LMV Series Technical Instructions
Document No. LV3-1000
SCC Inc. Page 17 Section 7
Modbus in connection with ACS410 / AZL2…
If the ACS410 PC tool is being used while writing to the LMV3 via Modbus, it must be taken into
consideration that write access via Modbus will be rejected if, at the same time, the ACS410 also makes
a write access to parameters. Also, the simultaneous setting of a parameter from the AZL2… and the
Modbus master must be avoided, since it would not be possible to predict who is granted the access
right. Write access via Modbus is possible at any time, independent of the AZL2… or ACS410 PC tool.
Error Handling
In the event of erroneous telegrams (CRC errors, etc.), the AZL2… does not send an exception code
(refer to Modbus definition), but ignores the messages. This is because commercially available Modbus
drivers do not normally respond to exception codes.
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