Description Of Output Data - JVL FBG10 User Manual

3.6
Output data, ( data from master to DP-slave ), is configured to 8 byte:
3.6.1 Command Desciption
BYTE 1+2 in output data forms a word, ( bit 15 .. 0 ), where the single bits has the fol-
lowing meaning:
Bit 15+14:
The bits ID1,ID0 are set equal to the value of a two-bit counter in the master, which
counts in the sequence: 00, 01, 10, 11, 00 etc. Every time the master sends new process
data to a FBG10-unit, this counter value is incremented by the master. FBG10 contains
a corresponding counter. When the value of received ID1,ID0 is equal to the counter val-
ue + 1 of FBG10, FBG10 will make the conversion between PROFIBUS and RS 232, and
will hereafter increment the counter value of FBG10. FBG10's counter value can be read
by the master in input data, (see section 3.6.1). When a command is executed the content
of the master- and FBG10- counters will be equal. FBG10 can from the value of ID1,ID0
compared with its own counter value determine if new data processing must take place.
The master can from the counter value of FBG10 determine if a command is executed.
Bit 13:
The bit C/Q, ( Command/Question), indicates for FBG10 if master wants a command ex-
ecuted, ( C/Q = 1 ), or master sends a request to FBG10, ( C/Q = 0 ). If it is a command,
FBG10 will write a new value to a register in the motor controller. If it is a request FBG10
will read a value from a register in the motor controller and return the value to the master.
JVL Industri Elektronik A/S — User Manual — Field Bus Gateway FBG-10

Description of Output Data

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