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DP Configuring Message
Introduction
Meaning
Structure
Identifier Byte
Number (Quantity)
Communications Processor CP 541
EWA 4NEB 812 6188-02
The CP 541 requires the configuring message in the start after the parameter
assignment message, as described in the DP standard. The DP master sends
the DP parameter assignment message to the DP slave (CP 541).
The lengths of input and output data are specified in the configuring mes-
sage. They are compared to the data contained in DB1 of the CP 541.
The configuring message contains one or two identifier bytes.
You define the structure of input and output data with the identifier byte. The
structure of the identifier byte is represented in Table E-1.
Table E-1
Structure of Identifier Byte in Configuring Message
Bit
Value
7, 6
01
The data of the CP 541 are always word-oriented and
word consistent.
5, 4
00
Special ID format, not used
01
Input data
10
Output data
11
Input and output data, not used
3 ... 0
Length of data
0000 ...
1 word
1111
16 words
You can specify up to 2 identifier bytes.
You must specify the input and output data independently of each other.
E
Meaning
E-1
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