For EtherNet/IP communication, the objects are addressed according to the following scheme:
Class → instance → attribute
ClassAll parameters of a sub-device (e.g. drive) are mapped to the manufacturer-specific classes 100 (0x64) + sub-device index, i.e. sub-device 0 --> class 100, sub-device 1 --> class 101,…, sub-device 98 --> class 198.
InstanceThe instance number is identical to the IDN of the drive parameter.
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Structure of the IDN |
The instance number can be calculated with the following formula:
Inst | Instance number |
type | Parameter type (0 for S-parameters and 1 for P-parameters) |
set | Set number |
block | Data block number |
The format of the parameter depends on the attribute number.
The operating data can have four different formats:
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Data length 2 bytes → W
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Data length 4 bytes → L
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ASCII text with max. length of 64 bytes → T
There are three types of parameters:
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Single parameters
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Command parameters
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List parameters