The Pke Field; Parameter Number (Pnu); Index (Ind) - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...

10.7.7 The PKE Field

The PKE field contains two sub fields:
•
Parameter command and response AK
•
Parameter number PNU
PKE IND
AK PNU
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Figure 10.9 PKE Field
Bits no. 12–15 transfer parameter commands from master
to follower and return processed follower responses to the
master.
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 10.3 Parameter Commands Master⇒Follower
MG34S222
Design Guide
Bit no.
15
0
0
0
0
1
PWE PWE
high low
If the command cannot be performed, the follower sends
this response:
0111 Command cannot be performed
- and issues the following fault report in the parameter
value (PWE):

10.7.8 Parameter Number (PNU)

Bits no. 0–11 transfer parameter numbers. The function of
the relevant parameter is defined in the parameter
description in the Programming Guide.

10.7.9 Index (IND)

The index is used together with the parameter number to
read/write-access parameters with an index, for example,
15-30 Alarm Log: Error Code. The index consists of a low
byte and a high byte.
Only the low byte is used as an index.
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
Response
14 13 12
0 0 0 No response
0 0 1 Parameter value transferred (word)
0 1 0 Parameter value transferred (double
word)
1 1 1 Command cannot be performed
1 1 1 text transferred
Table 10.4 Response Follower⇒Master
PWE low Fault report
(hex)
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 present mode of the adjustable
frequency drive. 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 10.5 Fault Report
10 10
271