CMVPFB01A
30
Acyclic Parameter Access
6.3.4 4WPA - Sub-Index (Byte 4)
During normal drive parameter access the data size is always 16-Bit, however, there are several drive
parameters that are 32-Bit in size. Therefore setting the sub-index determines which word of the parameter
is transmitted in the Data Word. Table 29 lists the drive parameters this applies to.
Table 29: 4WPA Sub-Index
Parameter
Function
Sub-Index
P500
Fault History
0 = Fault 1 and 2
1 = Fault 3 and 4
2 = Fault 5 and 6
3 = Fault 7 and 8
P511
kWh
0 = Lower Word
1 = Upper Word
P540
Total Run Time
0 = Lower Word
1 = Upper Word
P541
Total Power-On Time
0 = Lower Word
1 = Upper Word
6.3.5 4WPA - Data Word (Bytes 5 & 6)
During a Write, this contains the data to be written from the master. During a reply message from the drive
this will contain the drive parameter data. Byte 5 is the Upper Byte of the 16 Bit Data Word. Byte 6 is the
Lower Byte of the 16 Bit Data Word.
6.3.6 4WPA - Reserved (Byte 7)
Reserved.
6.4 Acyclic Parameter Access Examples
Only the acyclic parameter information is configured for the these examples.
Example 1: Read Accel1, parameter 104 ( = 20.0, default value)
Valid Transmission:
SEND: message consisting of:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0x03
0x08
or
0x00
(Note 1)
0x00
0x68
0x00
0x00
0x00
0x00
Read
Toggle
Parameter 104
Sub Index
Data
Reserved
RECEIVE: response consisting of:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0x03
0x10
or
0x90
(Note 2)
0x00
0x68
0x00
0x00
0xC8
0x00
Read
Valid Response
Parameter 104
Sub-Index
Data 200
Reserved
