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Status
Meaning
0x02:
Timeout expired. The Modbus slave did not respond within the
configured timeout period
0x08:
Modbus response telegram correctly received
0x20:
Modbus request too large (> configured PROFIBUS Output
size-3)
0x40:
Modbus response too large (> configured PROFIBUS Input
size-3)
Table 12:
Status Codes
– Byte 2:If a correct Modbus response telegram is received, the receive
confirmation number is incremented (+1).
– Byte 3:Stores the data size of the Modbus response telegram
Modbus ASCII Master
The transmit and reception of Modbus ASCII telegrams complies with
the mechanism for the Modbus RTU Master described in detail in
chapter „R [
}
15]eceive Data“, Section „Modbus RTU Master.
Every request telegram received from the PROFIBUS DP Master is
automatically extended by a colon (:) as well as the calculated LRC
and a CR LF string.
Received response telegrams are checked and forwarded without
colon (:), LRC and CR LF string to the PROFIBUS DP Master.
Data exchange
