Rockwell-automation 1336T Function Block Prog. Manual, Series A/B Bedienungsanleitung PDF herunterladen (Seite 37)

2–3System 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

alue

00 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 1Block 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.

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Rockwell-automation 1336T Function Block Prog. Manual, Series A/B Bedienungsanleitung Seite 37