Salicru CV10-002-S2, User Manual

Page: 84 / 104

84 - 104 Communication protocol
R/W characteristics means the function is with read and write characteristics. For example, “communication
control command” is writing chrematistics and control the inverter with writing command (06H). R characteristic
can only read other than write and W characteristic can only write other than read.
Note: when operate on the inverter with the table above, it is necessary to enable some parameters. For
example, the operation of running and stopping, it is necessary to set P00.01 to communication running
command channel and set P00.02 to MODBUS communication channel. And when operate on “PID reference”,
it is necessary to set P09.00 to “MODBUS communication setting”.
The encoding rule for device code (corresponds to identifying code 2103H of the inverter)
Code high
8bit
Meaning
Code low 8
position
Meaning
01 CV10 0x0d CV10 inverters
7.3.5 Fieldbus ratio values
The communication data is expressed by hex in actual application and there is no radix point in hex. For
example, 50.12Hz can not be expressed by hex so 50.12 can be magnified by 100 times into 5012, so hex
1394H can be used to express 50.12.
A non-integer can be timed by a multiple to get an integer and the integer can be called fieldbus ratio values.
The fieldbus ratio values are refered to the radix point of the setting range or default value in the function parameter list. If
there are figures behind the radix point (n=1), then the fieldbus ratio value m is
10
n . Take the table as the example:
If there is one figure behind the radix point in the setting range or the default value, then the fieldbus ratio value is 10. If the data
received by the upper monitor is 50, then the “hibernation restore delay time” is 5.0 (5.0=50÷10).
If Modbus communication is used to control the hibernation restore delay time as 5.0s. Firstly, 5.0 can be
magnified by 10 times to integer 50 (32H) and then this data can be sent.
After the inverter receives the command, it will change 50 into 5 according to the fieldbus ratio value and then
set the hibernation restore delay time as 5s.
Another example, after the upper monitor sends the command of reading the parameter of hibernation restore
delay time ,if the response message of the inverter is as following: