Parameter commands master
⇒
slave
Bit no.
Parameter command
15
14
13
12
0
0
0
0
No command
0
0
0
1
Read parameter value
0
0
1
0
Write parameter value in RAM (word)
0
0
1
1
Write parameter value in RAM (double word)
1
1
0
1
Write parameter value in RAM and EEPROM (double word)
1
1
1
0
Write parameter value in RAM and EEPROM (word)
1
1
1
1
Read/write text
Table 7.4
Response slave
⇒
master
Bit no.
Response
15
14
13
12
0
0
0
0
No response
0
0
0
1
Parameter value transferred (word)
0
0
1
0
Parameter value transferred (double word)
0
1
1
1
Command cannot be performed
1
1
1
1
text transferred
Table 7.5
If the command cannot be performed, the slave sends this response:
0111 Command cannot be performed
- and issues the following fault report in the parameter value (PWE):
PWE low (Hex)
Fault Report
0
The parameter number used does not exit.
1
There is no write access to the defined parameter
2
Data value exceeds the parameter's limits
3
The sub index used does not exit.
4
The parameter is not the array type.
5
The data type does not match the defined parameter
11
Data change in the defined parameter is not possible in the adjustable frequency drive's present mode.
Certain parameters can only be changed when the motor is turned off
82
There is no bus access to the defined parameter
83
Data change is not possible because the factory set-up is selected.
Table 7.6
7.4.8 Parameter Number (PNU)
Bits no. 0-11 transfer parameter numbers. The function of
the relevant parameter is defined in the parameter
description in .
7.4.9 Index (IND)
The index is used together with the parameter number to
read/write-access parameters with an index, e.g.,
15-30 Alarm Log: Error Code
. The index consists of 2 bytes,
a low byte and a high byte.
Only the low byte is used as an index.
RS-485 Installation and Set...
VLT
®
HVAC Drive Design Guide
MG11BB22 - VLT
®
is a registered Danfoss trademark
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