7
Gateway InterBus-S
MG.10.G1.51 – VLT is a registered Danfoss trademark
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Write.Request
No. of subsequent values
invoke_id
Communications
Reference
index
VLT®-Address
No. of Bytes
PCA
IND
High_Parameter value
Low_Parameter value
8082
007
00
02
5FA5
02
08
20CA
0000
0000
0320
The request on the PCP channel now
looks as follows:
All values in hex.
Successful completion is indicated in the
form of a positive confirmation.
If all VLTs are to be parameterized at the
same time, a zero is to be entered instead
of the VLT-address.
Parameter interface in
Read.Request
Responses from the VLT
®
to an order
initiated previosly via Write.Request. Data
is only available in the case of a positive
confirmation; if there is a negative
confirmation, an error code is reported.
1. Word (Parameter-Identification-Value,
PCA); in the lower 11 bits (bits 0..10) the
VLT
®
enters the parameter number; in the
upper four bits (bits 12..15) the type of
response appears.
2. Word (Index/Subindex, IND); the byte
"Index" is only entered if elements of an
array have been accessed. In normal pa-
rameter actions, this byte is not used. The
byte subindex is intended for subsequent
extensions and is not used at this point.
■
Pr
operties of PROFIBUS-DP
Now the length of the data has to be
entered; since, however, this is only pre-
pared for the maximum layout, a length of
112 bytes has to be entered here. Now
follows the data of the VLTs, in the se-
quence of their addresses.
3. + 4. Word (Parameter value, PVA); this
is where the VLT
®
enters the value of the
selected parameter. The third word is the
High-Word; the fourth word is the Low-
Word. The third word is only used if para-
meter values above 65535 have been
transmitted.
Since the values to be transmitted are not
transmitted in comma format, the indivi-
dual parameter value must be divided by a
factor to obtain the actual value. The indi-
vidual parameter factor can be seen in the
manual for the PROFIBUS Option Card.
