PLC_ReadSymInfo
The function block PLC_ReadSymInfo can be used to determine information regarding the symbols (variables) of a PLC run-time system.
Inputs
VAR_INPUT
NETID : T_AmsNetId;
PORT : T_AmsPort;
START : BOOL;
TMOUT : TIME := DEFAULT_ADS_TIMEOUT;
END_VARName | Type | Description |
|---|---|---|
NETID | T_AmsNetID | The network address of the TwinCAT computer whose symbol information is to be determined can be specified here. For the local computer an empty string may be specified. |
PORT | T_AmsPort | The port number of a PLC runtime system. |
START | BOOL | The function block is enabled by a positive edge at this input. |
TMOUT | TIME | Time-out period that may not be exceeded when executing the ADS command. |
Outputs
VAR_OUTPUT
BUSY : BOOL;
ERR : BOOL;
ERRID : UDINT;
SYMCOUNT : UDINT;
SYMSIZE : UDINT;
END_VARName | Type | Description |
|---|---|---|
BUSY | BOOL | When the function block is enabled, this output is set and remains set until a feedback is received. |
ERR | BOOL | If an error should occur during the transfer of the command, then this output is set once the BUSY output was reset. |
ERRID | Returns the error code, if the ERR output is set. | |
SYMCOUNT | UDINT | The number of symbols in the PLC runtime system |
SYMSIZE | UDINT | Length of the data, in bytes, in which the symbol information is stored. |
Requirements
|
Development environment |
Target platform |
PLC libraries to be integrated (category group) |
|---|---|---|
|
TwinCAT v3.1.0 |
PC or CX (x86, x64, ARM) |
Tc2_Utilities (System) |