BONFIGLIOLI Vectron Agile VABus/TCP, Руководство по связи, Страница: 36 / 72

8.1.2 Send Request / Enquiry Telegram
Send request PLC

frequency inverter:
Byte 0 1 2 3 4 5
Header NoB SYS DS P.-No.
7 6 5…0 LSB MSB
R/W 0 0 4 nn nn nnnn
Header: Bit 7 R/W 0 = Send request
NoB: Byte number Number of relevant bytes ([Byte 2] – [Byte 5])
NoB will always be “4” for send requests.
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

PLC:
Byte 0 1 2 3 4 5 6 7 8 9
…
n
Header NoB SYS DS P.-No. data
7 6 5…0 LSB MSB uint/int data
R/W E 0 nn nn nn nnnn LSB MSB
long data
LSB MSB
string data
first
character
last
character
Header: Bit 7 R/W 0 = Send response
Bit 6 E 0 = no error
1 = error
if (E == 1)

byte 6+7 contains error code (

NoB = 6)
NoB: Byte number Number of relevant bytes
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
Agile
VABus/TCP 12/13