In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Steel wrote:

The numbers following "SUB" and "FUNC" are the Minimum, maximum number of parameters to pass to the sub/function...

WAIT_MS SUB 1,2
1 = there is at least 1 parameter that you are passing to the sub routine
2 = there is at Most 2 paramters that you are passing to the sub routine
With this declaration, when you are writing your code you can pass either 1 or 2 parameters to the sub and the sub.

Looking at a made-up example:
GET_TEM FUNC 3,5
3 = You have made it so that this sub requires at least 3 variables to be passed
5 = You have made it so that this sub requires at most 5 variables to be passed
If you only pass it 1 variable in your code you will encounter problems, If you pass it 6 variables you will also encounter problems.

You can pass it 3,4,or 5 variables.

The number sets up the 'Fence' for the 'shepard's pen', and your variables (parameters) are the sheep.

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