Description
DRV.NVCHECK returns a CRC checksum of all the drive's NV parameters. This parameter can be used to detect changes in parameters.
In some applications a controller may need to confirm the AKD2G drive contains an expected set of drive parameters. Reading and checking all the drive parameters individually is viable but would be a long process involving many reads over the network. DRV.NVCHECK is a checksum on all the NV parameters and this parameter can be read in a single transaction. Under most circumstances DRV.NVCHECK will return the same number if all the drive parameters match. If any of the drive parameters are changed then DRV.NVCHECK returns a different value.
-
- As the checksum calculated is a 32-bit number there is a 1 in 232 chance that the same value will be returned even if one or more drive parameters have been modified. Updating firmware versions can also affect the value returned by DRV.NVCHECK as new drive parameters may have been added. To fully guarantee all parameters between two drives are equal, a textual difference should be performed between the DRV.NVLIST output of the drives being compared.
Versions
| Action | Version | Notes |
|---|---|---|
| Implemented | 02-00-00-000 | |
| Modified | 02-14-01-000 | Updated from 16 to 32-bit checksum |
General Information
|
Type |
Read Only |
|
Units |
None |
|
Range |
0 to 4,294,967,295 |
|
Default Value |
N/A |
|
Data Type |
Integer |
|
Stored in Non-Volatile Memory |
No |
Variants Supported
All variants are supported.
Industrial Ethernet Information
|
Command |
Index |
SubIndex |
Data Type |
Units |
Float Scale |
Access |
PDO Mappable |
|---|---|---|---|---|---|---|---|
|
DRV.NVCHECK |
3000h |
03h |
Unsigned32 |
- |
- |
Read only |
No |
|
ID |
Instance |
Attribute |
Name |
Data Type |
Access |
User Mappable |
|---|---|---|---|---|---|---|
|
2009 |
1 |
2009 (0x7d9) |
DRV.NVCHECK |
Unsigned32 |
Read Only |
Yes |
|
Parameter |
PNU |
Data Type |
Access |
Units |
|---|---|---|---|---|
|
DRV.NVCHECK |
2009 |
Unsigned32 |
Read Only |
- |
