CMVPFB01A
32
Acyclic Parameter Access
Invalid Transmission:
SEND: message trying to write to a read-only parameter:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0x06
0x80
or
0x00
(Note 1)
0x01
0xF6
0x00
0x00
0x15
0x00
Write
Toggle
Parameter 502
Sub Index
Data 21
Reserved
RECEIVE: response consisting of:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0x86
(Note 3)
0x14
or
0x94
(Note 2)
0x01
0xF6
0x00
0x00
0x15
0x00
Read
Valid
Response,
Read-only
parameter
Parameter 502
Sub Index
Data 21
Reserved
Example 3: Read Fault History, Fault 5 and 6, use sub-index byte to access 32-bit parameter
SEND: message consisting of:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
0x03
0x80
or
0x00
(Note 1)
0x01
0xF4
0x01
0x00
0x00
0x00
Read
Toggle
Parameter 500
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)
0x01
0xF4
0x01
0x0D
(Note 4)
0x00
0x00
Read
Valid Response
Parameter 500
Sub Index
Data
3: External Fault; 4: No Fault
Reserved
NOTE
1. Bit 7 of the Access & Status byte will cause the message to be executed when it changes state. Each time
this bit changes state it indicates a new request is being made. This bit must be set by the Master/PLC
once all other bytes have been set in the 4WPA message. Otherwise a partially assembled message will
be processed by the drive causing unexpected results.
2. The drive will copy the state of Bit 7 from the message sent by the master to Bit 7 in the response.
3. Bit 7 is set indicating a fault occurred. Fault information is contained in the Access Control & Status Byte
4. This drive had an external fault in the Fault 3 location (Fault History Example 3).