Westermo FD-10 - Manual (Page 23)

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7.2.1.1 Expert configuration
Serial transfer > Expert parameters
Max time between bytes Set the maximum allowed time between bytes in a serial
in frame [ms] frame. Default is 100. Useful when a frame will be divided
by transferring units (modem) which can cause a gap in
parts of the frame.
Fixed frame length Fixed 25 byte frame length. Should not be used.
20 data bytes Only when used together with old system.
Fixed frame length Fixed 37 byte frame length. Should not be used.
32 data bytes Only when used together with old system.
Variable frame length Should be selected for all Westermo Fieldbus Adapters.
1..249 data bytes
PROFIBUS-DP > Expert parameters
ID number Show the ID number of FD-10. Can’t be changed.
CPU type Hardware information. For service purpose only.
Can’t be changed.
7.2.2 PROFIBUS DP I/O data
Ordinary PROFIBUS DP I/O data are used by FD-10 A, including one data word in and
one out for the serial transfer control. Additional programming of the PROFIBUS DP
master to control I/O data transfer is needed, as defined below.
7.2.2.1 Output data word
Data transmitted from PROFIBUS DP master to FD-10 A.The first word is the serial
transfer command word and the remaining 2 to 65 words are ordinary output data
sent to addressed remote Fieldbus Adapter.
Out word 1 high byte (bit 15..8) is the serial transfer command byte,
with following content:
EN ENable FD-10 (bit15).
This bit must always be set high (1) for normal operation.When set, FD-10
indicates data set ready by the EN bit being set in the Input status word. EN
bit set to low (0) disable FD-10.
SDO Send actual Data Once, toggle bit (bit 14).
When this toggle bit change state, all out words are taken from DP output
data words and transmitted directly over the serial transfer interface of FD-10.
Word 15 High byte 8 7 Low byte 0
1 EN SDO – CNF RES – – – Transfer slave address, in range 0–254
2 Out data word 1, high byte Out data word 1, low byte
… … …
… … …
65 Out data word 64, high byte Out data word 64, low byte