TR-Electronic MP Series - Parameter Access Via Acyclic Data Exchange (Record Data); Table 5: Record Data Request

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06/06/2019 TR - EMO - BA - DGB - 0019 - 08 Page 159 of 252
5.4 Parameter access via acyclic data exchange (record data)
Up to a maximum of 4 bytes of useful data can be transmitted with a PKW command.
Much greater quantities of data can be transmitted with an acyclic parameter
command, on the other hand. In particular, sub-areas of arrays can be transmitted in a
command.
The acyclic connection between IO controller and encoTRive is created automatically.
The IO controller writes an acyclic request with an ID, which the encoTRive checks
and processes before finally sending a response with the corresponding ID.
Please note the following:
● Only one command can be processed at a time.
● The initiative always comes from the IO controller (no spontaneous messages)
● Only one parameter can be processed in a command.
Byte
Name
Meaning
0
Request reference
Uniquely identifies request / response. The control changes the
reference for each new request to ensure unique assignment.
1
Request ID
0x01 Request parameter – read parameter
0x02 Change parameter – write parameter
2
Axis
Axis addressing for multi-axis drives.
Not currently evaluated
3
Number of
parameters
With multi-parameter accesses, this field contains the number of
parameters. With encoTRive: value 0x01
4
Attribute
Specifies what is to be accessed:
0x10 Access to value
0x20 Access to description
5
Number of
elements
When accessing simple parameters: value 0x00
Otherwise: Number of array elements to be accessed.
6
Parameter number
High Byte
7
Parameter number
Low Byte
8
Subindex
High Byte
9
Subindex
Low Byte
10
Format
Data type according to Table 25
page 195;
Also allowed are:
0x41 Byte
0x42 Word
0x43 Double Word
This part is only available
when write-accessing
parameters
11
Number of values
Number of following values
12-...
Values
Table 5: Record Data Request