Exception in PLC Designer when closing or changing a tab in the case of an existing online connection (eliminated from PLC Designer V3.5.1)

Eliminated from:
PLC Designer V3.5.1
 
Behaviour of the new version:
When closing or changing tabs, no Exception occurs.
 
What happens?
PLC Designer indicates an Exception with the message:
Collection was modified; enumeration operation may not execute

When does the problem occur?
The above-described response occurs if an online connection has been established between PLC Designer and control system and an i700 servo inverter, I/O1000 bus coupler EPM-S110 or EPM-S130 tab is closed or it is quickly changed between tabs of this type.

Which products are concerned?
PLC Designer from V3.5

i700 servo inverter
I/O1000 bus coupler EPM-S110 (CAN open)
I/O1000 bus coupler EPM-S130 (EtherCAT)

Possible diagnostics:
None

Short-term measures/recommendations:
Click <Continue> in the Exception dialog. After this, you can continue working without problems.

Evaluation:
The Exception rarely occurs. The project is not damaged by the Exception. After acknowledging the Exception, you can continue working with the PLC Designer without problems.

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