Function Block: ModbusChannel
Library: IoDrvModbus
This function block starts the execution of a single configured Modbus channel.
Table 21. Inputs (VAR_INPUT)
Name | Data Type | Initial Value | Description |
|---|
Slave
| ModbusSlaveComPort
| | |
xExecute
| BOOL
| | Rising edge: The action starts. Falling edge: The outputs are reset when a falling edge occurs before the function block has ended the action. The outputs behave as usual and are reset only if the action is ended or has been aborted (xAbort), or if an error has occurred. In this case, the corresponding output values (xDone, xError, iError) exist at the outputs for exactly one cycle. |
xAbort
| BOOL
| | TRUE: The action is aborted immediately and all outputs are set to their initial values.
|
iChannelIndex
| INT
| | The channel index to be executed. An invalid index leads to xError = TRUE (without Modbus-specific error code). |
Table 22. Outputs (VAR_OUTPUT)
Name | Data Type | Initial Value | Description |
|---|
xDone
| BOOL
| FALSE
| TRUE if a request was ended successfully
|
xBusy
| BOOL
| FALSE
| TRUE while the request is being processed
|
xError
| BOOL
| FALSE
| TRUE if a request was ended with errors
|
xAborted
| BOOL
| FALSE
| TRUE when the request has been aborted by the user
|
ModbusError
| MB_ErrorCodes
| | Current error; defined in the MB_ErrorCodes enumeration. |