Illustration 7.8
Bits 12–15 transfer parameter commands from master to
slave and return processed slave responses to the master.
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 Parameter Commands from Master to Slave
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 Parameter Response from Slave to Master
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 exist.
1 There is no write access to the defined parameter.
2 Data value exceeds the parameter limits.
3 The sub index used does not exist.
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 unit'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 factory set-
up is selected.
Table 7.6 Fault Definitions
7.3.8
Parameter Number (PNU)
Bits 0–1 transfer parameter numbers. The function of the
relevant parameter is defined in the parameter description
in the Programming Guide.
RS485 Installation and Set-... Operating Instructions
72 Danfoss A/S © 09/2014 All rights reserved. MG90V302
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