以下程序是在S7-300 FC里编写的,我是新手,不完全明白,请高手解释啊,越详细越好.谢谢了!

L P#DBX 0.0
LAR1

OPN "ACT"
L DBLG
L L#2
/D
strt: T #countr

A DBX [AR1,P#0.0]
= #H

A DBX [AR1,P#0.1]
= #SQ

A DBX [AR1,P#0.2]
= #XQ

A DBX [AR1,P#0.4]
= #PI

// A DBX [AR1,P#0.5]
// = #FltI

// A #FltI
// JNB _nxt

// SET
// R #PQ

// JU end

//_nxt: NOP 0

SET
A #H
JNB _001

SET
A #SQ
= #PQ

JU end

_001: NOP 0

SET
A #XQ
= #PQ

JU end

end: NOP 0

A #PQ
= DBX [AR1,P#0.3]

X #PQ
X #PI
= DBX [AR1,P#0.5]

+AR1 P#2.0

L #countr
LOOP strt