AcroBasic Program Priority and Timing

Products: ACR9000, 9030,9040,9600,9630,9640, Aries CE, IPA

16 AcroBasic programs are available for use in ACR controllers.  In the ACR9xxx's and IPA, Programs 0-7 are high priority and 8-15 are low priority. In the AriesCE Program 0 is high priority, 1-15 are low priority.

Controller Type	High Priority Programs	Low Priority  Programs
IPA	0 - 7	8 - 15
ACR9xxx(all variants)	0 - 7	8 - 15
Aries Controller	0	1 - 15

High priority programs each have a dedicated time slice, where the low priority programs share a time slice. Communications also have a dedicated high priority task. Each time slice is 1ms, within that time the programs will execute anywhere from 1-10 lines of code before switching to the next program in the queue.

An example of the operation order where 0-9 are all being used would proceed as follows:

• Programs will only utilize their time slices when they are actually running.
• The program priorities are fixed in the controller, there is no provision for adjusting the priorities for the user. 
• DWL statements in low priority programs will cause the entire low priority slice to DWL
• INH statements in low priority programs will inhibit the entire low priority slice
• PROG15 is used by the ACR-View to store the configuration. Users should avoid using this program for other purposes.