使用photoeyes的blocked procedure和cleared procedure,例如: w) S# i, _$ k, C
begin Conveyor.Photoeyes1 blocked procedure; z& g B' ]9 p( o6 W( s
if the load color = red then begin3 l. j' Z8 J* d) O$ r
travel to ........2 I' ]8 C: R; g. n* t3 J
end1 J8 r* `8 Z4 V
end% T3 A( b6 S7 s; E1 E9 k; v; w0 A