Send Request / Enquiry Telegram - BONFIGLIOLI Vectron Agile VABus/TCP Communications Manual

8.1.2

Send Request / Enquiry Telegram

Send request P LC frequency inverter:

Byte 0
Header
7 6 5...0
R/W 0 0
Header: Bit 7 R/W
NoB: Byte number
SYS: Addresses frequency inverters which are connected to a TCP/IP module via CAN System
Bus.
SYS = 0 for direct addressing of frequency inverter in Ethernet connection (SYS = 0...63)
DS: Data set number of parameter (0, 1 ... 4)
P. No.: Parameter number (0 ... 1599)
Send response frequency inverter
Byte 0
Header
7 6 5...0
R/W E 0
R/W
Header: Bit 7
E
Bit 6
NoB: Byte number
SYS: returns value SYS from the request frame
DS: returns dataset number from the request frame
P. No.: returns parameter number from the request frame
data: requested parameter value, byte number depending on data type
If no response from the frequency inverter is received within a given response time (see chapter 8.3,
"Timeout control"), or if the frequency inverter returns incorrect data, the inquiry telegram is repeated
three times (maximum of three transmissions possible).
NAK signals an error. An error may have different causes. Errors may be caused by incorrect data or
an incorrect string.
36
1 2 3 4
NoB SYS DS P.-No.
LSB
4 nn nn nnnn
0 = Send request
Number of relevant bytes ([Byte 2] – [Byte 5])
NoB will always be "4" for send requests.
P LC:

1 2 3 4
NoB SYS DS P.-No.
LSB
nn nn nn nnnn
0 = Send response
0 = no error
1 = error

if (E == 1) byte 6+7 contains error code (
Number of relevant bytes
Agile
VABus/TCP
5
MSB
5 6 7
MSB uint/int data
LSB MSB
long data
LSB
string data
first
character

8 9 ... n
data
MSB
last
character
NoB = 6)
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