Configuration of the Publisher

In the TwinCAT System Manager, a new box is added for the Publisher under the RT Ethernet device.

Insert a Publisher Box

A Publisher box must be added under the RT Ethernet device.

Insert a Network Variable

The network variables are inserted underneath the box. Enter a name (nCounterPub in the sample) and a data type (UINT32 in the sample, corresponding to UDINT).

Inputs and outputs are created underneath the added variables.

The FrameState input under the box indicates the current status of the sent Ethernet frames.

The following values are possible for the FrameState:

Short description	Value	Description
Not sent (frame skipped)	0x0001
Error (frame oversized)	0x0001	The maximum size of an Ethernet frames was exceeded. The linked variable should be smaller.

A Control Word can be written in the FrameCtrl output under the box.

The following values are possible for FrameCtrl:

Short description	Value	Description
Disable sending	0x0001	Sending of a frame is interrupted. Sending of the frame does not restart until the value is 0 again.

The VarState input under the network variable indicates the current status of the network variable.
The following values are possible for VarState:

Short description	Value	Description
Not sent (variable skipped)	0x0001

A Control Word can be written in the VarCtrl output under the network variable.

The following values are possible for FrameCtrl:

Short description	Value	Description
Disable publishing	0x0001	Sending of the network variable is interrupted. Sending of the network variable does not restart until the value is 0 again.

Mappings

The network variable of the Publisher can be mapped to any output variable with a suitable data type. In the sample, the network variable is linked to the output variable of a PLC.