9.7.8 Parameter data transfer
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The acyclic/non-cyclic data access (service access) provides a procedure for the PLC (scan-
ner) to access any drive or device parameter.
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This type of parameter access is typically used for ...
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monitoring or the not me-controlled parameter access with low priority;
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wring parameter data (assembly data) for controlling the inverter (adapter).
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For this purpose, the device supports several methods.
Explicit Messaging
An explicit message is a logic instrucon in the PLC program for the message transfer. It can be
used to read or write a parameter seng or the data of an EtherNet/IP node (assembly data).
If the Allen-Bradley control systems»CompactLogix™«, »ControlLogix®« and »SoLogix™« are
used, the "Explicit Message" instrucon provides the funconalies described in the following
secons. Further PLC types can be found in the programming documentaon of the PLC.
General drive variables (parameters and subindices) are contained in class "0x6E". The
instance is the index number of the parameter and the aribute is the subindex number. If no
subindex is available, the aribute must be set to "0". The aribute value "1" is only suppor-
ted for those clients that do not support the aribute value "0".
All these variables have the data type SINT (8 bit, 1-byte objects), INT (16 bit, 2-byte objects)
or DINT (32 bit, 4-byte objects).
The device parameters and the PLC program variables must have the same data lengths!
Conguring the network
EtherNet/IP
Parameter data transfer
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