Rockwell-automation 1771-IFE ANALOG INPUT MODULE Uživatelský manuál Strana 28

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3–2 Module Programming
>,53-+=387 E /,;>+;B 
The PLC-2 program example regulates when each block transfer will
be initiated to eliminate problems caused by limited regulation of
bidirectional block transfers. Both storage bits are needed, as shown
in the example, to accomplish this task in all PLC-2 systems, local or
remote, with long or short program scans. Therefore, the program as
shown is the minimum required. Note that PLC-2 processors that do
not have the block transfer instruction must use the GET-GET block
transfer format which is outlined in Appendix E.
Figure 3.1
PLCĆ2 Family Sample Program Structure
58-4#;+7<0/;!/+.
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58-4#;+7<0/;&;3=/
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@;3=/87+=36/.,+<3<(8>-+7+5<8></+7B<=8;+1/,3=376/68;B
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"=8;+1/
"=8;+1/
E
Rung 1
58-4 =;+7<0/; ;/+. ,>00/; =2/
035/E=8E035/ 68?/ 37<=;>-=387 285.< =2/
,58-4 =;+7<0/; ;/+. #! .+=+ 035/ 
>7=35 =2/ 9;8-/<<8; -2/-4< =2/ .+=+
37=/1;3=B 0 =2/ .+=+ @+< <>--/<<0>55B
=;+7<0/;;/. =2/ 9;8-/<<8; /7/;13C/<
=2/ #! .87/ ,3= 373=3+=371 + .+=+
=;+7<0/; =8 =2/ ,>00/; 035/ ! 08; ></ 37
=2/ 9;81;+6
0 =2/ .+=+ 3< -8;;>9=/. .>;371 =2/ #!
89/;+=387 =2/ #! .87/ ,3= 3< 78=
/7/;13C/. +7. .+=+ 3< 78= =;+7<0/;;/. =8
=2/ ,>00/; 035/ 7 =23< -+</ =2/ .+=+ 37
=2/ #! 035/ @355 ,/ 8?/;@;3==/7 ,B .+=+
0;86 =2/ 7/A= #!
Rungs 2 and 3
#2/</ ;>71< 9;8?3./ 08; + ></;E373=3+=/.
,58-4 =;+7<0/; @;3=/ #& +0=/; =2/
68.>5/ 3< 373=3+53C/. += 98@/;E>9
;/<<371 =2/ 9><2,>==87 58-4< 8>= #!
89/;+=387 +7. 373=3+=/< + #& =2+=
;/-87031>;/< =2/ 68.>5/ 58-4 =;+7<0/;
@;3=/< @355 -87=37>/ 08; +< 5871 +< =2/
9><2,>==87 ;/6+37< -58</.
Rungs 4 and 5
#2/</ ;>71< 9;8?3./ + D;/+.E@;3=/E;/+.
</:>/7-/ =8 =2/ 68.>5/ += 98@/;E>9
#2/B +5<8 6+4/ <>;/ =2+= 875B 87/
,58-4 =;+7<0/; ;/+. 8; @;3=/ 3< /7+,5/.
.>;371 + 9+;=3->5+; 9;81;+6 <-+7
Rungs 6 and 7
#2/</ ;>71< +;/ =2/ -87.3=387371 ,58-4
=;+7<0/; ;>71< 7-5>./ +55 =2/ 379>=
-87.3=387371 <28@7 37 =2/ /A+695/
9;81;+6
#!
#&
PLCĆ2 Programming
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