FB_PLCDBReadEvt
Function block for reading records from a database.
Syntax
Definition:
FUNCTION_BLOCK FB_PLCDBReadEvt
VAR_INPUT
sNetID: T_AmsNetID := '';
tTimeout: TIME := T#5S;
END_VAR
VAR_OUTPUT
bBusy: BOOL;
bError: BOOL;
ipTcResult: Tc3_EventLogger.I_TcMessage
END_VAR
Inputs
Name | Type | Description |
|---|---|---|
sNetID | T_AmsNetID | AMS network ID of the target device at which the ADS command is directed. |
tTimeout | TIME | Indicates the time before the function is cancelled. |
Outputs
Name | Type | Description |
|---|---|---|
bBusy | BOOL | TRUE as soon as a method of the function block is active. |
bError | BOOL | TRUE when an error occurs. |
ipTcResult | Message interface from the TwinCAT 3 EventLogger, which provides details on the return value. |
Properties
Name | Type | Description |
|---|---|---|
nRecords | UDINT | Outputs the maximum number of records that could be collected depending on sDBSymbolName. |
eTraceLevel | Specifies the weighting of the events. Only events with a weighting higher than this value are sent to the TwinCAT system. |
Methods
Name | Definition location | Description |
|---|---|---|
Local | Reads a specified number of records from a database table with the standard table structure specified by Beckhoff. | |
Local | Reads a specified number of records from a database table with any table structure. |
Requirements
Development environment | Target platform | PLC libraries to include |
|---|---|---|
TwinCAT v3.1 Build 4022.20 | PC or CX (x86) | Tc3_Database |