reads a region of Siemens S7 PLC memory.
The Siemens S7 Memory Block Tag
reads a region of Siemens S7 PLC memory.
The Siemens S7 Memory Block Tag supports the configuration properties of the Byte Register Block Tag plus these properties:
| Property | Type | Version | Description |
|---|---|---|---|
| ScanInterval | TIME | 1.4 | The interval between each read. See Interval and Offset for information on how timed activities are scheduled. |
| ScanOffset | TIME | 1.4 | The offset added to the ScanInterval to get the actual read time. See Interval and Offset for information on how timed activities are scheduled. |
| PLC | Reference | 1.4 | The Siemens S7 PLC Tag where the Memory Block is located. |
| MemoryAddress | STRING | 1.8 |
The memory address of the first byte of the register block. See Siemens S7 PLC Data Address for information on how this field is formatted. Click the Browse button  to access the memory address editor.
|
| ByteCount | UINT | 1.4 | The number of bytes to read from the PLC. |
The Siemens S7 Memory Block Tag supports these tag commands:
| Tag Command | Version | Description |
|---|---|---|
| Refresh | 1.4 | Requests an immediate read of the data from the PLC. |
Note: Event triggered data reads (from the Refresh Tag Command) and periodic data reads (defined by the ScanInterval property) are independent. You can use the Refresh Tag Command, or the ScanInterval property, or both to determine when the data is read from the PLC.
The Siemens Memory Block Tag builds on the features of these tag types:
To learn how activities are scheduled using Interval and Offset.
To learn how to choose a data location in a Siemens S7 PLC Tag.
To learn about the I/O Analog Data Point Tag that can be associated with the Siemens S7 Memory Block Tag.
To learn about the I/O Digital Data Point Tag that can be associated with the Siemens S7 Memory Block Tag.
To learn about the I/O String Data Point Tag that can be associated with the Siemens S7 Memory Block Tag.
To learn about the I/O Word Data Point Tag that can be associated with the Siemens S7 Memory Block Tag.
I/O Double Word Data Point Tag
To learn about the I/O Double Word Data Point Tag that can be associated with the Siemens S7 Memory Block Tag.
For an overview of the Siemens S7 Driver.
To learn about properties common to all Byte Register Block Tags.
For the meaning of terms used in Fernhill SCADA.