What happens?
The Lenze Controller does not transmit any process data telegrams (PDO) via the CAN bus for several PLC cycles. In the case of position setpoint transmission, this may lead to "clicking" drives.
When does this behaviour occur?
If the Controller has to transmit several parameter telegrams (SDO) in a row and event- or time-controlled transmission is selected for one of the CAN slaves in the PLC Designer project (transmission type: asynchronous - type 254 or type 255), the Controller will transmit the parameter telegrams before the process data telegrams. I.e., PDOs and sync telegrams may be delayed by SDOs.
This behaviour may e.g. occur when scanning the CAN bus with the EASY Starter using the Controller as gateway.
Which products are affected?
L-force 3200 C Controller V3.0 and higher
L-force p500 Controller V3.3 and higher
L-force c300 Controller V3.7and higher
L-force p300 Controller V3.7 and higher
Easy Starter
Short-term measures:
Select a sync-controlled transmission type (synchronous) for the CAN slaves in the PLC project.
Stop the machine before connecting the EASY Starter via the Controller with a CAN node if you are sure that communication between the Controller and all CAN slaves is sync-controlled.
Evaluation/recommendations:
If the EASY Starter goes online with a CAN node using the L-force Controller as gateway, this may lead to "clicking" noises with the drives connected as nodes to the CAN bus.
