Standard Items
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See Common Modbus OPC Items. In addition to the common items, the Modbus Block History protocol also has the following Extended items:
Modbus Block History Extended Items
| Item | Data Type | Description |
|---|---|---|
| GCWrite/Txn | Used for automated gas quality download. | |
| LastDailyRecord/n | Date | Timestamp of the last daily record retrieved from meter number “n”. |
| LastEventRecord/n | Date | Timestamp of the last event record retrieved from meter number “n”. |
| LastHourlyRecord/n | Date | Timestamp of the last hourly record retrieved from meter number “n”. |
| LastRTUConfigRead | Date | Timestamp of the last RTU configuration read. |
| LastRTUConfigWrite | Date | Timestamp of the last RTU configuration write. |
| MoveDaily/1 | I2 | Move the daily history retrieval pointer for meter run 1. Write a negative number to move the pointer back in time, a positive number to move the pointer forward in time. The written value represents the number of days to move. |
| MoveHourly/1 | I2 | Move the hourly history retrieval pointer for meter run 1. Write a negative number to move the pointer back in time, a positive number to move the pointer forward in time. The written value represents the number of hours to move. |
| ResetDaily/1 | BOOL | Erase the daily history retrieval pointer (and re-collect all daily history during the next retrieval). |
| ResetHourly/1 | BOOL | Erase the hourly history retrieval pointer (and re-collect all hourly history during the next retrieval). |
| RetrieveHistory | I2 | Retrieve enabled history. |
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