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PROFINET IO
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8.4.5.4
Parameter value
The parameter value field is included only in Change requests (not in Read requests). The parameter
value field consists of a two-octet parameter value header followed by a list of values. Depending
on the format of the parameter, the octet size of a single value is one, two or four octets. The total
size of the parameter value field thus depends on the format and number of values in the message.
Table 83. Parameter value
The number of values which can be transmitted in one frame has been limited to 39.
8.4.6
Parameter responses
There are two types of parameter responses in PROFIdrive:
•
Write response (response to a Write request)
•
Read response (response to a Read request)
A read response consists of two elements:
•
Response header
•
Parameter value(s) (depending on the request type)
8.4.6.1
Error response
If an error occurred in the Parameter Access, the response provided by the slave is an error
response. An error response contains 4 octets as described below.
Table 84. Error response
Octet
number
Field name
Description
Allowed values
1
Format
Describes the data type of
the parameter.
Use 0x41 for Byte.
Use 0x42 for Word.
Use 0x43 for Double Word.
Value 0x44 is used for Error.
Other values should not be used.
2
Number of val-
ues
Defines the number of val-
ues in the parameter value
field.
Values 0 to 234 are possible. Subject to
limitations as described below.
3...
Value
The value of the parameter.
Values 0 to 65535 are allowed.
Other values are not allowed.
Response header
Parameter value(s)
Octet
number
Field name
Description
Allowed values
1
Function Num-
ber
Operation number.
The slave returns 0xDE to indicate an
error read response.
The slave returns 0xDF to indicate an
error write response.
Other values are not used in the Param-
eter Access.
2
Error Decode
Defines how the error infor-
mation in the following two
fields should be decoded.
Always 128 in PROFIdrive.
Other values are not used in the Param-
eter Access.
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