Periodic tasks coming up with warnings

[Mgw1970]

The original file uses a STI and I/O interrupts {micrologix1500}, but when I create them as a periodic tasks in studio5000 I get warnings routine doesn't have an association with main program. Is this normal or did miss something setting up the task? Thanks!

[plvlce]

Did you schedule any program(s) within the task properties? Have you assigned a main routine in the program properties? Are all non-main routines called by the main routine (directly or indirectly)?

[Operaghost]

You'll need to familiarize yourself with Tasks, Programs and Routines. In simple terms:

• A Routine is similar to LAD routines in the MicroLogix. However, instead of LAD2 that executes automatically, you must define a "main" routine. This will be the routine that executes automatically whenever that task executes. Other routines would be subroutines or a fault routine. Logic is always contained in Routines. Tasks and Programs do not contain logic themselves.
  
• A Program is a grouping of related routines within a Task. Sort of like a folder. A Task may have multiple Programs. Each Program has its own Main routine and subroutines. You can have up to 65,000 routines in each Program.
  
• A Periodic Task is essentially a container where you define how often it will execute its Programs and in what order the programs will run. The number of Programs depends a little on the firmware of the controller. I believe you can have 1000 Programs per Task. I think that used to be 32 when the Logix 5000 was first introduced. Some CompactLogix are limited to 16.
  
  The number of Tasks will vary based on your controller. But I believe 32 is the maximum. Only one task may be defined as the continuous task.

Obviously, that is a very simple explanation. But that should get you started at least.

[Mgw1970]

Originally Posted by Operaghost

You'll need to familiarize yourself with Tasks, Programs and Routines. In simple terms:

• A Routine is similar to LAD routines in the MicroLogix. However, instead of LAD2 that executes automatically, you must define a "main" routine. This will be the routine that executes automatically whenever that task executes. Other routines would be subroutines or a fault routine. Logic is always contained in Routines. Tasks and Programs do not contain logic themselves.
  
• A Program is a grouping of related routines within a Task. Sort of like a folder. A Task may have multiple Programs. Each Program has its own Main routine and subroutines. You can have up to 65,000 routines in each Program.
  
• A Periodic Task is essentially a container where you define how often it will execute its Programs and in what order the programs will run. The number of Programs depends a little on the firmware of the controller. I believe you can have 1000 Programs per Task. I think that used to be 32 when the Logix 5000 was first introduced. Some CompactLogix are limited to 16.
  
  The number of Tasks will vary based on your controller. But I believe 32 is the maximum. Only one task may be defined as the continuous task.

Obviously, that is a very simple explanation. But that should get you started at least.

Thanks! I went back through and got the tasks/routines situated correctly.