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S5 to S7 Convertion

8/4/2011 12:46 PM	Rate (0)
Saravana kumar Gold Member Joined: 2/6/2009 Last visit: 9/1/2025 Posts: 940 Rating: (119)	HI, Can any one please explain the meaning of the below logic, if possible please write the equalent logic for LIR & TIR instruction in S7, FUNCTION FC 18 : VOID NAME: DW_TRANS // DW-TRANS VAR_INPUT QDBW :word; // QDBW ZDBW :word; // ZDBW ANZW :byte; // ANZW END_VAR VAR_TEMP conv_ret_val :int ; END_VAR BEGIN NETWORK L #ANZW SLW 1 T MW 254 L W#16#1 -I T MW 252 L #QDBW T MW 248 L MB 248 SLW 1 L DBW 414 +I // LIR 0; // * Error in Line 286 (FB 205): Command not defined. * L MB 249 SLW 1 +I L MW 252 +I T MW 250 L #ZDBW T MW 248 L MB 248 SLW 1 L DBW 414 +I // LIR 0; // * Error in Line 300 (FB 205): Command not defined. * L MB 249 SLW 1 +I L MW 252 +I T MW 252 L MW 250 L MW 252 //CALL SFC 20 ( // SRCBLK := P#????? BYTE 18 , // RET_VAL := conv_ret_val, // DSTBLK := P#????? BYTE 18 // ); // * Error in Line 314 (FB 205): CALL SFC20 generated. Please complete parameter list. *
	_______________________________________________________________ Best Regards T.Saravana Kumar "All for the Best"
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8/4/2011 7:02 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 9/2/2025 Posts: 12397 Rating: (2717)	Hello kumar; LITR and TIR (absolute addressing insructions of S5 PLCs) do not translate to S7 addressing; they must be reprogrammed when you get to the S7 program. There are many links to LIR/TIR conversion problems on the forum; here is one that I find helpful, particularly jklm's explanation: /tf/WW/en/Posts/45068 Hope this helps, Daniel Chartier

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