Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 37)

2–3 System Component Detail
1336 FORCE — 5.9 August 1995
Within the drive, the execution list is stored as an array of words.
Internally, the execution list for the sawtooth example can be
represented as follows:
Event 1 ID = 01 Type = Limit 010C
Hex Value
0 0 0
0 0 0
0 0 0
Stored in drive
Dec Hex
=12 =0C
Event 2 ID = 02 Type = SRFF 0216
Dec Hex
=22 =16
Event 3 ID = 03 Type = Multiplexer 0315
Dec Hex
=21 =15
Event 4 ID = 04 Type = Ratelim 0413
Dec Hex
=19 =13
The same execution list using a PLC data table is shown here:
0 1 2 3 4 5 6 7 8 9
N57:0 0000 8F03 4000 0000 0004 0A4A 010C 0216 0315 0413
ID Type
Event 1 Block Transfer Header Information Event 2 Event 3 Event 4
Once you complete an execution list, you need to download it to the
drive and compile it to create an application. Only one execution list,
or application, is operating in a drive at any given time.
When the drive enables a function block application, the events are
executed every 20 milliseconds, regardless of how long it actually
takes to execute the application. For example, if it takes the
processor 5 milliseconds to execute your application, the drive’s
processor will not start to execute the application again until the full
20 milliseconds have elapsed. This is referred to as a 20 millisecond
task interval.