cannot add or remove terminals in subvi

[Wagonlit]

I used the built-in LabVIEW 'Create SubVI' function to generate several subVIs. Now when I go into the subVIs I cannot add or remove any terminals. Those options are greyed out. Please help!

[James.M]

Can you right-click and go to Patterns to select a new pattern? You can only add or remove terminals if there is a similar pattern to accomodate the change.

I very rarely need more terminals, so if you're adding or removing terminals alot, you may need to work on your subVI coding practices.

[Sam_Sharp]

As James pointed out - if you have a lot of terminals on your SubVI you might have hit the limit (i.e. the largest pattern available).

You should try to keep to the 4-2-2-4 pattern 100% of the time by using clusters to group data items together.

[Wagonlit]

This is my first go at programming from scratch in LabVIEW. I was a user once 10 years ago and only did some very minor editing to a few VIs then...

I am currently trying to replace 16 individual output terminals from a VI with 1 output cluster terminal to reduce all the wires I'm connecting.

Postnote:

I figured out my problem. I had disconnected all terminals (this option is not greyed out) but I was still not able to add terminals to the blank pattern. The pattern in use was the last pattern on the list, so I could not add any more terminals I guess. When I switch to a smaller pattern template the 'Add terminal' is active and sometimes the 'Remove terminal' is active. 

I also erroneously thought that somehow adding new inputs/outputs to the subVI was simply linked to just adding terminals to that connector block and then I could right-click there and choose which things I wanted to link up. Now I know I just have to click directly on what I want to link using the wire tool.

I was getting pretty frustrated at something I knew had to be simple... unfortunately I'm setup only with the cDAQ where I'm at and even though I have an internet connection I don't have audio so it is more difficult to follow online tutorials. I had also looked into the help but was struggling to find the answer.

Thanks for your fast reply.

[James.M]

So it sounds like you have it figured out now. I would highly suggest finding a way to watch some basic tutorials if you intend on programming in LV from scratch for more than the next week. You'll spend a lot of time trying to debug or figure out little things than the tutorials would take.

"Give me six hours to chop down a tree and I will spend the first four sharpening the axe."  - Abraham Lincoln

Here are some free training tools primarily focused on LabVIEW and NI hardware to help get started.

NI Learning Center

NI Getting Started

-Hardware Basics

-MyRIO Project Essentials Guide (lots of good simple circuits with links to youtube demonstrations)

-LabVEW Basics

-DAQ Application Tutorials

-cRIO Developer's Guide

Learn NI Training Resource Videos

3 Hour LabVIEW Introduction

6 Hour LabVIEW Introduction
Self Paced training for students
Self Paced training beginner to advanced, SSP Required
LabVIEW Wiki on Training

[Hatef.fouladi]

I have to recommendation i think they will helpful

1)for making subvi open your code select all by ctrl+a and go to tools bar /edit/ cerate subvi 

then subvi with terminals will be create

2) if you hit max channel limit for terminals use cluster to reduce number of channel for make terminals

[James.M]

Hatef, that doesn't help much if he already has the subVIs that he's trying to alter. Your tip doesn't save any time in this case and is just listing off a way that subVIs can be created.

[Hatef.fouladi]

thank you james I think it is better to take look at this subvi to find a problem 
Wagonlit, could you attach this vi to find what  the problem is?