Siemens SIMATIC S5 CP 523 Manual page 226

Using the "SEND" and "RECEIVE" Function Blocks
STL FB 201
0150 JUM1 :
0151 :L FW 242
0152 :ADD KF +6
0154 :L FW 234
0155 :!=F
0156 :JC =LWOR
0157 :
0158 :ADD KF +2
015A :T FW 234
015B :
015C :JU =NWOR
015D :
015E LWOR :L FW 242
015F :T FW 234
0160 :
0161 :L FW 238
0162 :L KB 0
0163 :><F
0164 :JC =NBLO
0165 :
0166 END :
0167 :
0168 :L FW 230
0169 :T =ZLAE
016A :
016B :L FY 254
016C :T =STAT
016D :
016E :***
Segment 7 0170
016F :BE
8-36
Explanations
Last word of the message block
read?
"Y E S"
Increment BADR index register by 2
and store
"N E X T W O R D"
Set module index register
to module base address
Last message block?
"N O" -> next message block
Output count register
Output status
CP 523
EWA 4NEB 811 6044-02a