Modbus Block History OPC Items

Standard Items

See Common Modbus OPC Items. In addition to the common items, the Modbus Block History protocol also has the following 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.