User`s guide

180
CHAPTER 8 - CFW-08 OPTIONS AND ACCESSORIES
8.24.3.6
Message
Sequence
8.24.3.7
Variable Code
CODE
Number of the basic variable or parameter
Equipment number:
"7" = CFW08
"9" = any inverter
Specifier:
0 = basic variables
1 = P000 to P099
2 = P100 to P199
3 = P200 to P299
4 = P300 to P399
5 = P400 to P499
6 = P500 to P599
7 = P600 to P699
The inverter and the master test the message syntax.
Theanswers for the respective verified conditions are defined
as follows:
Reading message:
No answer: with wrong message structure, control
characters received incorrectly or wrong inverter address;
NAK:
C
ode
correspond
ingtoa non existing
vari
able orthere
is only a writing variable;
TEXT:
with valid messages.
Writing message:
No answer: with wrong message structure, control
characters received incorrectly or wrong inverter address;
NAK
:C
ode
correspond
ing to a non existing
vari
able, wrong
BCC (checksum byte), only reading variable, VAL out of
the allowed range for the respective variable, operation
parameter out of the alteration
mode;
ACK
: with valid message.
The master should maintain, between two variable
transmissions to the same inverter, a waiting time that is
compatible with the used inverter.
The messages are processed in the inverter in determined
intervals of time.
Therefore, a pause larger than the sum of the times T
proc
+ T
di
+ T
txi
should be ensured between two messages addressed
to the same inverter (refer to item 8.24.6).
The field designated with CODE determines the parameter
address and the basic variables formed by 5 digits (ASCII
characters) as follows:
Equal to zero (0)
X X X
X
X
8.24.3.5
Execution and
Message Test