Danfoss VLT PROFIBUS DP MCA 101 Programming Manual page 31

Parameter Access
Field Data Values
1)
type
Response U8 0x01
ID
0x02
0x81
0x82
Axis U8 0x00–0xFF Number (always
Number of U8 0x01–
parameters 0x25
Attribute U8 0x10
0x20
0x30
Number of U8 0x01–
elements 0xFA
Parameter U16 0x0001...
number
0xFFFF
Subindex U16 0x0000
0xFFFF
Format U8 See Table 5.12
Number of U8 0x01–
values 0xEA
Error U16 0x0000...
number
Table 5.8 Overview: Possible Attributes of the
PROFIdrive Parameter Channel
1) U8 - Unsigned8, U16 - Unsigned16
5.2.10 Request Reference
Unique identification of request/response pair for the
master. The master changes the request reference with
each new request. The slave mirrors the request reference
in the response.
MG37G202
Programming Guide
Remark
Request Identification
parameter (+) of the
Positive response
Change
parameter (+)
Positive
Request
parameter (-)
Negative
Change
parameter (-)
Negative
–
0)
– Limitation:
DP-V1
telegram
length
Value –
Description Data
description
Text –
Quantity 1–234 Limitation:
DP-V1
telegram
length
Number 1–65535 Parameter
number
– –
Number 0–65535 Array pointer
– –
–
Quantity 0–234 Limitation:
DP-V1
telegram
length
Error number –
Danfoss A/S © 01/2016 All rights reserved.
5.2.11 Request ID
0x01 Request parameter.
0x02 Change parameter (data is NOT stored in non-volatile
memory, lost at power cycle).
0x42 Change parameter non-volatile (data is stored in non-
volatile memory).
0x51 Request parameter value double word. All parameters are
formatted and transferred as double word size, regardless
of the actual data type.
0x52 Change parameter value double word. All parameters
must be formatted and sent as double word size,
regardless of data type.
Table 5.9 Defined Request Identification
5.2.12 Response ID
The response ID indicates if the read or write request was
successfully performed in the frequency converter. If the
response is negative, the request is answered as negative
(first bit=1), and a fault code is entered per partial
response instead of the value.
5.2.13 Axis
Set the axis attribute to 0.
5.2.14 Number of Parameters
For multi-parameter requests that specify the number of
the parameter address and/or parameter value areas. For a
single request, the number is 1.
5.2.15 Attribute
The attribute determines which data to access. The
frequency converter responds to the attributes value
(10 H), description (20 H), and text (30 H).
5.2.16 Attribute Value (10 H)
The attribute value allows reading or writing of parameter
values.
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