楼主：自己阅读一下语句理解一下吧，另外我抽了点时间帮你S5中的FB16转换成了S7的STL SOURCES程序，编译一下就是S7的FC16，再阅读S7的程序结合着理解一下，好运！

FUNCTION FC 16 : VOID
NAME: AE // READ IN ANALOG INPUT VALUES
VAR_INPUT
KANR :int; // KANR
ADR :int; // ADR
END_VAR
VAR_OUTPUT
WERT :word; // WERT
END_VAR
VAR_TEMP
conv_akku1 :dword;
conv_akku2 :dword;
conv_stw :word;
END_VAR
BEGIN
NETWORK
L #ADR;
L 6;
+I;
T MW 90;
L 1;
+I;
T MW 92;
L #KANR;

T conv_akku1;
TAK;
T conv_akku2;
L STW;
T conv_stw;
L MB 93;
SLW 3;
LAR1;
L conv_stw;
T STW;
L conv_akku2;
L conv_akku1;
T PQB [ AR1, P#0.0 ];

T conv_akku1;
TAK;
T conv_akku2;
L STW;
T conv_stw;
L MB 91;
SLW 3;
LAR1;
L conv_stw;
T STW;
L conv_akku2;
L conv_akku1;
T PQB [ AR1, P#0.0 ];
//;

T conv_akku1;
L STW;
T conv_stw;
L MB 91;
SLW 3;
LAR1;
L conv_stw;
T STW;
L conv_akku1;
L PIW [ AR1, P#0.0 ];
T MW 94;
AN M 94.7;
JC M001;
L MW 94;
L 2#0111111111111111;
AW;
SRW 4;
T #WERT;
JU M002;
M001:L MW 94;
SRW 4;
L 2#1111100000000000;
OW;
T #WERT;
M002:NOP 0;
END_FUNCTION