The Pke Field; Parameter Number (Pnu); Index (Ind) - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

RS-485 Installation and Set...

7.4.7 The PKE Field

The PKE field contains two subfields: Parameter command
and response (AK) and Parameter number (PNU):
PKE IND
AK PNU
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Figure 7.8 PKE Field
Bits no. 12-15 transfer parameter commands from master
to follower and return processed follower responses to the
master.
Parameter commands master ⇒ follower
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 text
Table 7.5 Parameter Commands
Response follower ⇒ 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 7.6 Response
MG18C522
Design Guide
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 PWE
Error code
high low
0
1
2
3
4
5
6
7
9
11
15
17
18
100
>100
130
131
132
252
253
254
255

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 chapter 6 How to Program.

7.4.9 Index (IND)

The index is used with the parameter number to read/
write-access parameters with an index, for example,
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.
Danfoss A/S © Rev. 2014-01-14 All rights reserved.
Illegal Parameter Number
Parameter cannot be changed.
Upper or lower limit exceeded
Subindex corrupted
No Array
Wrong Data Type
Not used
Not used
Description element not available
No parameter write access
No text available
Not while Running
Other error
No bus access for this parameter
Write to factory set-up not possible
No LCP access
Unknown viewer
Request not supported
Unknown attribute
No error
Table 7.7 Follower Report
+ Specification
91
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