Operating instructions

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5.2.9. Request / Response Attributes

The table contains an overview of the possible attributes of the PROFIdrive parameter channel.

Field Data type Values Remark

Request reference Unsigned8 0x01..0xFF

Request ID Unsigned8 0x01 request parameter value Identification for read or

write request

0x02 change parameter value

0x42 change parameter non-volatile

0x51 request par. value double word

0x52 change par. value double word

Response ID Unsigned8 0x01 request parameter (+) Positive Identification for the re-

sponse

0x02 change parameter (+) Positive

0x81 request parameter (-) Negative

0x82 change parameter (-) Negative

Axis Unsigned8 0x00..0xFF number (always 0)

Number of param-

eters

Unsigned8 0x01..0x25 Limitation: DP V1 telegram

length

Attribute Unsigned8 0x10 value

0x20 description Data description

0x30 text

Number of ele-

ments

Unsigned8 Limitation: DP V1 telegram

length

0x01-0xFA Quantity 1-234

Parameter num-

ber

Unsigned16 0x0001... number 1-65535 Parameter number

0xFFFF

Subindex Unsigned16 0x0000 number 0-65535 Array pointer

0xFFFF

Format Unsigned8 See table

Number of values Unsigned8 0x01..0xEA Quantity 0-234 Limitation: DP V1 telegram

length

Error number Unsigned16 0x0000... Error number

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.

5.2.11. Request ID

The following request identifications are defined:

0x01 Request parameter

0x02 Change parameter (Data are NOT stored in non-volatile memory, lost at power cycle)

0x42 Change parameter non-volatile (Data are 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)

5.2.12. Response ID

The Response ID indicates if the Read or Write request was successfully performed in the fre-

quency converter. If the response is negative, the request is answered negative (first bit = 1) and

an error code is entered per partial response, instead of the value.

5.2.13. Axis

The axis attribute should be set to zero.

5. How to Access the Parameters VLT

Profibus

MG.33.C4.02 - VLT

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