92 Unidrive M SI-PROFIBUS User Guide
Issue Number: 3
TELEGRAM 4
The fourth telegram from the PROFIBUS-DP master has the stamp number set to 4.
The data bits contain the mid-high data byte for the parameter being written to.
Example telegram
Data word = 0x1401
Stamp number = 4
Data mid-high byte = 0x01 = 1
When the fourth telegram has been received and processed in the slave node, it is
mirrored in the non-cyclic IN word. This is the signal to the master controller program
that the fourth telegram of the message has been received and understood and the fifth
telegram can be transmitted.
TELEGRAM 5
The fifth telegram from the PROFIBUS-DP master has the stamp number set to 5. The
data bits contain the mid-low data byte for the parameter being written to.
Example telegram
Data word = 0x15EA
Stamp number = 5
Data mid-low byte = 0xEA = 234
When the fifth telegram has been received and processed in the slave node, it is
mirrored in the non-cyclic IN word. This is the signal to the master controller program
that the fifth telegram of the message has been received and understood and the sixth
telegram can be transmitted.
TELEGRAM 6
The sixth telegram from the PROFIBUS-DP master has the stamp number set to 6. The
data bits contain the low data byte for the parameter that is being written to.
Example telegram
Data word = 0x1663
Stamp number = 6
Data low byte = 0x63 = 99
When the sixth telegram has been received and processed in the slave node, it will write
the data (Pr 01.021 = 12553.9) as transmitted (the decimal point is automatically
inserted when the data is transferred to the drive). If the operation is successful, the
ERR bit is reset to 0 and the telegram is reflected in the non-cyclic IN word.
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0100 0000 0001
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0101 1110 1010
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0110 0110 0011
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