FB_IEC870_5_102TBufferCtrl
This function block can be used to manipulate the content of the TX/RX data buffer, which is used for the communication via the IEC60870-5-102 low-level interface.
The function block features the following tasks:
- RxRemoveObj (removes the oldest FIFO entry from the RX FIFO);
- RxReset (clears all the RX FIFO entries, resets the RX FIFO);
- TxAddObj (inserts a new FIFO entry into the TX FIFO);
- TxReset (clears all the TX FIFO entries, resets the TX FIFO)
The content of the TX/RX data buffer can be changed by calling the actions listed above.
VAR_IN_OUT
VAR_IN_OUT
buffer : ST_IEC870_5_102TBuffer;
END_VARbuffer: TX/RX data buffer. The TX/RX buffer parameters (like e.g. asduSize ) have to be configured before using.
VAR_INPUT
VAR_INPUT
putObj : ST_IEC870_5_102AOGen;
END_VARputObj: Data unit (ASDU) that is to be transmitted.
VAR_OUTPUT
VAR_OUTPUT
getObj : ST_IEC870_5_102AOGen;
bOk : BOOL;
END_VARgetObj: Received data unit (ASDU).
bOk: This variable becomes TRUE if a new entry was successfully added to or removed from the FIFO. This variable becomes FALSE if the buffer overflows and if it is not possible to remove an entry because the FIFO is already empty.
Example (low-level interface): IEC 60870-5-102 central station (master);
Requirements
|
Development environment |
Target system type |
PLC libraries to be linked (category group) |
|---|---|---|
|
TwinCAT v3.1.4012.0 |
PC oder CX (x86, x64, ARM) |
Tc2_IEC60870_5_10x (Communication->IEC60870) |