Description Of Communication Protocol
V800 Series High Performance Closed-Loop Vector Inverter User manual
Range for relative values is between -10000 ~ 10000, and correspondingly, they falls in -100.00%~
100.00% range of the upper limit value that has been set.
When we need to access several application parameters or monitoring parameters of discrete addresses,
we can first map these parameters to bus control parameter area, and then we access to that area instead.
As a matter of fact, access for mapped parameters is a type of pointer access, and the mapping
parameters can be set in the FA.1 parameter group.
Anomaly Status Information: Relevant Modbus functional code 0x07 (Query)
The frequency inverter's failure warning status and code corresponding to each digit of the returned data
Returned data – digit 7: 0 — No failure on frequency inverter, 1 — Failure on frequency inverter
Returned data – digit 6: 0 — No warning on frequency inverter, 1 — Warning on frequency inverter
Returned data – digit 5~0: each code of failure information corresponds to the identifier code following
Fu in the failure code of the frequency inverter.
Each code of warning information corresponds to the identifier code following aL. in the warning code of
the frequency inverter.
If data 0x8C (10001100) is returned, it indicates that the failure code of the frequency inverter is Fu. 012;
If data 0x64 (01100100) is returned, it indicates that warning code of the frequency inverter is aL.036.
Failure Diagnosis: Relevant Modbus functional code 0x08 (Diagnosis)
Sub-function code list
Return the identical query data
Re-start communication option (restore the “listen only"
status for 04 sub-code)
Enforce slave unit into “Listen Only" status and the salve
unit will not reply; The failed salve unit can be removed
from the communication chain.
Clear all calculators and diagnosing registers
Return the number of bus information items
Total number of bus
information items
Return the number of bus communication failures (CRC
error calculation)
Return the number of bus anomaly failures
Number of anomaly
data items
Return the number of salve unit information items
(corresponding with slave unit address or the
broadcasting information)
Number of valid data
items
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