FB_SendRecvMsg: Send and Receive Message Function Block
The following graphic shows the pin diagram of the function block FB_SendRecvMsg:
The function block FB_SendRecvMsg sends and receives user-defined messages. It sends a message on a serial line and then waits for a response. It is also possible to either send without waiting for a response or to receive a message without sending one. This function should be used with an ASCII manager.
The table describes the input variables of the function block in the TwidoEmulationSupport library:
|
Input |
Data type |
Description |
|---|---|---|
|
i_xExecute |
BOOL |
The function is executed on the rising edge of this input. NOTE: When i_xExecute is set to TRUE at the first task cycle in RUNNING after a cold or warm reset, the rising edge is not detected. |
|
i_xAbort |
BOOL |
Stops the ongoing operation at the rising edge. |
|
i_iLink |
INT |
Indicates the port used to communicate: o1 = Serial port 1 o2 = Serial port 2 |
|
i_iTimeout |
INT |
Set the maximum time to wait to receive a response. Specified in ms. A value of 0 means no timeout is enforced. |
|
i_iQuantityToSend |
INT |
Number of objects to send. |
|
i_pbyBufferToSend |
POINTER TO BYTE |
Address of the buffer in which object values to send are stored. The first 2 words are control words. |
|
i_iSizeRecvBuffer |
INT |
Number of objects to receive. |
|
i_pbyBufferToRecv |
POINTER TO BYTE |
Address of the buffer in which received object values are stored. |
The table describes the output variables of the function block in the TwidoEmulationSupport library:
|
Output |
Data type |
Description |
|---|---|---|
|
q_xDone |
BOOL |
q_xDone is set to TRUE when the function is completed successfully. |
|
q_xBusy |
BOOL |
q_xBusy is set to TRUE while the function is ongoing. |
|
q_Aborted |
BOOL |
q_Aborted is set to TRUE when the function is stopped with the i_xAbort input. |
|
q_xError |
BOOL |
q_xError is set to TRUE when the function stops because of a detected error. |
|
q_etCommError |
SEN.CommunicationErrorCodes |
q_etCommError contains the value of communication error codes SEN.CommunicationErrorCodes. |
|
q_etOperError |
SEN.OperationErrorCodes |
q_etOperError contains the value of operation error codes SEN.OperationErrorCodes. |
|
q_iQuantiyRecv |
INT |
Number of received objects |
