Target model in DCS

As you can see in the picture.

0 - disabled
-1 - robot
-2 - tool

So if there is a:
0, target model is not used.
-1 means that DCS safety zone will stop the robot if "robot" will "hit" the DCS zone (one of the robot axis)
-2 is selected, robot will stop when modeled tool will interfere with DSC. (if I'm not mistaken, if you have a model of a tool defined in User Model, you use this number to use correct tool definition, so instead of -2, you would use whatever number you have in User Model)

If you only have 1 tool then you use that number directly.

-2 is used when you have a tool changer and need to change the active user model.

Sent from my SM-G930V using Tapatalk

Up to three targets can be checked against a zone
for each target you must define the target model:

0 Disables the target (it will not be checked).
1 to 16 Checks a user defined model.
-1 Checks the robot model of the target motion group .
-2 Checks the tool model of the target motion group.

(0:Disable,-1:Robot,-2:Tool)

Target model 1-3:
Used to set the number of the target shape model that is checked.
A maximum of three shape models can be defined.
When set to 0, the target model is disabled.
When set to 1-16, the user model is checked.
When set to -1, the robot model of the target motion group is checked.
When set to -2, the tool model of the target motion group is checked.