question

You cannot close an output port number!
There exists a command, BUT it is not allowed to use it for this purpose.

You may consider other solutions.

A. You can add queues as interfaces between PM_3 and PM_3_1 and Layout_Control. Each Queue has got a capacity of one. These additional queues can set to close there input, which resolves in, that PM_3 is sending no more products to them.

B. You can adjust a source source code in Send To function of PM_3. If you open the source code editor of this function in processor, then you find in it for the picklist option “first available“ a code line

return 0;

You can rework it so, that this return command evaluates a label at your processor. This label can you set to different values which explicitly change the output port behavior.

• Value of 1 sends items to Output Port 1
• Value of 2 sends items to Output Port 2
• Value of 0 sends items to first available Ports.

You add a number label at your processor. You call it as you like, for example “rule”. You set label by picklist option or by command in a function of your Processor.

setlablenum(current,”rule”,2);

The return line looks like

return getlabelnum(current,”rule”);