Struktury automatizace průmyslového podniku
Struktury automatizace průmyslového podniku Struktury automatizace průmyslového podniku
30.9.2013 Types of Scans • Periodic task (periodická úloha) Like the continuous task, a periodic task executes all of its code from top to bottom. However, when a periodic task completes its scan, it waits a preconfigured time interval before restarting. program scans 1. A periodic task is always required for all numeric control algorithms, e.g. PID controller. 2. The periodic task lets you control a process that might occur at a significantly faster rate than the normal scan of the continuous task can attain. 3. In a periodic task, we must insert I/O instructions if we need actual data, otherwise it uses I/O data of the continues task. 36 Types of Scans • Event task (úloha řízená událostí, přerušeni) Lets you execute a piece of code based on the detection of some incident that occurs in the control system. Events Program scans 1. The event task either immediately take control at a high priority 2. But interrupts are potentially dangerous sources of errors 37 18
30.9.2013 Continues, Periodic, and Even Tasks • Picture taken from Rockwell Automation: Using Event Tasks with Logix5000 Controllers, Publication LOGIX-WP003A-EN-P June, 2003, page 15 38 Přehledné programovací jazyky Function Block Diagram (FBD) graphical languages Sequential Flow Chart (SFC) AUTO DI CALC1 CALC PUMP START STEP V ACT IN1 OUT >=1 MAN_ON IN2 DO V T1 STEP A T2 N D ACTION D1 D1_READY ACTION D2 D2_READY Ladder Diagram (LD) CALC1 STEP B T3 N D ACTION D3 D3_READY ACTION D4 D4_READY AUTO CALC PUMP ACT MAN_ON IN1 IN2 OUT textual languages Structured Text (ST) VAR CONSTANT X : REAL := 53.8 ; Z : REAL; END_VAR VAR aFB, bFB : FB_type; END_VAR Instruction List (IL) A: LD %IX1 (* PUSH BUTTON *) ANDN %MX5 (* NOT INHIBITED *) ST %QX2 (* FAN ON *) bFB(A:=1, B:=‘OK’); Z := X - INT_TO_REAL (bFB.OUT1); IF Z>57.0 THEN aFB(A:=0, B:=“ERR”); ELSE aFB(A:=1, B:=“Z is OK”); END_IF http://www.isagraf.com 39 19
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30.9.2013<br />
Continues, Periodic, and Even Tasks<br />
• Picture taken from Rockwell Automation: Using Event Tasks with Logix5000 Controllers,<br />
Publication LOGIX-WP003A-EN-P June, 2003, page 15<br />
38<br />
Přehledné programovací jazyky<br />
Function Block Diagram (FBD)<br />
graphical languages<br />
Sequential Flow Chart (SFC)<br />
AUTO<br />
DI<br />
CALC1<br />
CALC<br />
PUMP<br />
START STEP<br />
V<br />
ACT<br />
IN1 OUT >=1<br />
MAN_ON<br />
IN2<br />
DO<br />
V<br />
T1<br />
STEP A<br />
T2<br />
N<br />
D<br />
ACTION D1 D1_READY<br />
ACTION D2 D2_READY<br />
Ladder Diagram (LD)<br />
CALC1<br />
STEP B<br />
T3<br />
N<br />
D<br />
ACTION D3 D3_READY<br />
ACTION D4 D4_READY<br />
AUTO<br />
CALC<br />
PUMP<br />
ACT<br />
MAN_ON<br />
IN1<br />
IN2<br />
OUT<br />
textual languages<br />
Structured Text (ST)<br />
VAR CONSTANT X : REAL := 53.8 ;<br />
Z : REAL; END_VAR<br />
VAR aFB, bFB : FB_type; END_VAR<br />
Instruction List (IL)<br />
A: LD %IX1 (* PUSH BUTTON *)<br />
ANDN %MX5 (* NOT INHIBITED *)<br />
ST %QX2 (* FAN ON *)<br />
bFB(A:=1, B:=‘OK’);<br />
Z := X - INT_TO_REAL (bFB.OUT1);<br />
IF Z>57.0 THEN aFB(A:=0, B:=“ERR”);<br />
ELSE aFB(A:=1, B:=“Z is OK”);<br />
END_IF<br />
http://www.isagraf.com 39<br />
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