Which products are affected?
ESP-DDS2-x (Global Drive PLC Developer Studio Professional and Basic V2.x)
What happens?
When writing a code via the
Parameter monitor (register card
Resources), Global Drive PLC Developer Studio (DDS) logs off indicating the communication error 41729 (error while writing an OPC item).
When does the problem occur?
When defining the communication channel, the
System bus Server Driver was selected via the menu item
Online>Communication parameter. In the online mode, the
Parameter monitor is used to write a code whose value can only be modified if PLC program processing has been stopped or if the drive controller has been inhibited. If none of the conditions which allow the code to be modified has been fulfilled, a communication error occurs and DDS logs off. Examples for those codes are:
- C0002 - Load parameter set: PLC must be stopped
- C0086 - Motor type setting: Drive controller must be inhibited
If the
CAN 8220 driver is used instead of the
System bus Server Driver and if a code is written whose condition for modification has not been not fulfilled, the error message
Write error at code: Cxxxx will occur. DDS does
not log off.
Possible diagnostics?
Verify with the help of the drive controller documentation (in the code table) or the user codes (C3000 to C7999) in the Instance Parameter Manager (register card
Resources) if the code to be written can only be modified under certain conditions.
Short-term measures/recommendations?
Use the
CAN 8220 driver instead of the
System bus Server Driver if you do not want to communicate simultaneously with the drive controllers via several software programs (e. g. DDS and Global Drive Oscilloscope).
Evaluation:
If an error occurs during writing via the
System bus Server Driver, the communication between DDS and the drive controller (e. g. Servo PLC) will be immediately interrupted. After the communication has been interrupted, you can immediately log in the drive controller again. The function restriction does not concern the
CAN 8220 driver.
