Notes:
- If you want to mimic Point History using Trend extensions in the NIEs, be aware that each extension you add in the Metasys system counts as an object.
- Before adding Trend extensions for Point Histories, consider whether Point Histories are needed in the migrated Metasys system.
If the Metasys N1 Network object’s HISTORY_ATTR is true, a Metasys system Trend configured as follows is created. Point History is migrated as a Metasys system event trend, similar to Trend Migration, with fixed parameters as listed in Table 1.
|
Metasys System Trend Object Configuration Attribute Name/Type |
Metasys N1 Network Point History Configuration Variable/Type |
Notes |
|---|---|---|
|
Buffer_Size/Unsigned16 |
48 or 10 |
NCM has 48 samples for AI, ACM, and AD; 10 for all others. |
|
Log_Interval/Unsigned32 |
0 for binaries/multistates1800 seconds for analogs |
Set the trend to be Change of Value (COV)-based for binaries/multistates. Set the trend to be sampled every 30 minutes for analogs. |
|
Input_Reference/Structure |
/system object name. PRESENT_VALUE_ATTR |
Convert to reference (match as best you can the attribute number). |