Westermo FD-80 - Manual (Page 21)

21 6630-2281
Word 15 High byte 8 7 Low byte 0
1 ST – DV – ACK TO – – – – – – – – – –
2 In word 1, high byte In word 1, low byte
– – –
– – –
64 In word 63, high byte In word 63, low byte
7.2.2.2 Input data word
Data is transmitted from the FD-80 to the Profibus DP master. The first word is the
added status word and the remaining 1 to 63 words are ordinary input data received
from the output word addressed remote Fieldbus Adapter.
Input word 1 high byte (bit 15..8) is the serial transfer status byte, with following con-
tent:
ST STatus of serial transfer command FD-80 (bit15).
Set to high (1) when the received command has been
accepted by the FD-80. Set to low (0) if the received
command has not been accepted.
DV Data Valid (bit 13).
For testing purpose only.
Acknowledgement of the command CNF.
ACK ACKnowledgement of serial transfer (bit 11).
Set to high (1) when serial transfer sent output data to a
remote FD-80 has resulted in a received frame with input
data from the remote FD-80.
TO Time Out of serial transfer (bit 10).
Set to high (1) when the last serial transfer of output
data to a remote FD-80 has not resulted in any received
frame within 1,500 ms.
Input word 1 low byte (bit 7..0) is not used.
Input word 2 to 64 is the input data, with following content:
Word 1 High: Input byte 1 Low: Input byte 2
Word 2 High: Input byte 3 Low: Input byte 4
........ ......... .......
Word 63 High: Input byte 125 Low: Input byte 126.