7.0)
EVS93xx-ET (Servo PLC Version 7.0 with technology function)
What happens?
The
overrun Taskx error is indicated (C0161=201…208). The Servo PLC changes to the
Stop state and a TRIP is indicated. The exceptional response defined for the drive is triggered (see DDS menu item
Project>Exceptional response).
When does the problem occur?
A PLC project which is running in a Servo PLC V6.x is loaded into a Servo PLC V7.0. As a result, the response described before may occur if at least one of the tasks in the Servo PLC V6.x is utilised by more than 80 %.
PLC projects which are running in a Servo PLC V1.x and V2.x are not affected by this function restriction.
Possible diagnostics?
- Check in the DDS Task Monitor (Resources tab) if the maximum utilisation of one task is larger than 80 % of the monitoring time. Regarding this, please compare the values of the columns maximum runtime and monitoring time.
- Check the version of the Servo PLC to be exchanged before the controller is replaced (see code C0099).
Short-term measures/recommendations?
Optimise the runtime of the project affected.
Contact the Lenze Service department if the function restriction mentioned above occurs.
Evaluation:
In the course of the continuous product improvement some functions extensions and fault eliminations could have been implemented in the Servo PLC V7.0 operating system. As a result, the runtime of the operating system could be increased, i. e. PLC projects which have been running in a Servo PLC V6.x without problems may in exceptional cases cause a Task Overrun in a Servo PLC.
The function restriction described before does not occur if none task of the Servo PLC utilised by more than 80 %.
PLC projects which are running in a Servo PLC V1.x and V2.x are not affected by this function restriction.
