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Activities are the basic building blocks of the Process Flow module. This topic will explain some important concepts about adding and connecting activities to your process flows. This topic will also explain different methods for adding and connecting activities. Be aware that Tutorial 1 - Process Flow Basics will provide a hands-on, step-by-step approach to all the different methods for adding and connecting activities.

This topic will cover the following topics:

• About connectors and Stacked Blocks
• Number of Outgoing connectors
• Adding and Connecting Activities from the Process Flow Library
• Adding and Connecting Activities Using the Quick Library
• Inserting an Activity in the Middle of a Stacked Block
• Copying and Pasting Activities or Stacked Blocks
• Adding Outgoing connectors
• Removing connectors and Separating Stacked Blocks

About connectors and Stacked Blocks

One of the important things to understand are the similarities and differences between connectors and stacked blocks. A connector is a connection between two activities, as shown in the following image:

During a simulation run, tokens will use connectors to go from one activity to the next downstream activity. Some activities allow more than one outgoing connector, but many do not.

A stacked block is a set of activities that have been snapped together into one movable block, as shown in the following image:

Stacked blocks let you easily link a set of activities into a single sequence of steps, making it easy to move and edit them as if they were one block. When activities are linked together in a stacked block, they are automatically connected as though each activity were connected with connectors. In other words, these two process flows will function identically:

You can create stacked blocks through the object library as explained in Adding and Connecting Activities from the Process Flow Library or you can drag an activity above or below another activity to snap them together.

Number of Outgoing connectors

Most activities can only have one outgoing connection because they usually implement a very simple piece of logic on a token. In that case, the activity can simply send the token to the next downstream activity when that logic is complete. However, a few activities can have more than one outgoing connection. For example, a Decide activity can have more than one outgoing connection because tokens might need to be sent to a different downstream activity based on certain changing conditions. To check whether an activity allows more than one connection, read the reference page for the specific activity you're interested in.

You will need to understand how connectors work for activities that can have more than one outgoing connector. The following list explains a few important concepts to keep in mind:

• Each outgoing connection has a number (also sometimes called a rank) based on the order in which you created them. When you create an outgoing connection from one activity to another activity, this connection will automatically be assigned a number (rank). For example, the first outgoing connection you create will be assigned a rank of 1, the second will have a rank of 2, and so forth. You may have noticed that this is similar to how port connections work between objects in the 3D simulation model.
• The token will be sent to the next activity based on the number assigned to the outgoing connector. The underlying logic of the activity depends on the numbers (ranks) of the outgoing connectors. For example, if you wanted to send 75% of tokens to the activity connected to the first outgoing connector, you would send them to connector 1. If you wanted to send 25% to the activity connected to the second outgoing connector, you would send them to connector 2.
• You can re-rank outgoing connectors or assign names to connectors if needed. You can edit the activity's properties to change the ranks of the outgoing connectors or assign a name to a connector. You can also assign a name to a connector for easier reference if needed. Activities that allow for more than one outgoing connector will usually have a group of properties labeled connectors Out that can be used to manage the outgoing connectors. NOTE: If you need to refer to a connector's name in a command of some sort, make sure you put it in quotation marks (" ") so that the FlexSim system can recognize it as a string.

Adding and Connecting Activities from the Process Flow Library

There are several ways to add activities to a process flow. One way is to add an activity from the Process Flow Library:

1. Make sure that the left pane is open to the Library tab (not the Toolbox tab).
2. Click somewhere inside a process flow to make the process flow view active. The Library will change to show the process flow activities (instead of the standard FlexSim objects).
3. Drag an activity from the Library into the process flow.

If you drop an activity from the library onto another activity within the process flow view, the activities will be joined together by adding the new activity to the end of the block. Dropping an activity inbetween two activities in a block will insert the dropped activity in between the two activities.

You can also add activities from the library and immediately connect it to a stacked block:

1. Drag an activity from the Library into the process flow without releasing the mouse button.
2. While holding down the mouse button, drag the activity on top of another activity or stacked block and release the mouse. The activity will be appended to the end of the stacked block.

See Removing connectors and Separating Stacked Blocks for information about separating stacked blocks if needed.

Adding and Connecting Activities Using the Quick Library

You can also add and connect activities using the Quick Library, which is a condensed menu of the process flow activities, as shown in the following image:

If you want to add an activity to a blank area using the Quick Library inside a process flow:

1. Double-click in the process flow to open the Quick Library.
2. Click the icon for the activity you want to add.

If you want to add an activity to the end of a stacked block using the Quick Library:

1. Point your mouse on the bottom edge of an activity or stacked block. The mouse icon will change to a chain link.
2. Double-click the edge to open the Quick Library again.
3. Click the icon for the activity you want to add. The activity will be appended to the end of the stacked block.

See Removing connectors and Separating Stacked Blocks for information about separating stacked blocks if needed.

Inserting an Activity in the Middle of a Stacked Block

If you want to add an activity inside a stacked block:

1. Point your mouse to the line between two activities until the line turns yellow, as shown in the following image:

   

2. Double-click the line to open the Quick Library again.
3. Click the icon for the activity you want to add. The activity will be inserted in the middle of the stacked block.

Copying and Pasting Activities or Stacked Blocks

You can easily copy an activity or stacked block. When you copy and paste an activity or stacked block, it will automatically retain all the same settings from the original activity or stacked block. You can also easily copy activities or stacked blocks from one process flow to another in the same simulation model.

To copy an activity or stacked block:

1. Click the activity or stacked block to select it.
2. Use Ctrl+C to copy the activity.
3. Use Ctrl+V to paste the copied activity.

Adding Outgoing connectors

If you want to create an outgoing connector from one activity to another:

• Point your mouse on the bottom edge of an activity or block. The mouse icon will change to a chain link.
• Click the edge of the activity or block and, while holding down the mouse, drag the mouse toward the activity you want to connect. You'll notice a connector coming from the edge of the block to the mouse pointer.
• Release the mouse when it is connected to the activity. You can change the curvature or position of the connector by clicking on it and manipulating its curve handles if needed.

• You can also add a new activity to the end of a connector using the Quick Library:

  1. Point your mouse on the bottom edge of an activity or block. The mouse icon will change to a chain link.
  2. Click the edge of the block and, while holding down the mouse, drag it a little bit toward the bottom of the screen. You'll notice a connector coming from the edge of the block to the mouse pointer.
  3. When you release the mouse, the Quick Library will appear.
  4. Click the icon for the activity you want to add. The activity will be appended to the end of the stacked block, as shown in the following animated image:

     

  Removing connectors and Separating Stacked Blocks

  To remove a connector:

  1. Click the connector. It will turn yellow to indicate it is highlighted.
  2. Press the Delete key. The connector will disappear.

  To separate activities in a stacked block:

  1. Click anywhere inside the stacked block to select it. Its borders will turn yellow to indicate it is selected. You will also notice that some scissor icons will appear to the left in between the activities, as shown in the following image:

     

  2. Click the scissors icon between the two activities you want to separate. The stacked block will separate into two different blocks.