西门子高手解答

CALL #FBKey1 //FB110
wIKeyOn :="DB_PANEL".functen_key1 // evaluate keys DB110.DBW40
wIKeyOff :=
wMaskOff :=
wMaskJog :=W#16#FFFF
wBlock :="wKEYBLOCK1-16" //MW88
wFunctionFlag:="wFUNCT1-16" //MW98
wFunctionPuUp:="wPUFUNCT1-16" //MW14
wKeyFlag :="wKEY1-16" //MW78
mBlock :="M 10.0"

FB110程序如下:
接口:
IN:wIKeyOn
wIKeyOff
wMaskOff
wMaskJog
wBlock
OUT:wFunctionFlag
wFunctionPuUp
INOUT:wKeyFlag
mBlock
STAT:wEdgeOn
wEdgeOff
mAktiv
wPuUp
wPuDo
wEdgeFunction
wEdgeBlock
TEMP:wPulse
wTemp1
wPulsOnBlock
wPulsBlock

SEG1:edge generation
A #mAktiv
JC NW2
L #wBlock // edge evaluation "Block"
L #wEdgeBlock
XOW
AW
T #wPulsBlock // positive pulse "Block"
TAK
T #wEdgeBlock

L #wPulsBlock // keys that still be activ and have jogging function,
L #wIKeyOn // will switched on once more if "Block" is "1" again
AW
L #wMaskJog
AW
T #wPulsOnBlock

L #wIKeyOff // only Off - keys
INVI // "0" = OFF
L #wMaskOff // edge evaluation Off - keys
AW
L #wFunctionFlag // function = "1" ?
AW
L #wEdgeOff
XOW
AW
T #wTemp1 // pulses Off - keys
L #wIKeyOff
INVI
T #wEdgeOff

L #wFunctionFlag // evaluate only positiv edge of On-key
L #wMaskOff // if function not switched on already
AW
INVI
L #wIKeyOn // edge evaluation panel-keys / On - keys
AW
L #wEdgeOn
XOW
T #wPulse
AW
L #wPulsOnBlock // pulses ON if jogging keys und "Block" ok.
OW
T #wPuUp // positive pulses

L #wEdgeOn
L #wPulse
AW
L #wMaskOff // no pulses by separat off keys
INVI // of on keys
AW
L #wTemp1 // negative pulses of Off - keys
OW
T #wPuDo // negative pulses

L #wPulse // pulse "one key has changed the value"
L #wTemp1
OW
L #wPulsOnBlock
OW
T #wPulse

L #wPulse
L 0
==I
JC Ausw // jump to evaluation of "function"
L #wIKeyOn
T #wEdgeOn
L #wIKeyOff
T #wEdgeOff
SEG2:pulse evaluation
L 0
T #wFunctionPuUp // reset pulse output
L #wMaskJog // mask keys with On/Off function
L #wMaskOff
OW
INVI
L #wPuUp
AW
L #wKeyFlag
XOW
T #wKeyFlag // keys with On/Off function

L #wIKeyOff // Off key must not be actuated
INVI
L #wMaskOff // mask Off keys
AW
INVI
L #wMaskOff
AW
L #wMaskJog // mask keys with jogging function
OW
L #wPuUp
AW
L #wKeyFlag // set with PuUp
OW
T #wKeyFlag

L #wMaskJog // mask keys with jogging function
L #wMaskOff // mask Off keys
OW
L #wPuDo
AW
INVI
L #wKeyFlag
AW // reset with PuDo
T #wKeyFlag
SET
S #mAktiv // evaluation in next cycle
BEU

NW2: L #wFunctionFlag // save function
T #wTemp1

Ausw: L #wKeyFlag
L #wBlock // connect with flag "Block"
AW
T #wFunctionFlag // store function
T #wKeyFlag
L #wEdgeFunction // positive edge evaluation
XOW // of the function
AW
T #wFunctionPuUp // pulse output
TAK
T #wEdgeFunction // set edge flags

AN #mAktiv // evaluation "switching condition not fulfilled"
BEC
SET
R #mAktiv
L #wTemp1 // check function whether has changed
XOW
INVI
T #wTemp1
L #wPuUp // compare with positve pulses
AW
JP m1
L #wMaskJog // remove the negative pulse of the On keys
L #wMaskOff
OW
L #wPuDo
AW
L #wTemp1 // compare with negative pulses
AW
JP m1
BE
SET
m1: S #mBlock // function is blocked




这就是FB110的调用全过程,希望哪个高人帮我解答哈,先XOW再AW,是为了产生脉冲吗?静态变量的使用不是很清楚,感觉很难读懂,谢谢