FB_S7CommConnection

With the function block FB_S7CommConnection, a TCP/IP based connection to a Siemens S7 Controller can be established. It is possible to tell whether the connection was successfully established via the output bIsConnected. Errors concerning setting up the connection are displayed via the output bError and sErrorTxt.

Syntax

Definition:

VAR_INPUT
    bExecute     : BOOL;
    sIpAddr      : STRING(15);
    eCpuType     : E_S7COMM_CPUTYPE;
    nRack        : UINT;
    nSlot        : UINT;
END_VAR
VAR_OUTPUT
    bError       : BOOL;
    sErrorTxt    : STRING;
    bBusy        : BOOL;
    bIsConnected : BOOL;
END_VAR

Inputs

Name	Data type	Description
bExecute	BOOL	The connection to the S7 Controller is set up in case of a rising edge. The connection is disconnected in case of a falling edge.
sIpAddr	STRING(15)	IP address of the Siemens S7 Controller.
eCpuType	E_S7COMM_CPUTYPE	Type of Siemens S7 Controller
nRack	UINT	Rack ID of the S7 Controller. This can be obtained from the S7 device manager.
nSlot	UINT	Slot ID of the S7 Controller. This can be obtained from the S7 device manager.

Outputs

Name	Data type	Description
bError	BOOL	Switches to TRUE if an error occurs during execution.
sErrorTxt	STRING	Contains the error text in the event of an error.
bBusy	BOOL	TRUE until the function block has executed a command. As long as bBusy = TRUE, the function block will not accept any new commands.
bIsConnected	BOOL	TRUE, if the connection to the Siemens S7 Controller was established.

Methods

Name	Definition location	Description
AddRequest	Local	Adds a Single or CyclicRequest to the connection.

Requirements

Development environment	Target platform	PLC libraries to be integrated (category group)
TwinCAT v3.1.0	PC or CX (x86, x64)	Tc3_S7Comm (Communication)

Further Information

AddRequest